Synergistic herbicidal composition for broad spectrum weed control

Abstract

The present invention relates to a synergistic herbicidal composition for broad spectrum weed control in all stages of weed growth.

Description

[0001]FIELD OF THE INVENTION The present invention relates to a synergistic herbicidal composition for broad spectrum weed control in all stages of weed growth. More particularly, the present invention relates to a synergistic herbicidal composition comprising a) compound of Formula I, chemically known as [5-(difluoromethoxy)-1-methyl- 3-(trifluoromethyl)-1H-pyrazol-4-yl]methyl4,5-dihydro-5,5-dimethylisoxazol-3-yl-sulfone or its agrochemically acceptable salts, ester or derivatives; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives and c) compound of Formula II, chemically known as 2-{2-chloro-4-(methyl sulfonyl)-3-[(2,2,2 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives for broad spectrum weed control in all stages of weed growth. The present invention also relates to process for preparing the said composition and its use as herbicide. BACKGROUND OF THE INVENTION Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the present invention, or that any publication specifically or implicitly referenced is prior art. Weeds are undesirable plants that can severely damage yield in crops. Farmers usually control these plants at the pre-plant stage as well as after sowing. The weeds can reduce field crop yields by competing for water, sunlight and nutrients. Profitable crop production depends on effective weed control. Herbicides are pesticides useful for killing or controlling unwanted plants / weeds. The agriculture industry uses a wide range of herbicides, primarily to control undesired growth of weeds which interfere with growth, development, yield and quality of agricultural crops. More so, they are used to provide an optimum environment for growth and propagation of plant varieties. Modern herbicides are used to either control or suppress these undesirable plants so as to allow sown crops a greater share of nutrient. There are various prior arts which disclose compositions comprising combination of herbicides having Sulfentrazone, Carfentrazone combined with other herbicides. Some of such prior arts are listed below: CN104304258 discloses a mixed herbicide containing diflufenican and Sulfentrazone as active components and its preparation method and use. A mass ratio of diflufenican to Sulfentrazone in the mixed herbicide is 1-70: 1-20. The total mass of diflufenican and Sulfentrazone is 6-75% that of the mixed herbicide. CN112544625 discloses a Sulfentrazone-containing composition, which comprises effective components Sulfentrazone and halauxifen-methyl in a weight ratio of 24:72-1. CN105794820 discloses a mixed herbicide containing flazasulfuron, Carfentrazone-ethyl and flumetsulam as well as applications thereof. Flazasulfuron, Carfentrazone-ethyl and flumetsulam are used as main effective components, and the mass ratio of flazasulfuron, Carfentrazone-ethyl and flumetsulam is 0.1-80:0.1-80:0.1-80 for controlling controls of Gramineae weeds, Cyperaceae weeds and broad-leaf weeds in lawn have substantial effects. However, there still exists a scope for research and development of novel formulations, compositions for weed control, which are environmentally safe, cost-effective and which can be used for protection of crops during the critical periods of cultivation capable of acting both on the narrow-leaved and broad-leaved weeds, grasses and sedges and effective during all the stages of weed life cycle. The control of undesired vegetation is extremely important in achieving high crop efficiency. Achievement of selective control of the growth of weeds especially in such useful crops as rice, soybean, cotton, sugar beet, corn (maize), potato, wheat, barley, tomato and plantation crops such as sugarcane, among others, is very desirable. Unchecked weed growth in such useful crops can cause significant reduction in productivity and thereby result in increased costs to the consumer. The control of undesired vegetation in non-crop areas is also important. Many products are commercially available for these purposes, but the need continues for new products that are more effective, synergistic, less costly, less toxic, environmentally safer or have different modes of action and not resistant to weeds. More so, a wide range of herbicide compositions contain only a single active ingredient and cannot contain two or more active ingredients due to several reasons like adverse reactions, non-synergistic effects, non- compatibility of intermixed ingredients etc. However, the combinations currently known are not sufficient to control the resistant and persistent weeds. Growers, increasingly face complex weed situations that may not be controlled with just one herbicide. Further, a majority of the commercially available chemical herbicides are selective in their action. A common problem with selective herbicides is its weed control spectrum, meaning the range of weed species effectively controlled by the herbicide, does not cover the full diversity of weeds affecting the crop and are not broad spectrum in nature. It is therefore, a practice to apply two or more herbicides simultaneously in order to achieve maximum spectrum of control. But it requires a lot of human ingenuity and rigorous efforts to identify compatibility between the active ingredients and the specific ratios in which these components must be mixed so as to obtain the maximum desired results. However, a common problem with selective herbicides is its weed control spectrum, meaning the range of weed species effectively controlled by the herbicide, does not cover the full diversity of weeds affecting the crop and are not broad spectrum in nature. Combinations of herbicides are used to control a broader range of weeds. However, the combination of herbicides may not always result in the desired effect. Combination of herbicides may lead to an additive effect or an antagonistic effect. It may also result in phytotoxicity to the crops making it an undesirable combination. Agronomists must therefore, carefully select the herbicides that can be combined to offer a synergistic effect that would control weeds while having no phytotoxic effect on the crop, and reduce the chances of development of herbicide resistant weeds. Thus, there still remains a need for improved herbicidal combinations that can effectively control weeds thereby improving yield and plant health, with reduced phytotoxicity and have synergistic effect in terms of weed control. A compound of Formula I chemically known as [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone, is an isoxazoline herbicide having the effect of inhibiting cell division in plants. Being a pre- emergence herbicide, it acts by inhibition of the elongation steps of very-long chain fatty acid (VLCFA) synthesis. This compound is mainly used to control grass weeds and broadleaf weeds. This Formula I compound has been found useful for pre- emergence control of annual ryegrass, barley grass, annual phalaris, silver grass and toad rush and suppression of certain grass weeds in wheat, triticale and certain winter legume crops. Although the compound of Formula I is highly effective as pre-emergence herbicide, but, its activity at low application rates is not always satisfactory. Moreover, it shows poor or no post-emergence activity. Also, its compatibility with certain dicotyledonous crop plants such as cotton, sunflower, soybean, brassica crops such as canola and oilseed rape and some graminaceous plants such as rice, wheat, rye and barley is not always satisfactory. Apart from this, the use of compound of Formula I leads to damage the crop plants when controlling weed population. Another common problem with many commercially available herbicides is the narrow window of application. Most of them provide either a pre-emergence or a post-emergence weed control. An effective weed control can be achieved by usage of herbicides appropriately, which can be applied as an early post emergence to late post emergence (3-12 leaf stage of weeds). The activity of herbicides can be enhanced in various ways to achieve the maximum benefit. One of the ways is to use combinations. There is always a need in the art for improved herbicidal combinations with enhanced weed control efficacy, which are safe to crops and have no adverse effect on germination or growth of succeeding crops. Thus, there arises a need in the art to combine herbicides with varied modes of action, which allows for broader spectrum of control, targeted effect and good resistance management apart from good residual effect on succeeding crops using lower application rates. Unfortunately, it is usually not possible to predict synergistic activity for combinations of known herbicides, even if the compounds show a close structural similarity to known synergistic combinations. Accordingly, it is desirable to develop compositions and processes comprising combination of herbicides having different mode of action to give improved herbicidal bio-efficacy, broad-spectrum activity with better weed control, increased crop yield and reduced weed resistance and better crop safety by having targeted action on weeds and minimum damage to succeeding crops. OBJECTIVES OF THE INVENTION The main objective of the present invention is to provide synergistic herbicidal composition for broad spectrum weed control in all stages of weed growth, from pre- emergence, early post emergence to late post emergence weed stage, in single shot application. Another objective of the present invention is to provide a synergistic herbicidal composition effective for controlling undesired vegetation including weeds such as grassy weeds, broad leaved weeds, gramineous weeds and sedges in various crops. Yet another objective of the present invention is to provide a synergistic herbicidal composition which can be quickly absorbed by the treated leaves of the weeds. It is another objective of the present invention to provide a novel and effective synergistic herbicidal composition for controlling the harmful weeds in plants. It is another objective of the present invention to provide a novel and effective synergistic herbicidal composition which can be easily formulated. It is another objective of the present invention to provide a novel and effective synergistic herbicidal composition which is ideal for weed resistance management and provides enhanced weed control efficacy. Thus, an object of the present invention is to provide a novel and effective synergistic herbicidal composition and a method of controlling pre-emergence, early post emergence to late post emergence (3-12 leaf stage of weeds) weeds. Another objective of the present invention is to provide a novel and effective synergistic herbicidal composition for improved broadleaf and grassy weed control without adversely affecting desirable plants. Another objective of the present invention is to provide a novel and effective synergistic herbicidal composition which reduces the amount of chemical herbicidal agent necessary to obtain the acceptable weed control. It is another objective of the present invention to provide effective control against resistant weeds and helps to eliminate the chances of re-emergence or germination of weeds. It is another objective of the present invention to provide a novel and effective synergistic herbicidal composition which is ideal for weed resistance management and provides enhanced weed control efficacy and resist re-emergence of weeds. It is another objective of the present invention to provide a novel and effective synergistic composition which provides a better control of weeds at lower use rates, and excellent residual control. It is another objective of the present invention to provide a novel and effective synergistic composition which provide excellent crop safety in terms of no phytotoxicity and no adverse effect on germination or growth of succeeding crops. Yet another objective of the present invention is to provide a method of improving plant health and increasing crop yield by using synergistic herbicidal composition comprising a) compound of Formula I, chemically known as [5-(difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5- dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives and c) compound of Formula II , chemically known as 2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives. It is another objective of the present invention to provide a process for preparing a novel and effective synergistic herbicidal composition comprising a) Compound of Formula I , chemically known as [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5,5- dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives and c) compound of Formula II , chemically known as 2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives. Yet another objective of the present invention is to provide a method of increasing yield in a crop by application of a novel and effective synergistic herbicidal composition. Another objective of the present invention is to provide a novel and effective synergistic herbicidal composition which is more stable and has enhanced shelf life. Another objective of the present invention is to provide a novel and effective herbicidal composition which is synergistic and thus helps in resistance management. Another objective of the present invention is to provide one shot application of novel and effective synergistic herbicidal composition for killing / controlling highly resistant broad leaved weeds, grasses and sedges at lower application rates. It is another objective of the present invention to provide a novel and effective synergistic herbicidal composition which has enhanced efficacy and penetration capacity. Some or all these and other objective of the invention can be achieved by way of the invention described hereinafter. ADVANTAGES OF THE INVENTION 1. The synergistic herbicidal composition of the present invention provides weeds control in pre- emergence, early post emergence to late post emergence weed stage in single shot application. 2. The synergistic herbicidal composition of the present invention is stable and has enhanced shelf life. 3. The synergistic herbicidal composition of the present invention helps to delay, reduce and / or avoid the onset of herbicidal resistance or can be used on weeds already resistant to existing herbicides. 4. The synergistic herbicidal composition of the present invention provides broad spectrum control of weeds in a single shot application at lower use rates, and offers excellent residual control. 5. The synergistic herbicidal composition of the present invention provides excellent crop safety in terms of no phytotoxicity and has no adverse effect on germination or growth of succeeding crops. 6. The synergistic herbicidal composition of the present invention resulted in better unwanted plants control as compared to the binary combination, market standard and untreated check. 7. The synergistic herbicidal composition of the present invention is significantly superior from its individual product specifically manufactured by inventor or readily available in market in controlling of unwanted weeds in maize crop. 8. The synergistic herbicidal composition of the present invention provides higher grain yield and benefit cost ratio as compared to the control and binary and solo treatments applied in the maize crop. 9. The synergistic herbicidal composition shows no phytotoxicity effect on maize crop. 10. The synergistic herbicidal composition shows no residual effects on succeeding crop (Mustard). 11. The results of experiments indicate that the synergistic herbicidal composition is highly effective in controlling unwanted plants, safe to target crop and increasing production of grain yield and safe to at lower doses of the products in the combination, thus the invention will be cost effective and safer to the environment. SUMMARY OF THE INVENTION Accordingly, the present invention relates to a synergistic herbicidal composition comprising: a) Compound of Formula I , i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol-4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives and c) compound of Formula II i.e.2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives, for broad spectrum weed control in all stages of weed growth. In one embodiment of the present invention, the synergistic herbicidal composition comprises: a) Compound of Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol- 4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives; c) Compound of Formula II i.e. 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives; and d) One or more of agrochemically acceptable excipients. In another embodiment of the present invention, the synergistic herbicidal composition comprises: a) Compound of Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol-4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-15% by weight of the composition; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives, in the range of 10-50% by weight of the composition; c) Compound of Formula II i.e. 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-10% by weight of the composition. In yet another embodiment of the present invention, the synergistic herbicidal composition comprises: a) Compound of Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol-4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-15% by weight of the composition; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives, in the range of 10-50% by weight of the composition; c) Compound of Formula II i.e. 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-10% by weight of the composition and d) One or more of agrochemically acceptable excipients. In another embodiment of the present invention, the synergistic herbicidal composition comprises: a) Compound of Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol-4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-15% by weight of the composition; b) Sulfentrazone or its agrochemically acceptable salts, ester or derivatives in the range of 10-50% by weight of the composition; and c) Compound of Formula II i.e. 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives,, in the range of 0.1-10% by weight of the composition. In yet another embodiment of the present invention, the synergistic herbicidal composition comprises: a) Compound of Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol-4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-15% by weight of the composition; b) Carfentrazone or its agrochemically acceptable salts, ester or derivatives in the range of 10-50% by weight of the composition; and c) Compound of Formula II i.e. 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives,, in the range of 0.1-10% by weight of the composition. In another embodiment of the present invention, it is provided a process for preparation of the synergistic herbicidal composition comprising: a) Compound of Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-15% by weight of the composition; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives, in the range of 10-50% by weight of the composition; c) Compound of Formula II i.e. 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives, in the range of 0.1-10% by weight of the composition and d) One or more of agrochemically acceptable excipients. In one embodiment of the present invention, the present herbicidal composition is stable and has enhanced shelf life. Also provided herein are methods of controlling undesirable vegetation comprising contacting the vegetation or the locus thereof (i.e., area adjacent to the vegetation) with, or applying to the soil or water to prevent the emergence or growth of vegetation, bioactive amount of present herbicidal composition. In one another embodiment of the present invention, the present herbicidal composition can be applied to a plant / crop by spraying, rubbing, atomizing, irrigating, evaporating, dusting, fogging, broadcasting, pouring, mist blowing, soil mixing, foaming, painting, spreading-on, drenching, dipping or drip irrigation. etc. In yet another embodiment of the present invention, the present herbicidal composition can be formulated as one or more of Capsule suspension (CS), Dispersible concentrate (DC), Dustable powder (DP), Powder for dry seed treatment (DS), Emulsifiable concentrate (EC), Emulsifiable granule (EG), Emulsion water-in- oil (EO), Emulsifiable powder (EP), Emulsion for seed treatment (ES), Emulsion oil-in-water (EW), Flowable concentrate for seed treatment (FS), Granules (GR), Micro-emulsion (ME), Oil-dispersion (OD), Oil miscible flowable concentrate (OF), Oil miscible liquid (OL), Oil dispersible powder (OP), Suspension concentrate (SC), Suspension concentrate for direct application (SD), Suspo-emulsion (SE), Water soluble granule (SG), Soluble concentrate (SL), Spreading oil (SO), Water soluble powder (SP), Water soluble tablet (ST), Ultra-low volume (ULV) suspension, Tablet (TB), Ultra-low volume (ULV) liquid, Water dispersible granules (WDG), Wettable powder (WP), Water dispersible powder for slurry seed treatment (WS), Water dispersible tablet (WT), a mixed formulation of CS and SC (ZC) or a mixed formulation of CS and SE (ZE) and a mixed formulation of CS and EW (ZW). In one preferred embodiment of the present invention, the herbicidal composition is formulated as Water dispersible granule (WDG), Emulsifiable concentrate (EC), Suspension Concentrate (SC), Wettable powder(WP), Micro-emulsion (ME) or Soluble concentrate (SL). In further embodiment of the present invention, the herbicidal composition of the present invention further comprises one or more agrochemically acceptable excipients including but not limited to the group comprising surfactant / dispersing agent(s) [ionic / anionic / non-ionic], anti-freezing agent(s), emulsifier(s), co-emulsifier(s), safener(s), anti-foaming agent / defoamer(s), wetting agent(s), suspension aid(s), antimicrobial / anti-bacterial agent(s), thickening agent / thickener(s), quick coating agent(s) or sticking agents / sticker(s), spreader(s), binder(s), anti-caking agent(s), pH adjusting agent(s), adjuvant(s), filler(s), colorant(s), buffering agent(s), solvent(s), co-solvent(s) or a combination thereof. Additional components may also be included, e.g., protective colloids, adhesives, thixotropic agents, penetration agents, stabilisers, sequestering agents. More generally, the active materials can be combined with any solid or liquid carrier / additive, which complies with usual formulation techniques. The synergistic herbicidal composition of the present invention is effective against weed species including but not limited to Trianthema portulacastrum, Echinochloa sp., Bracheria sp, Acalypha sp., Commelina sp., Digera sp., Cyprus sp., Echinochloa sp., Brachiaria sp., Dinebra sp, Trianthema sp., Digera spp., Amaranlhus spp., Phyllanthus spp., Euphorbio spp., Dacteloctenium spp., Digitaria spp., Brachiaria spp., Echinocloa spp., Cynodon spp, Cyperus spp., Commelina benghalinsis, Acalypha indica, Corchorus spp., Euphorbia spp, Parthenium hysterophorus, Echinochloa colonum, Brachiaria spp., Dinebra spp., Cyperus rotundus. Amaranthus viridis, Trianthema spp., Digera arvensis, Physalis spp., Brachiaria spp., Cynodon dactylon, Echinochloa spp., Dactyloctenium, aegtptium, Cyperus rotundus, Echinochloa crusgalli, Eleusine indica, Phyllanthus niruri, Phalaris minor, Echinochloa colonum, Celosia argentia, Trianthema porulacastrum, Amarthanas viridis, Digeria arvensis, Phalaris minor, Echinochloa crusgalli, Eleusine indica, Phyllanthus niruri, Echinochloa colona, Celosia argentia, Trianthema portulacastrum, Amaranthus viridis, Digera arvensis. In yet another embodiment of the present invention, the present herbicidal composition can be applied to maize, cotton, wheat, soyabean, sugarcane, rice, ground nut, pulses including black gram, paddy and vegetables including but not limited to okra, tomato, sugar beet, egg-plants, lettuce, iceberg lettuce, pepper, cucumber, squash, melon, bean, dry-beans, peas, leek, garlic, onion, cabbage, carrot, cluster bean , tuber such as potato, sugar cane, tobacco, coffee, turf and forage, cruciferous, cucurbits, grapevines, tea, pepper, fodder beet, oil seed rape, pansy, impatiens, petunia, menthe, jute and geranium, etc. In another embodiment of the present invention, the present herbicidal composition can be applied to a plant / crop by spraying, rubbing, atomizing, irrigating, evaporating, dusting, fogging, broadcasting, pouring, mist blowing, soil mixing, foaming, painting, spreading-on, drenching, dipping or drip irrigation. etc. DETAILED DESCRIPTION OF THE INVENTION In describing the embodiments of the invention, specific terminology is resorted for sake of clarity. However, it is not intended that the invention be limited to specific terms so selected and it is to be understood that each specific term includes all technical equivalents that operate in a similar manner to accomplish a similar purpose. Discussed below are some representative embodiments of the present invention. The invention in its broader aspects is not limited to the specific details and representative methods. All technical and scientific terms used herein have the same meanings as commonly understood by someone ordinarily skilled in the art to which the present subject matter belongs. The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. Thus, for example, reference to a composition containing “a compound” includes a mixture of two or more compounds. It should also be noted that the term “or” is generally employed in its sense including “and / or” unless the content clearly dictates otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed. The expression of various quantities in terms of “% w / w” or “%” means the percentage by weight, relative to the weight of the total solution or composition unless otherwise specified. The term “control” as used in the present disclosure and claims, means to prevent the appearance of undesired vegetation or to reduce its growth or vigor. The term “active ingredient” (a.i.) or “active agent” used herein refers to that component of the composition responsible for control and killing of weeds. The terms “plants” and “vegetation” include, but are not limited to, germinant seeds, emerging seedlings, plants emerging from vegetative propagules, and established vegetation. The term “locus” as used herein shall denote the vicinity of a desired crop in which weed control, typically selective weed control, of weeds is desired. The locus includes the vicinity of desired crop plants wherein the weed infestation has either emerged or is yet to emerge. The term “crop” shall include a multitude of desired crop plants or an individual crop plant growing at a locus. The term “non-crop” areas shall include airport, railway stations, metro areas, between trees, horticulture areas, industrial areas, etc The term “synergistic”, as used herein, refers to the combined action of two or more active agents blended together and administered conjointly that is greater than the sum of their individual effects. “Bioactive amounts” as mentioned herein means that amount which, when applied for treatment of crops, is sufficient to give effect in such treatment. The term “herbicide” is used herein to mean an active ingredient that kills, controls or otherwise adversely modifies the growth of plants. An herbicidal effective or vegetation controlling amount is an amount of active ingredient which causes a “herbicidal effect,” i.e., an adversely modifying effect and includes deviations from natural development, killing, regulation, desiccation, retardation, and the like. The term "health of a plant" or "plant health" is defined as a condition of the plant and / or its products. As a result of the improved health; yield, plant vigor, quality and tolerance to abiotic or biotic stress is increased. Increased yield can be characterized, among others, by the following improved properties of the plant: increased plant weight, increased plant height, increased biomass such as higher overall fresh weight (FW), increased number of flowers per plant, higher grain yield, more tillers or side shoots (branches), larger leaves, increased shoot growth, increased protein content, increased oil content, increased starch content, increased pigment content, increased leaf are index. As per one embodiment, the active herbicidal compound as mentioned above to be used in the composition of the present invention, can be in the form of base or any salt form or ester form of the active which is known in the art. Variations or modifications to the composition of this invention, within the scope of the invention, may occur to those skilled in the art upon reviewing the disclosure herein. Such variations or modifications are well within the spirit of this invention. It has been observed by the inventors of the present invention that the composition of present invention not only enhances bio-efficacy and provides synergistic effect but also gives control of weeds for a longer duration as compared to solo and binary formulations of herbicides. In accordance with an embodiment of the present invention, there is provided a synergistic herbicidal composition comprising active ingredients present in the weight % range as given below: Compound of Formula I , i.e. At least one N- Compound of Formula II i.e.2-{2- chloro-4- [5- (difluoromethoxy)-1- phenyltriazolinone herbicide (methylsulfonyl)-3- [(2,2,2- methyl-3- (trifluoromethyl)- selected from trifluoroethoxy)methyl]benzoyl}cyclohexane- 1H-pyrazol-4- yl] methyl 4,5- Carfentrazone, 1,3-dione or its agrochemically acceptable dihydro-5,5- Sulfentrazone or its salts, ester or derivatives dimethylisoxazol-3-yl agrochemically acceptable sulfone or its agrochemically salts, ester or derivatives acceptable salts, ester or derivatives 0.1-15% 10-50% 0.1-10% The compound of Formula I is a selective pre-emergence grass and broad-leaved weed herbicide and has very low solubility in water. It has the chemical structure as below: Compound of Formula I In one embodiment of the present invention, the N-phenyltriazolinone herbicide in accordance with the present invention can be selected from Carfentrazone, Sulfentrazone. N- phenyltriazolinone herbicide targets the protoporphyrinogen oxidase enzyme. N- phenyltriazolinone herbicides are known for excellent pre-emergence weed control in various crops. The mode of action of N-phenyltriazolinone herbicide is the inhibition of protoporphyrinogen oxidase which causes the accumulation of protoporphyrin IX, which is involved in light dependent formation of singlet oxygen responsible for membrane peroxidation. In one embodiment of the present invention, Triketone herbicide in accordance with the present invention is Compound of Formula II. This compound acts by binding to and inhibiting hydroxylphenyl pyruvate dioxygenase (HPPD), leading to inhibition of carotene pigment synthesis. Compound of Formula II has the chemical structure as below: The herbicidal synergistic composition of present invention controls all kind of monocots, dicots, gramineous and sedges weeds. The most common weeds controlled are selected from but not limited to Abutilon indicum, Acalypha indica, Acanthospermum hispidum, Achyranthes aspera, Aerva tomentosa, Ageratum conyzoides, Alhagi camelorum, Amaranthus hybridus, Amaranthus spinosus, Amaranthus viridis, Ammannia baccifera, Anagallis arvensis, Argemone mexicana, Artemisia nilagiricia, Asphodelus tenuifolius, Avena fatua, Avena ludoviciana, Bidens pilosa, Boerhaavia diffusa, Boerhavia repanda, Brachiaria sp., Brachiaria mutica, Brassica kaber, Bromus tectorum, Calotropis gigantea, Cannabis sativa, Carthamus axyacantha, Cassia tora, Celosia argentea, Centella asiatica, Chenopodium album, Chenopodium murale, Chloris barbata, Chrozophora rottlerii, Cichorium intybus, Cirsium arvense, Clitoria ternatea, Cnicus arvensis, Commelina benghalensis, Commelina communis, Convolvulus arvensis, Conyza canadensis, Corchorus acutangulus, Coronopus didymus, Crotalaria serice, Sphenochlea sp, Cucumis callosus, Cuscuta campestris, Cuscuta chinensis, Cynodon dactylon, Cyanotis axillaris, Cyperus esculenthus, Cyperus iria, Cyperus rotundus, Ageratrum, Dactyloctenium aegyptium, Datura stramonium, Cyperous sp. Daucus carota, Digera arvensis, Digitaria sanguinalis, Dinebra retroflexa, Echinochloa sp, Echinochola colonum, Echinochola crusgalli, Eclipta alba, Eichhornia crassipes, Elephantopus scaber, Cynodan sp. , Cynodon dactylon (Dhoob grass), Paspalum conjugalum (Hilo grass) , Cyperus spp., (Purplenut shedge), Digeria aruensis (False Amaranth), Digiteria sanguinalis, Eleusine indica, Borreriabispida, Conyzoids, Digitaria ciliaris, Eragrostis major, Euphorbia geniculata, jugatum, Euphorbia hirta, Pospalumcon, Fimbristylis miliacea, Fumaria indica, Gynandropsis gynandra, Euphobia spp, Heliotropium indicum, Ludwigia , Indigofera glandulosa, Echinocloa crusgalli (barnyard grass), Pnicum isochmi, Ipomea aquatica, Lantana camara, Lathyrus aphaca (Meadow Pea), Launaea asplenifolia, Cyperus difformis , Cyperus iria , Launaea nudicaulis, Leucas aspera, Marsilea quadrifoliata, Medicago denticulate, Mimosa pudica, Melilotus alba, Melilotus indica, Melilotus spp (Sweet clover), Ocimum canum, Oenothera biennis, Opuntia dillenil, Orobanche ramosa, Oryza longistaminata, Oryza sativa, Oxalis corniculata, Oxalis latifolia, Parthenium hysterophorus, Paspalum sanguinale, Phalaris minor, Phyllanthus niruri, Physalis minima, Polypogon monspeliensis, Portulaca oleracea, Paspalum, Prosopis juliflora, Eragrostit minor, Dactyloctenium eigyptium, Rumex dentatus, Saccharum spontaneum, Stearia glauca, Seteria viridis, Eluesine indica , Sida spinosa, Silene antirrhina, Sisymbrium irio, Solanum nigrum, Solanum surattense, Sonchus oleraceous, Sorghum halepense, Spergula arvensis, Sphenocleazeylanica Gaertn, Grassy weeds Digitaria sanguinalis, Striga asiatica, Dactylocteneum, Tagetes minuta, Trianthema monogyna, Trianthema portulacastrum, Phalaris minor (Little seed canary grass) Tribulus terrestris, Trigonelia polycerata, Digiteria, Echinocloa colona (jungle rice), Chenopodium album (Lambs quarter), Setaria sp, parviflora , Vernonia cinerea, Fimbristlylis.Vicia, Coronpus, sativa, Borreria, Imperata, marginata, Rumes Sp. (Golden dock) and Xanthium strumarium. In an embodiment, the composition of present disclosure can be used to control all kind of monocots, dicots, sedges weed or any undesired or harmful plants. The composition can also control annual and perennial weeds. The composition in accordance with the present invention can be used to control harmful weeds that are hard to kill and have attained resistance. The composition in accordance with the present invention can be used to control wide array of weeds in non-cultivated areas, on paths, track systems, industrial areas ("industrial weed control") or the like. In some embodiments, the compositions and methods provided herein are utilized to control weeds in crops, including but not limited to direct-seeded, water-seeded and transplanted rice, wheat, barley, oats, rye, sorghum, soybean, green bean, garbanzo bean, corn / maize, cotton, pastures, grasslands, rangelands, fallow land, fallow-bed prior to planting crops, tree, vine and fruit orchards, including, but not limited to, citrus, grapes, almond, apple, apricot, avocado, beechnut, Brazil nut, butternut, cashew, cherry, chestnut, chinquapin, crab apple, date, feijoa, fig, filbert, hickory nut, kiwi, loquat, macadamia nut, may haws, nectarine, olives, peach, pear, pecan, persimmon, pistachio, plum, pomegranates, prune, quince, and walnut; mustard; vegetables (e.g., onions, onions grown for seed, shallots, garlic, peppers, tomatoes, artichokes and cole crops); fruiting crops (e.g., blueberries, guava, papaya, strawberries, taro, blackberries and raspberries); perennial crops, plantation crops (including, but not limited to, coffee, cacao, rubber and palm oil) and non- crop (including turf, forestry, aquatics, industrial vegetation management (IVM), deciduous trees, conifers (seedbeds, transplants, container stock and plantations / windbreaks), fencerows, parking areas, tank farm and storage areas, rights-of-way and utility areas. In an embodiment, the composition of the present invention may be used to control the target weeds among the field GMO (Genetically Modified Organism) and Non GMO varieties of including but not limited to, Soybean, Cotton (Gossypium spp.), Paddy (Oryza sativa), Wheat (Triticumaestavum), Barley (Hordeum vulgare), Maize (Zea mays), Sorghum (Sorghum bicolor), Oat (Avena sativa), Pearl millet, (Pennisetum glaucum),Sugarcane (Saccharum officinarum), Sugarbeet (Beta vulgaris), Soybean (Glycin max), Peanut (Arachis hypogaea), Sunflower (Helianthus annuus) , Mustard (Brassica juncea), Rape seed (Brassica napus), Linseed (Linumusitatissimum), Sesame (Sesamum indicum), Green gram (Vigna radiata), Black gram (Vigna mungo), Chickpea (Cicer aritinum), Cowpea (Vigna unguiculata), Redgram (Cajanus cajan), Frenchbean (Phaseolus vulgaris), Indian bean (Lablab purpureus), Horse gram (Macrotyloma uniflorum), Field pea (Pisum sativum), Cluster bean (Cyamopsis tetragonoloba), Lentils (Lens culinaris), Brinjal (Solanum melongena), Cabbage (Brassica oleracea var. capitata), Cauliflower (Brassica oleracea var. botrytis), Okra (Abelmoschus esculentus), Onion (Allium cepa L.),Tomato (Solanum lycopersicun) , Potato (Solanum tuberosum), Sweet potato (Ipomoea batatas), Chilly (Capsicum annum), Garlic (Allium sativum), Cucumber (Cucumis sativus), Muskmelons (Cucumis melo), Watermelon (Citrullus lanatus), Bottle gourd (Lagenaria siceraria), Bitter gourd (Momordica charantia), Radish (Raphanus sativus), Carrot (Dacus carota subsp. sativus), Turnip (Brassica rapasubsprapa), Apple (Melus domestica), Banana (Musa spp.), Citrus groups (Citrus spp.), Grape (Vitis vinifera), Guava (Psidium guajava), Litchi (Litchi chinensis), Mango (Mangifera indica), Papaya (Carica papaya), Pineapple (Ananas comosus), Pomegranate (Punica granatum) , Sapota (Manilkara zapota), Tea (Camellia sinensis), Coffea (Coffea Arabica), Turmeric (Curcuma longa), Ginger (Zingiber officinale), Cumin (Cuminum cyminum), Fenugreek (Trigonella foenum-graecum), Fennel (Foeniculum vulgare), Coriander(Coriandrum sativum), Ajwain (Trachyspermumammi), Psyllium (Plantago ovate), Black Pepper (Piper nigrum), Stevia (Stevia rebaudiana), Safed musli (Chlorophytum tuberosum), Drumstick (Moringa oleifera), Coconut (Coco nucifera), Mentha ( Mentha spp.), Rose (Rosa spp.), Jasmine (Jasminum spp.), Marigold (Tagetes spp.), Common daisy (Bellis perennis), Dahlia (Dahlia hortnesis), Gerbera (Gerbera jamesonii), Carnation (Dianthus caryophyllus), and the like. In an embodiment, the composition of the present invention can be used to delay, reduce and / or avoid the onset of herbicidal resistance. In one embodiment of the present invention, the present herbicidal composition controls various weeds in field crops, turf grass, horticulture & forestry, etc. In one embodiment of the present invention, the present herbicidal composition is stable and has enhanced shelf life. In one embodiment of the present invention, the present herbicidal composition has enhanced efficacy and penetration capacity. The composition of the present invention may also comprise safeners. In an embodiment, the composition of the present invention may be combined with at least another active ingredient such as those selected from but not limited to herbicide, insecticide, fungicide, biological agent, plant growth activator, fertilizers or combinations thereof. The content of the additives used in the present invention is not particularly limiting and may be determined by a skilled technician in the art according to the conventional protocols. The rate of application of composition of present invention varies depending on, for example, the blending ratio of active ingredients, meteorological condition, a dosage form, an application time, an application method, an application place, weed to be controlled, and a target crop, in ordinary cases. In a preferred embodiment of the present invention, N-phenyltriazolinone herbicide, is preferably Sulfentrazone. In still another preferred embodiment of the present invention, compound of Formula I, i.e. [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5,5- dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, is present in an amount of 8% by weight of the total composition. In still another preferred embodiment of the present invention, compound of Formula I, i.e. [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5,5- dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, is present in an amount of 10% by weight of the total composition. In still another preferred embodiment of the present invention, at least one N-phenyltriazolinone herbicide, selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives, is present in an amount of 36% by weight of the composition. In still another preferred embodiment of the present invention, N-phenyltriazolinone herbicide, is preferably Sulfentrazone and is present in an amount of 32% by weight of the composition. In still another preferred embodiment of the present invention, compound of Formula II i.e.2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts, ester or derivatives, is present in an amount of 6% by weight of the total composition. The composition of the present invention further also comprises safeners. In another preferred embodiment, the synergistic herbicidal composition of the present invention is applied in one shot application for killing / controlling highly resistant broad leaved weeds, grasses, gramineous weeds and sedges at lower application rates. In an embodiment, the synergistic herbicidal composition of the present invention may be formulated into formulation including a solid, liquid or semi-solid formulation. In an embodiment, the formulation may be selected from the group comprising of capsule suspension (CS), dispersible concentrate (DC), emulsifiable concentrate (EC), emulsion, water in oil (EO), emulsion, oil in water (EW), jambo balls or bags (bags in water soluble pouch), micro-emulsion (ME), oil dispersion (OD), oil miscible flowable concentrate (oil miscible suspension) (OF), oil miscible liquid (OL), suspension concentrate (SC), suspo- emulsion (SE), soluble concentrate (SL), water dispersible granule (WG or WDG), water soluble granule (SG), water soluble powder (SP), wettable powder (WP), a mixed formulation of CS and SC (ZC), a mixed formulation of CS and SE (ZE), a mixed formulation of CS and EW (ZW), granule (GR), soil applied granules (SAG), controlled release granules (CR), dusts, spray powders or the like. In yet one another more preferred embodiment the synergistic herbicidal composition of the present invention formulated as Water-dispersible granule (WG or WDG). In an embodiment, the present disclosure relates to a process of preparing the synergistic herbicidal composition of the present invention or formulation comprising the composition of the present invention. In another embodiment of the present invention, the synergistic herbicidal composition of the present invention further comprises one or more agrochemically acceptable excipients including but not limited to the group comprising surfactant(s), dispersing agent(s), wetting agent(s), anti-foaming agent / defoamer(s), anti-freezing agent(s), filler(s) / suspension aid(s), anti-caking agent(s), co-dispersant, antimicrobial / anti- bacterial agent(s), Carrier (s), biocide (s), emulsifier(s) (anionic and non-ionic), solvent(s) and co- solvent(s), polymer(s), or combinations thereof. In another embodiment of the present invention, the synergistic herbicidal composition of the present invention further comprises additional excipients including herein but not limited to thickening agent / thickener(s), quick coating agent(s) or sticking agents / sticker(s), spreader(s), binder(s), pH-adjusting agent(s), adjuvant(s),), colorant(s), buffering agent(s), polymer(s)rheology modifier(s), solvent(s), co- solvent(s) or a combination thereof. Additional components may also be included, e.g., protective colloids, adhesives, thixotropic agents, penetration agents, stabilisers, sequestering agents. More generally, the active materials can be combined with any solid or liquid carrier / additive, which complies with usual formulation techniques. Examples of surfactant / dispersing agent and co-dispersant used herein include but not limited to Sodium diisopropyl naphthlene sulphonate , Sodium Polycarboxylate, polymeric dispersant, polyarylphenyl ether phosphate, tristyryl phenol ethoxylate, acrylic graft copolymer, ethoxylated tristryl phenol Sulphate, alkyl naphthalene formaldehyde condensate, naphthalene sulfonic acid, sodium salt condensate with formaldehyde, ethoxylated oleyl cetyl alcohol, polyalkelene glycol ether, ethoxylated fatty alcohol, Sodium polymethyl methacrylate, sodium polyacrylate, sodium lignosulphonate, calcium lignosulphonate, alkylphenol polyoxyethylene ether, alcohol polyoxyethylene ether, alcohol polyglycol ether, , polymeric dispersants or mixtures thereof and present in the range of 0.1-20% by weight of the composition. Examples of wetting agent used herein include but not limited to tristyrylphenol ethoxylate non-ionic emulsifier, mixture of non-ionic surfactants, alkoxylated alcohol, block copolymer, alcohol polyglycol ether, alkyl olefin sulphates, dioctyl sulpho succinate, alkyl naphthalene sulphate , Sodium di-isopropyl naphthalene sulphonate, Polyalkoxy ethers, alkyl phenol ethoxylates, tri-styrenated phenol ethoxylate, EO / PO block co-polymers, sodium lauryl sulphate, sodium ligno sulphates or mixtures thereof and present in the range of 0.1-20% by weight of the total composition. Examples of defoamer or antifoaming agent used herein include but not limited to silicon emulsion based anti-foam agents, Siloxane polyalkyleneoxide, Polydimethylsiloxane, trisiloxane ethoxylates, silicone oil, silicone compound, C10～C20 saturated fat acid compounds or C8～C10 aliphatic alcohols compound, vegetable oil based antifoam, tallow based fatty acids, polyalkyleneoxide polydimethylsiloxane and mixtures thereof and present in the range of 0.1-10 % by weight of the composition. Examples of anti-freezing agent used herein include but not limited to glycol, propylene glycol, mono ethylene glycol, glycerine, diethylene glycol, sorbitol, urea, mannitol, polyethylene glycol or mixtures thereof and present in the range of 0.1-20% by weight of the composition. Examples of fillers used herein include but not limited to silicon dioxide, china-clay, kaolin, starch, bentonite, precipitated silica, fumed silica, talcum powder, lactose, ammonium sulphate, water, sodium sulphate, magnesium sulphate, sodium citrate, sodium chloride, potassium chloride and mixtures thereof and present in the range of 0.1-90 % by weight of the composition. Examples of anti-caking agent used herein include but not limited to group of talc, hydrous magnesium silicate, magnesium carbonate, calcium carbonate, precipitate silica, hydrophobic fumed silica and mixtures thereof and present in the range of 0.1-10% by weight of the composition. Examples of carrier used herein include but not limited to silicon dioxide, china clay, kaolin, starch, bentonite, precipitated silica, fumed silica, talcum powder, lactose, ammonium sulpha or mixture there of present in the range of 0.1-95 % by weight of the composition. Examples of biocide or anti-microbial agent used herein include but not limited to 1, 2,- Benzisothiazolin - 3-one, blends of 1,2,- benzisothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4- isothiazolin-3-one, blends of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, zinc 1-hydroxy-2(1H)-pyridinethione, blends of zinc l-hydroxy-2(1H)-pyridinethione and zinc oxide, and 2-n-octyl-4- isothiazolin-3-one or mixture thereof and present in the range of 0.1 to 10 % by weight of the composition. Examples of emulsifier(s) used herein include but not limited to araliphatic or aliphatic non-ionic emulsifier such as ethoxylated mono-, di- and trialkylphenols, ethoxylates of long-chain alcohols and polyethylene oxide / polypropylene oxide homo- and copolymers, EO / PO block copolymers. Ethoxylates of long-chain alkanols, ethoxylated monoalkylphenol, ethoxilates of cetyl alcohol and / or stearyl alcohol ; and Anionic emulsifier such as alkali metal and ammonium salts of alkyl sulfates, of hemisulfates of ethoxylated alkanols and ethoxylated alkylphenols, alkylsulfonic acids, bis(phenylsulfonic acid) ethers and their alkali metal or ammonium salts, sodiumlaurylsulfate, sodium (cetyl / stearyl) sulfate or mixture thereof and present in the range of 0.1 -20 % by weight of the composition. Examples of solvent(s) and co-solvent(s) used herein include but not limited to polar and non-polar solvent from the group comprising heavy aromatic hydrocarbon, N methyl pyrollidone, Solvent Naphtha (Solvent C-9), Di methyl sulfoxide, Dimethylformamide (DMF), N- alcohol, alkyl amide, vegetable oil, mineral oil, aromatic solvents, water or mixtures thereof and present in the range of 0.1 to 90 % by weight of the composition. Examples of polymer(s) used herein include but not limited to polyisocyanate used is toluene-2, 4- diisocyanate (TDI), diethylenetriamine (DETA),ethylene diamine (EDA), triethylenetetramine (TETA), and / or hexamethylene diamine (HMDA), diethanolglycine sodium salt, ethanoldiglycine disodium salt, hydroxymonocarboxylic acid compounds, hydroxydicarboxylic acid compounds, tetrasodium N,N- bis(carboxylatomethyl)-L-glutamate (GLDA), methylene diisocyanate (MDI), and / or low molecular weight polydiisocynates or mixture thereof and present in the range of 0.1- 10 % by weight of the composition. Examples of rheology modifier used herein include but not limited to xanthan gum, gum arabic, gun ghatti, gum karaya, gum tragacanth, guar gum, or locust bean gum; silica, silicon dioxide, attagel, agar, alginic acid or mixture thereof and present in the range of 0.1-10 % by weight of the composition. Examples of safener used herein include but not limited to such as AD-67 (MON 4660), benoxacor, benthicarb, brassinolide, cloquintocet (mexyl) cyometrinil, daimuron, dichlormid, dicyclonon, dimepiperate, disulfoton, fenchlorazole-ethyl, fenclorim, flurazole, fluxofenim, furilazole, harpin proteins, isoxadifen-ethyl, jiecaowan, jiecaoxi, mefenpyr-diethyl, mephenate, naphthalic anhydride (NA), oxabetrinil, R29148 and N-phenyl-sulfonylbenzoic acid amides or mixtures thereof and present in the range of 0.1-10 % by weight of the composition. The process for preparing the present novel synergistic herbicidal composition can be modified accordingly by any person skilled in the art based on the knowledge of the manufacturing the formulation. However, all such variation and modification is still covered by the scope of present invention. Thus, before describing the present invention in detail, it is to be understood that this invention is not limited to particularly exemplified systems or process parameters that may of course, vary. The use of examples anywhere in this specification including examples of any terms discussed herein is illustrative only, and in no way limits the scope and meaning of the invention or of any exemplified term. Likewise, the invention is not limited to various embodiments given in this specification. Representative examples of the present composition of this invention is provided below and is not to be construed as limiting in any manner: Sr. No Components of composition % w / w Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1. 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl 0.1-15% sulfone 2. N-phenyltriazolinone herbicide (Carfentrazone OR, Sulfentrazone) 10-50 % Formula II, i.e 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- 0.1-10 % trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione Dispersing agent / co-dispersant (Sodium diisopropyl naphthlene sulphonate , Sodium Polycarboxylate, polymeric dispersant, polyarylphenyl ether phosphate, tristyryl phenol ethoxylate, acrylic graft copolymer, ethoxylated tristryl phenol Sulphate, alkyl naphthalene formaldehyde condensate, naphthalene sulfonic acid, sodium salt condensate with formaldehyde, ethoxylated oleyl cetyl 0.1-20 % alcohol, polyalkelene glycol ether, ethoxylated fatty alcohol, Sodium polymethyl methacrylate, sodium polyacrylate, sodium lignosulphonate, calcium lignosulphonate, alkylphenol polyoxyethylene ether, alcohol polyoxyethylene ether, alcohol polyglycol ether, , polymeric dispersants) Wetting agent (tristyrylphenol ethoxylate non-ionic emulsifier, mixture of non-ionic surfactants, alkoxylated alcohol, block copolymer, alcohol polyglycol ether, alkyl olefin sulphates, dioctyl sulpho succinate, alkyl naphthalene sulphate , Sodium di-isopropyl 0.1-20 % naphthalene sulphonate, Polyalkoxy ethers, alkyl phenol ethoxylates, tri-styrenated phenol ethoxylate, EO / PO block co-polymers, sodium lauryl sulphate, sodium ligno sulphates) Defoamer or antifoaming agent (silicon emulsion based anti-foam agents, Siloxane polyalkyleneoxide, Polydimethylsiloxane, trisiloxane ethoxylates, silicone oil, silicone compound, C10～C20 saturated fat 0.1-10 % acid compounds or C8～C10 aliphatic alcohols compound, vegetable oil based antifoam, tallow based fatty acids, polyalkyleneoxide polydimethylsiloxane) Anti-freezing agent (glycol, propylene glycol, mono ethylene glycol, glycerine, diethylene glycol, sorbitol, urea, mannitol, polyethylene 0.1 -20 % glycol) Fillers (silicon dioxide, china-clay, kaolin, starch, bentonite, precipitated silica, fumed silica, talcum powder, lactose, ammonium 0.1-90 % sulphate, water, sodium Sulphate, magnesium sulphate, sodium citrate, sodium chloride, potassium chloride ) Anti-caking agent (talc, hydrous magnesium silicate, magnesium carbonate, calcium carbonate, precipitate silica, hydrophobic 0.1-10 % fumed silica) Carrier (s) (silicon dioxide, china clay, kaolin, starch, bentonite, precipitated silica, fumed silica, talcum powder, lactose, ammonium 0.1-95 % sulphate biocide or anti-microbial agent (1, 2,- Benzisothiazolin -3-one, blends of 1,2,- benzisothiazolin-3-one and 2-methyl-4-isothiazolin-3- one, 5-chloro-2-methyl-4-isothiazolin-3-one, blends of 5-chloro-2- 0.1-10 % methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, zinc 1-hydroxy-2(1H)-pyridinethione, blends of zinc l-hydroxy-2(1H)- pyridinethione and zinc oxide, and 2-n-octyl-4- isothiazolin-3-one. Emulsifier(s) (araliphatic or aliphatic non-ionic emulsifier such as ethoxylated mono-, di- and trialkylphenols, ethoxylates of long-chain alcohols and polyethylene oxide / polypropylene oxide homo- and copolymers, EO / PO block copolymers. Ethoxylates of long-chain alkanols, ethoxylated monoalkylphenol, ethoxilates of cetyl alcohol 0.1 -20 % and / or stearyl alcohol ; and Anionic emulsifier such as alkali metal and ammonium salts of alkyl sulfates, of hemisulfates of ethoxylated alkanols and ethoxylated alkylphenols, alkylsulfonic acids, bis(phenylsulfonic acid) ethers and their alkali metal or ammonium salts, sodiumlaurylsulfate, sodium (cetyl / stearyl) sulfate). Solvent(s) and co-solvent(s) (polar and non-polar solvent from the group comprising heavy aromatic hydrocarbon, N methyl pyrollidone, Solvent Naphtha (Solvent C-9), Di methyl sulfoxide, 0.1-90 % Dimethylformamide (DMF), N- alcohol, alkyl amide, vegetable oil, mineral oil, aromatic solvents, water . Polymer(s) (polyisocyanate used is toluene-2, 4-diisocyanate (TDI), diethylenetriamine (DETA),ethylene diamine (EDA), triethylenetetramine (TETA), and / or hexamethylene diamine 0.1- 10 % (HMDA), diethanolglycine sodium salt, ethanoldiglycine disodium salt, hydroxymonocarboxylic acid compounds, hydroxydicarboxylic acid compounds, tetrasodium N,N-bis(carboxylatomethyl)-L- glutamate (GLDA), methylene diisocyanate (MDI), and / or low molecular weight polydiisocynates). Rheology modifier (xanthan gum, gum arabic, gun ghatti, gum 15. karaya, gum tragacanth, guar gum, or locust bean gum; silica, silicon 0.1-10 % dioxide, attagel, agar, alginic acid) Safener (AD-67 (MON 4660), benoxacor, benthicarb, brassinolide, cloquintocet (mexyl) cyometrinil, daimuron, dichlormid, dicyclonon, dimepiperate, disulfoton, fenchlorazole-ethyl, fenclorim, flurazole, 16. 0.1-10 % fluxofenim, furilazole, harpin proteins, isoxadifen-ethyl, jiecaowan, jiecaoxi, mefenpyr-diethyl, mephenate, naphthalic anhydride (NA), oxabetrinil, R29148 and N-phenyl-sulfonylbenzoic acid amides) Example :1 Sr. No. Ingredients % W / W Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- 1 6.00 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) Technical Compound of Formula I [5-(difluoromethoxy)-1-methyl-3- 2 (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- 10.00 dimethylisoxazol-3-yl sulfone) Technical 3 Sulfentrazone Tech 32.00 4 Isoxadifen ethyl 3.00 5 Sodiumdiisopropyl naphthlene sulphonate 4.00 6 Sodium polycarboxylate 12.00 7 polymeric dispersant 2.00 8 Polydimethylsiloxane emulsion 1.00 9 Sodium Sulphate 5.00 10 China Clay QS TOTAL 100.0 Manufacturing Process: 1) Took china clay in to the ribbon blender and mixing was started. 2) To the above, Sodiumdiisopropyl naphthlene sulphonate, Sodium polycarboxylate, polymeric dispersant, Sodium Sulphate, Compound of formula I technical, Isoxadifen ethyl, Compound of formula II technical and Sulfentrazone technical were added and mixed thoroughly. 3) Above mixture was continued to mix till the material was completely homogenised. 4) Then the above mixture was passed through the Airjet mill at 6 to 7 kg / cm2of grinding pressure and 100 to 150 kg / hr feeding rate to get a particle size of D90 less than 10 microns. 5) The grinded material was collected in post blender. Extrusion process: Into the post blender the solution of water and Polydimethylsiloxane emulsion was added by means of spraying and dough was prepared. This dough was mixed well to get a well hydrated dough for extrusion. This dough was then allowed to pass through the screw valve fitted with post blender and then passed through basket extruder. Drying Process: 1. The wet extruded granules were then passed through VFBG (vibro fluid bed drier) which was brought to a consistent temperature of 50℃ prior to drying of wet granules. 2. These granules were checked for moisture content, which should not more than 3%. 3. Once the parameter was set then the process was continued. Sieving and packing: The dried granule was passed through vibro sieve machine to separate any lumps or dust and desired size granules were collected and packed. Evaluation of synergistic effect of herbicidal composition of the present invention A synergistic effect of two or more products exists whenever the action of an active ingredient combination is greater than the sum of the actions of the individual components. Synergism was calculated by using Colby’s method (Weeds, vol.15 No.1 (Jan 1967), pp.20-2. The synergistic action expected for a given combination of two active components can be calculated as follows: XY E = (X + Y) – --------- 100 The synergistic action expected for a given combination of three active components can be calculated as follows: (XY+YZ+XZ) (XYZ) E = (X + Y + Z) – ----------------- + ------------ 100 10000 Where: E represents expected percentage of pesticidal control for the combination of the two or three actives ingredients at defined doses (for example equal to x, y and z, respectively), X is the percentage of pesticidal control observed by the Compound of Formula II, i.e. (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) at a defined dose (equal to x), and Y is the percentage of pesticidal control observed by the Compound of Formula I, i.e. [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) at a defined dose (equal to y), Z is the percentage of pesticidal control observed by the compound (Sulfentrazone) at a defined dose (equal to z). When the percentage of pesticidal control observed for the combination is greater than the expected percentage, there is a synergism effect. Observed control (%) Ratio = ----------------------------- Expected control (%) Ratio of O / E > 1, synergism observed Evaluation of improved herbicidal composition of the present invention: Experiment for improved herbicidal composition of present invention: Example 1- Details of experiment on Maize crop: Field experiment for bio- activity of Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione), Compound of Formula I, [5-(difluoromethoxy)- 1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone on unwanted plants and grain yield in Maize crop was conducted at farmer field, Chhindwara (Madhya Pradesh). For Evaluate the synergistic effect, experimental field for experiment was ploughed and divided in plot size of 10 m x 10 m keeping 1 m buffer between plots to avoid drift of chemicals. maize seeds [Variety: Shaktiman] were sown in fields with row-to-row distance of 65 cm and plant to plant distance of 20 cm with three replications and in Randomized Block Design (RBD). The treatments were applied as single directed foliar spray @ 1000 ml / ha as pre-emergence herbicide at 3 days after sowing. The active components were applied in different ternary and binary combinations. Solo components were also taken for comparison. The treatment details are as under: Sr. No. Treatments Formulation Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione), T1 Compound of Formula I, [5-(difluoromethoxy)-1- 0.1% + 15% +10% methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5- dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione), T2 6% + 10% + 32% Compound of Formula I, [5-(difluoromethoxy)-1-methyl- 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 55,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione), T3 10% + 5% + 20% Compound of Formula I, [5-(difluoromethoxy)-1-methyl- 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 55,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione), T4 3% + 0.1% + 50% Compound of Formula I, [5-(difluoromethoxy)-1-methyl- 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 55,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone T5 Compound of Formula II, (2-{2-chloro-4- 0.1% + 15% (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) and Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5- dihydro-55,5-dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) T6 6% + 10% and Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5- dihydro-55,5-dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) T7 10% + 5% and Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5- dihydro-55,5-dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) T8 3% + 0.1% and Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5- dihydro-55,5-dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T9 0.1% +10% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T10 6% + 32% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- T11 (methylsulfonyl)-3-[(2,2,2- 10% + 20% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T12 3% + 50% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) and Sulfentrazone Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T13 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 15% +10% 55,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T14 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 10% + 32% 55,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T15 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 5% + 20% 55,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T16 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 0.1% + 50% 55,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- T17 (methylsulfonyl)-3-[(2,2,2- 0.1% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) Compound of Formula II, (2-{2-chloro-4- T18 (methylsulfonyl)-3-[(2,2,2- 6% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) Compound of Formula II, (2-{2-chloro-4- T19 (methylsulfonyl)-3-[(2,2,2- 10% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) Compound of Formula II, (2-{2-chloro-4- T20 (methylsulfonyl)-3-[(2,2,2- 3% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T21 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 15% 55,5-dimethylisoxazol-3-yl sulfone) Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T22 10% 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 55,5-dimethylisoxazol-3-yl sulfone) Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T23 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 5% 55,5-dimethylisoxazol-3-yl sulfone) Compound of Formula I, [5-(difluoromethoxy)-1-methyl- T24 3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro- 0.1% 55,5-dimethylisoxazol-3-yl sulfone) T25 Sulfentrazone 10% T26 Sulfentrazone 32% T27 Sulfentrazone 20% T28 Sulfentrazone 50% T29 Untreated check - The treatments T1 to T28 were applied as pre-emergence and in T29 control treatment only water was sprayed. Unwanted plants available in the field were Echinochloa sp. Bracheria sp, Eleusine indica, Phyllanthus niruri, Amaranthus viridis, Trianthema spp., Digera arvensis, Physalis spp., Cynodon dactylon, Dactyloctenium aegtptium, Cyperus rotundus etc. Post-treatment unwanted plant population was observed from 0.25 m2area replicated thrice per plot at 20 and 40 days after application for weed control efficacy. The per cent weeds control was calculated over control. Based on the per cent weeds control the Expected control was calculated and compared with Observed control. The results of the trial have been presented here under in Table 1. Table 1: Synergistic effect of combination product of the present invention (Compound of Formula II, i.e. (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) + Compound of Formula I, i.e. [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) + Sulfentrazone) against weeds on Maize crop. Colby Ratio Observed Expected Observed% Sr. Weed Weed Treatments Formulation WC / Expecte No. Control % Control % d % WC Mixed weeds population basis Compound of Formula II, (2-{2-chloro-4- 0.1% + 15% T1 (methylsulfonyl)-3-[(2,2,2- 81.67 45.746 1.785 +10% trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione), Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- 6% + 10% + dione), Compound of Formula I, [5- 90.33 56.426 1.601 32% (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- 10% + 5% + dione), Compound of Formula I, [5- 87.66 49.507 1.771 20% (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- 3% + 0.1% + dione), Compound of Formula I, [5- 70.08 40.011 1.752 50% (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) and Compound of Formula I, [5- 0.1% + 15% 18.33 32.470 0.565 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- 6% + 10% 23.48 38.342 0.612 dione) and Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- T7 dione) and Compound of Formula I, [5- 10% + 5% 18.08 30.201 0.599 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- T8 dione) and Compound of Formula I, [5- 3% + 0.1% 8.33 8.651 0.963 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T9 0.1% +10% 17.67 20.994 0.842 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T10 6% + 32% 31.42 38.044 0.826 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T11 10% + 20% 29.33 40.442 0.725 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T12 3% + 50% 25.66 39.203 0.655 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) and Sulfentrazone Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T13 15% +10% 31.33 44.831 0.699 methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone T14 Compound of Formula I, [5-(difluoromethoxy)-1- 10% + 32% 35.33 50.298 0.702 methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T15 5% + 20% 30.67 38.670 0.793 methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T16 0.1% + 50% 28.42 35.203 0.807 methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T17 0.1% 1.66 - - trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T18 6% 12.33 - - trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T19 10% 17.67 - - trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T20 3% 7.42 - - trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T21 15% 31.33 - - methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T22 10% 29.67 - - methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) Compound of Formula I, [5-(difluoromethoxy)-1- T23 5% 15.22 - - methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T24 0.1% 1.33 - - methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) T25 Sulfentrazone 10% 19.66 - - T26 Sulfentrazone 32% 29.33 - - T27 Sulfentrazone 20% 27.66 - - T28 Sulfentrazone 50% 34.33 - - T29 Untreated check - - - - It is clearly evident from the data shown in above Table 1 for per cent weeds control in maize crop that the ternary combination composition of the present invention comprising Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione), Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) and Sulfentrazone T1 to T4 are synergistic for weeds control with > 1 Colby’s Ratio. The binary combinations of two are compatible but no synergistic effect is shown for the control of weeds, but not effective for control of weeds. Experiment for Bio-efficacy evaluation of combination product of present invention: For the ternary and binary combination based on Compound of Formula II, Compound of Formula I, and Sulfentrazone evaluation under field conditions, the basic test composition as Compound of Formula II, 6% + Compound of Formula I, 10% + Sulfentrazone 32% WDG were manufactured specifically by the inventor. For trinary combination, Compound of Formula II 6% + Compound of Formula I, 10% + Sulfentrazone 32% WDG was used and for binary combination Compound of Formula II, 6% + Compound of Formula I, 10% WDG, Compound of Formula II, 6% + Sulfentrazone 32% WDG and Compound of Formula I, 10% + Sulfentrazone 32% WDG were used. The solo formulation of Compound of Formula II, 34.4% SC, Compound of Formula I, 85 % WG and Sulfentrazone 39.6% w / w SC available in the market were used for comparison. Example 2: Evaluation of the combination product of the present invention on Maize crop The synergistic composition of the present invention Compound of Formula II, 6% + Compound of Formula I, 10% + Sulfentrazone 32% WDG was evaluated on maize crop variety Shaktiman at a farmer field, Chhindwara, Madhya Pradesh. The applications were done 3 days after sowing following Randomized Block Design (RBD) with three replications maintaining a distance of 65 cm x 20 cm between plants and rows. The observations were recorded for the following objectives. Objectives: 1. To determine the efficacy of the improved herbicidal composition of the present invention against different unwanted plants available in the field in Maize crop. 2. To evaluate the impact of the improved herbicidal composition of the present invention on grain yield. 3. Phytotoxicity evaluation on maize crop 4. To evaluate the impact of the improved herbicidal composition of the present invention on residual effect on succeeding crop (Mustard). 5. Economics of treatments based on Cost: Benefit Ratio Treatments Details: Sr. No.TreatmentsCompound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of T1 Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG @ 850ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of T2 Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG @ 1000ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of T3 Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG @ 1250ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- T4 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% WDG @ 850ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of T5 Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% WDG @ 1000ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of T6 Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% WDG @ 1250ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- T7 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Sulfentrazone 32% % WDG @ 850ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- T8 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Sulfentrazone 32% % WDG @ 1000ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- T9 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Sulfentrazone 32% % WDG @ 1250ml / ha Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- T10 pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG @ 850ml / ha Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- T11 pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG @ 1000ml / ha Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- T12 pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG @ 1250ml / ha Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- T13 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 34.4% SC @ 286ml / ha Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- T14 pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 85 % WG @ 150g / ha T15 Sulfentrazone 39.6% w / w SC @ 750ml / ha T16 Hand weeding (Twice) T17 Untreated control Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T18 methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG @ 2500ml / ha (For phytotoxicity evaluation) Methodology: The treatments T1 to T15 and T18 were used as foliar application whereas no treatment was done for T16 Hand weeding (Twice) and T17 control treatment. The foliar applications were done 3 days after sowing of maize crop. Observation for number of weeds was recorded 20 days & 40 days after the treatments. The per cent weed control was calculated over control. The crop yield was recorded at crop harvest. Phytotoxicity to maize crop at 20 and 40 days after crop sowing were also recorded. Based on treatment application cost, market price of produce and net profit, the Cost: Benefit Ratio was calculated for the economics of ternary combination treatments. The observations for succeeding crop were recorded on mustard (Variety: PM 31). The data were subjected to statistically analysis of variance. Results are presented in Table 2, 3, 4 and 5. Results: Table 2: Field bio-efficacy evaluation of Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3- [(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG against weeds of maize crop. Sr. Treatments A.I. Dose Formulat Weed Control No. (g / ha) ion Efficacy (%) (ml / ha) 20 DAS 40 DAS Compound of Formula II, (2-{2-chloro-4- T1 (methylsulfonyl)-3-[(2,2,2- 51+ 85+ 272 850 79.66 83.33 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 6% + Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 6% + Compound of Formula I, [5- 60+ 100+ 1000 85.33 87.67 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 320 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 6% + Compound of Formula I, [5- 75+ 125+ 1250 88.18 90.21 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 400 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 6% + Compound of Formula I, [5- 51+ 85 850 48.66 51.33 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- 60+ 100 1000 50.48 53.67 dione) 6% + Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- T6 dione) 6% + Compound of Formula I, [5- 75+ 125 1250 51.33 55.48 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)- 1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T7 51+ 272 850 45.67 49.33 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T8 60+ 320 1000 49.08 52.67 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T9 75+ 400 1250 50.33 51.16 trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 6% + Sulfentrazone 32% % WDG Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T10 85+ 272 850 52.67 54.33 methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T11 100+ 320 1000 55.87 57.66 methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T12 125+ 400 1250 58.33 62.33 methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- T13 120 286 18.48 21.33 (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3- dione) 34.4% SC Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] T14 127.5 150 37.88 44.67 methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 85 % WG T15 Sulfentrazone 39.6% w / w SC 360 750 34.66 41.21 T16 Weed Free (Hand weeding) - - 94.63 96.66 T17 Untreated control - - - - DAS – Days after sowing Table 3: Field bio-efficacy evaluation of Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3- [(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5-5 (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG grain yield of maize crop. % Grain Sr. A.I. Dose Formulation Increase B:C Treatments Yield No. (g / ha) (ml or g / ha) against ratio (kg / ha) control Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of T1 Formula I, [5-(difluoromethoxy)-1- 51+ 85+ 272 850 3290 29.53 1:1.40 methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- 60+ 100+ T2 trifluoroethoxy)methyl]benzoyl}cyclohex 1000 3540 39.37 1:1.50 320 ane-1,3-dione) 6% + Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of 75+ 125+ Formula I, [5-(difluoromethoxy)-1- 1250 3740 47.24 1:1.56 400 methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of 51+ 85 850 2656 4.57 1:1.15 Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of 60+ 100 1000 2708 6.61 1:1.17 Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex 75+ 125 1250 2838 11.73 1:1.22 ane-1,3-dione) 6% + Compound of Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T7 trifluoroethoxy)methyl]benzoyl}cyclohex 51+ 272 850 2602 2.44 1:1.12 ane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T8 trifluoroethoxy)methyl]benzoyl}cyclohex 60+ 320 1000 2697 6.18 1:1.16 ane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T9 trifluoroethoxy)methyl]benzoyl}cyclohex 75+ 400 1250 2776 9.29 1:1.18 ane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl T10 85+ 272 850 2812 10.71 1:1.21 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl T11 100+ 320 1000 2933 15.47 1:1.26 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- T12 125+ 400 1250 2998 18.03 1:1.27 (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T13 120 286 2566 1.02 1:1.08 trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 34.4% SC Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- T14 (trifluoromethyl)-1H-pyrazol-4-yl] methyl 127.5 150 2787 7.28 1:1.16 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 85 % WG T15 Sulfentrazone 39.6% w / w SC 360 750 2702 6.38 1:1.07 T16 Weed Free (Hand weeding) - - 3949 55.47 1:1.29 T17 Untreated control - - 2540 - - S. Em. ± 312.3 - C.D at 5 % 998.1 - Table 4: Phytotoxicity evaluation of Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3- [(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- 5 dimethylisoxazol-3-yl sulfone) 10%+ Sulfentrazone 32% % WDG on maize crop. Sr. Treatments A.I. Dose Formul Phytotoxicity parameters No. (g / ha) ation observed*(mean data recorded at (ml or 20 and 40 days after crop sowing) g / ha) L W N V E H Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of T1 51+ 85+ 272 850 0 0 0 0 0 0 Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of 60+ 100+ Formula I, [5-(difluoromethoxy)-1- 1000 0 0 0 0 0 0 320 methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of 75+ 125+ Formula I, [5-(difluoromethoxy)-1- 1250 0 0 0 0 0 0 400 methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of 51+ 85 850 0 0 0 0 0 0 Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of 60+ 100 1000 0 0 0 0 0 0 Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of T6 75+ 125 1250 0 0 0 0 0 0 Formula I, [5-(difluoromethoxy)-1- methyl-3-(trifluoromethyl)-1H-pyrazol-4- yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T7 trifluoroethoxy)methyl]benzoyl}cyclohex 51+ 272 850 0 0 0 0 0 0 ane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T8 trifluoroethoxy)methyl]benzoyl}cyclohex 60+ 320 1000 0 0 0 0 0 0 ane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T9 trifluoroethoxy)methyl]benzoyl}cyclohex 75+ 400 1250 0 0 0 0 0 0 ane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl T10 85+ 272 850 0 0 0 0 0 0 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- T11 100+ 320 1000 0 0 0 0 0 0 (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl T12 125+ 400 1250 0 0 0 0 0 0 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- T13 120 286 0 0 0 0 0 0 trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 34.4% SC Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- T14 (trifluoromethyl)-1H-pyrazol-4-yl] methyl 127.5 150 0 0 0 0 0 0 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 85 % WG T15 Sulfentrazone 39.6% w / w SC 360 750 0 0 0 0 0 0 T16 Weed Free (Hand weeding) - - 0 0 0 0 0 0 T17 Untreated control - - 0 0 0 0 0 0 Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohex ane-1,3-dione) 6% + Compound of Formula I, [5-(difluoromethoxy)-1- 120+200+6 T18 2000 0 0 0 0 0 0 methyl-3-(trifluoromethyl)-1H-pyrazol-4- 40 yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG (For phytotoxicity evaluation) L – Leaf injury on tips / surface, W – Wilting, N – Necrosis, V – Vein clearing, E – Epinasty, H – Hyponasty *Based on 0-10 scale where: 0=0%, 1=1-10%, 2=11-20%, 3=21-30%, 4=31-40%, 5=41-50%, 6=51-60%, 7=61- 70%, 8=71-80%, 9=81-90%,10=91-100% From the example, it can be clearly seen that the combination of the present invention is superior for controlling the weeds at 20 and 40 days after sowing in maize crop as compared to the binary composition and solo component other registered formulated products available in the market comprising at different dosage levels (Table 2). The yield of maize crop also improved in the ternary combination of Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane- 1,3-dione) 6% + Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H- pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% WDG as compared to binary and solo components (Table 3). The Cost: Benefit Ratio revealed that ternary combination Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% WDG @ 1000 ml / ha were most economical with higher Cost: Benefit Ratio as compared to other binary and solo treatments (Table 3). The disclosed combination Compound of Formula II, (2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% WDG @ 850, 1000, 1250 and 2000 ml / ha further showed no phytotoxicity in the maize crop even after 20 and 40 days after treatment application (Table 4). Study of the residual effect on the succeeding crop: The impact of the above treatments on the succeeding crop of mustard (variety: PM 31) was also studied in the following season after the harvest of maize crop and per cent germination, plant hight and phyto-toxicity effects were studied and evaluated. It was found that the germination of mustard crop was unaffected in treated as compared to the control plots and no phyto-toxicity symptoms observed. Table 5: Effect of improved herbicidal composition of Compound of Formula II, (2-{2-chloro-4- (methylsulfonyl)-3-[(2,2,2-trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione) 6% + Compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG on residual effect in succeeding crop (Mustard). Sr. Treatments A.I. Dose Formul Per Plant height Phyto- No. (g / ha) ation cent (cm) toxicity* (ml or crop 30 60 30 60 g / ha) germin DAS DAS DA DAS a-tion S Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- trifluoroethoxy)methyl]benzoyl}cy clohexane-1,3-dione) 6% + 86.86 Compound of Formula I, [5- 51+ 85+ 272 850 15.10 69.40 0 0 (68.71) (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- trifluoroethoxy)methyl]benzoyl}cy clohexane-1,3-dione) 6% + 60+ 100+ 90.65 Compound of Formula I, [5- 1000 14.90 68.80 0 0 320 (72.20) (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- trifluoroethoxy)methyl]benzoyl}cy 75+ 125+ 90.61 clohexane-1,3-dione) 6% + 1250 14.70 67.70 0 0 400 (72.16) Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- trifluoroethoxy)methyl]benzoyl}cy clohexane-1,3-dione) 6% + 88.63 Compound of Formula I, [5- 51+ 85 850 12.35 62.05 0 0 (70.30) (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- trifluoroethoxy)methyl]benzoyl}cy clohexane-1,3-dione) 6% + 87.95 Compound of Formula I, [5- 60+ 10 1000 12.05 61.30 0 0 (69.69) (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- trifluoroethoxy)methyl]benzoyl}cy clohexane-1,3-dione) 6% + 86.70 75+ 125 1250 11.90 60.25 0 0 Compound of Formula I, [5- (68.61) (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- 87.75 T7 51+ 272 850 13.30 63.10 0 0 trifluoroethoxy)methyl]benzoyl}cy (69.52) clohexane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- 86.83 T8 60+ 320 1000 13.50 64.50 0 0 trifluoroethoxy)methyl]benzoyl}cy (68.71) clohexane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- [(2,2,2- 85.18 T9 75+ 400 1250 13.05 62.75 0 0 trifluoroethoxy)methyl]benzoyl}cy (67.42) clohexane-1,3-dione) 6% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] 88.15 T10 85+ 272 850 13.40 64.20 0 0 methyl 4,5-dihydro-5 5,5- (69.87) dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] 87.95 T11 100+ 320 1000 13.20 63.00 0 0 methyl 4,5-dihydro-5 5,5- (69.69) dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula I, [5- 86.86 T12 (difluoromethoxy)-1-methyl-3- 125+ 400 1250 12.95 61.80 0 0 (68.71) (trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5- dimethylisoxazol-3-yl sulfone) 10% + Sulfentrazone 32% % WDG Compound of Formula II, (2-{2- chloro-4-(methylsulfonyl)-3- 85.54 T13 [(2,2,2- 120 286 13.55 64.35 0 0 (67.65) trifluoroethoxy)methyl]benzoyl}cy clohexane-1,3-dione) 34.4% SC Compound of Formula I, [5- (difluoromethoxy)-1-methyl-3- (trifluoromethyl)-1H-pyrazol-4-yl] 85.33 T14 127.5 150 13.65 64.65 0 0 methyl 4,5-dihydro-5 5,5- (67.51) dimethylisoxazol-3-yl sulfone) 85 % WG 87.75 T15 Sulfentrazone 39.6% w / w SC 360 750 13.70 65.05 0 0 (69.52) 94.72 T16 Weed Free (Hand weeding) - - 15.20 70.10 0 0 (76.71) 85.15 T17 Untreated control - - 10.45 59.44 0 0 (67.68) S Em ± 0.68 0.09 0.11 - - CD (P=0.05) 1.89 0.29 0.32 - - L – Leaf injury on tips / surface, W – Wilting, N – Necrosis, V – Vein clearing, E – Epinasty, H – Hyponasty *Based on 0-10 scale where: 0=0%, 1=1-10%, 2=11-20%, 3=21-30%, 4=31-40%, 5=41-50%, 6=51-60%, 7=61- 70%, 8=71-80%, 9=81-90%,10=91-100% It was seen that the synergistic herbicidal composition of the present invention provided excellent & effective control of unwanted plants available in the field without any phytotoxicity symptoms on Maize crop. From the above investigations, it will be observed that numerous modifications and variations can be effectuated without departing from the true spirit and scope of the novel concepts of the present invention. It is to be understood that no limitations with respect to the specific embodiments illustrated is intended or should be inferred. It should be understood that all such modifications and improvements have been deleted herein for the sake of conciseness and readability but are properly within the scope of the following claims. Dated this 29thday of June, 2024 Dr. Shilpa Arora IN / PA-1238 Patent Agent for the Applicant To The Controller of Patents The Patent Office At New Delhi

Claims

I Claim

1. A synergistic herbicidal composition comprising: a) a compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives; c) a compound of Formula II, chemically known as 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts.

2. A synergistic herbicidal composition as claimed in claim 1, comprising: a) a compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-55,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives, present in the range of 0.1-15% by weight of the composition; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives, present in the range of 10-50% by weight of the composition; c) a compound of Formula II, chemically known as 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts derivatives, present in the range of 0.1-10% by weight of the composition.

3. The herbicidal composition as claimed in claims 1 to 2, which further comprises one or more agrochemically acceptable excipients.

4. The herbicidal composition as claimed in claims 1 to 3, wherein one or more agrochemically acceptable excipients is selected from the group comprising of surfactant(s), dispersing agent(s), wetting agent(s), anti-foaming agent / defoamer(s), anti-freezing agent(s), filler(s) / suspension aid(s), anti-caking agent(s), co- dispersant, antimicrobial / anti-bacterial agent(s), carrier (s), biocide (s), emulsifier(s) (anionic and non- ionic), solvent(s) and co-solvent(s), polymer(s), rheology modifier or combinations thereof.

5. . The synergistic herbicidal composition as claimed in claim 4 wherein the surfactant / dispersing agent and co-dispersant is selected from the group comprising of Sodium diisopropyl naphthlene sulphonate , Sodium Polycarboxylate, polymeric dispersant, polyarylphenyl ether phosphate, tristyryl phenol ethoxylate, acrylic graft copolymer, ethoxylated tristryl phenol Sulphate, alkyl naphthalene formaldehyde condensate, naphthalene sulfonic acid, sodium salt condensate with formaldehyde, ethoxylated oleyl cetyl alcohol, polyalkelene glycol ether, ethoxylated fatty alcohol, Sodium polymethyl methacrylate, sodium polyacrylate, sodium lignosulphonate, calcium lignosulphonate, alkylphenol polyoxyethylene ether, alcohol polyoxyethylene ether, alcohol polyglycol ether, polymeric dispersants or mixtures thereof and present in the range of 0.1-20% by weight of the composition.

6. The synergistic herbicidal composition as claimed in claim 4, wherein, the wetting agent is selected from the group comprising of tristyrylphenol ethoxylate non-ionic emulsifier, mixture of non-ionic surfactants, alkoxylated alcohol, block copolymer, alcohol polyglycol ether, alkyl olefin sulphates, dioctyl sulpho succinate, alkyl naphthalene sulphate , Sodium di-isopropyl naphthalene sulphonate, Polyalkoxy ethers, alkyl phenol ethoxylates, tri-styrenated phenol ethoxylate, EO / PO block co- polymers, sodium lauryl sulphate, sodium ligno sulphates or mixtures thereof and present in the range of 0.1-20% by weight of the total composition.

7. The synergistic herbicidal composition as claimed in claim 4, wherein, the defoamer or antifoaming agent is selected from the group comprising of silicon emulsion based anti-foam agents, Siloxane polyalkyleneoxide, Polydimethylsiloxane, trisiloxane ethoxylates, silicone oil, silicone compound, C10 ～C20 saturated fat acid compounds or C8～C10 aliphatic alcohols compound, vegetable oil based antifoam, tallow based fatty acids, polyalkyleneoxide polydimethylsiloxane and mixtures thereof and present in the range of 0.1-10 % by weight of the composition.

8. The synergistic herbicidal composition as claimed in claim 4, wherein, the anti-freezing agent is selectedfrom the group comprising of glycol, propylene glycol, mono ethylene glycol, glycerine, diethylene glycol, sorbitol, urea, mannitol, polyethylene glycol or mixtures thereof and present in the range of 0.1- 20% by weight of the composition.

9. The synergistic herbicidal composition as claimed in claim 4, wherein, the fillers is selected from the group comprising of silicon dioxide, china-clay, kaolin, starch, bentonite, precipitated silica, fumed silica, talcum powder, lactose, ammonium sulphate, water, sodium sulphate, magnesium sulphate, sodium citrate, sodium chloride, potassium chloride and mixtures thereof and present in the range of 0.1-90 % by weight of the composition.

10. The synergistic herbicidal composition as claimed in claim 4, wherein, the anti-caking agent is selected from the group comprising of talc, hydrous magnesium silicate, magnesium carbonate, calcium carbonate, precipitate silica, hydrophobic fumed silica and mixtures thereof and present in the range of 0.1-10% by weight of the composition.

11. The synergistic herbicidal composition as claimed in claim 4, wherein, the carrier (s) is selected from the group comprising of silicon dioxide, china clay, kaolin, starch, bentonite, precipitated silica, fumed silica, talcum powder, lactose, ammonium sulpha or mixture there of present in the range of 0.1-95 % by weight of the composition.

12. The synergistic herbicidal composition as claimed in claim 4, wherein, the biocide or anti-microbial agent used herein include but not limited to 1, 2,- Benzisothiazolin -3-one, blends of 1,2,- benzisothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, 5-chloro-2-methyl-4-isothiazolin-3-one, blends of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, zinc 1-hydroxy- 2(1H)-pyridinethione, blends of zinc l-hydroxy-2(1H)-pyridinethione and zinc oxide, and 2-n-octyl-4- isothiazolin-3-one or mixture thereof and present in the range of 0.1 to 10 % by weight of the composition.

13. The synergistic herbicidal composition as claimed in claim 4, wherein, the emulsifier(s) is selected fromthe group comprising of araliphatic or aliphatic non-ionic emulsifier such as ethoxylated mono-, di- and trialkylphenols, ethoxylates of long-chain alcohols and polyethylene oxide / polypropylene oxide homo- and copolymers, EO / PO block copolymers. Ethoxylates of long-chain alkanols, ethoxylated monoalkylphenol, ethoxilates of cetyl alcohol and / or stearyl alcohol ; and Anionic emulsifier such as alkali metal and ammonium salts of alkyl sulfates, of hemisulfates of ethoxylated alkanols and ethoxylated alkylphenols, alkylsulfonic acids, bis(phenylsulfonic acid) ethers and their alkali metal or ammonium salts, sodiumlaurylsulfate, sodium (cetyl / stearyl) sulfate or mixture thereof and present in the range of 0.1 -20 % by weight of the composition.

14. The synergistic herbicidal composition as claimed in claim 4, wherein, the solvent(s) and co-solvent(s) is selected from the group comprising of polar and non-polar solvent from the group comprising heavy aromatic hydrocarbon, N methyl pyrollidone, Solvent Naphtha (Solvent C-9), Di methyl sulfoxide, Dimethylformamide (DMF), N- alcohol, alkyl amide, vegetable oil, mineral oil, aromatic solvents, water or mixtures thereof and present in the range of 0.1 to 90 % by weight of the composition.

15. The synergistic herbicidal composition as claimed in claim 4, wherein, the polymer(s) is selected from the group comprising of polyisocyanate used is toluene-2, 4-diisocyanate (TDI), diethylenetriamine (DETA),ethylene diamine (EDA), triethylenetetramine (TETA), and / or hexamethylene diamine (HMDA), diethanolglycine sodium salt, ethanoldiglycine disodium salt, hydroxymonocarboxylic acid compounds, hydroxydicarboxylic acid compounds, tetrasodium N,N-bis(carboxylatomethyl)-L- glutamate (GLDA), methylene diisocyanate (MDI), and / or low molecular weight polydiisocynates present in the range of 0.1- 10 % by weight of the composition.

16. The synergistic herbicidal composition as claimed in claim 4, wherein, the rheology modifier is selected from the group comprising of xanthan gum, gum arabic, gun ghatti, gum karaya, gum tragacanth, guar gum, or locust bean gum; silica, silicon dioxide, attagel, agar, alginic acid or mixture thereof and present in the range of 0.1-10 % by weight of the composition.

17. The synergistic herbicidal composition as claimed in claim 4, wherein, the safener is selected from the group comprising of AD-67 (MON 4660), benoxacor, benthicarb, brassinolide, cloquintocet (mexyl)cyometrinil, daimuron, dichlormid, dicyclonon, dimepiperate, disulfoton, fenchlorazole-ethyl, fenclorim, flurazole, fluxofenim, furilazole, harpin proteins, isoxadifen-ethyl, jiecaowan, jiecaoxi, mefenpyr-diethyl, mephenate, naphthalic anhydride (NA), oxabetrinil, R29148 and N-phenyl- sulfonylbenzoic acid amides or mixtures thereof and present in the range of 0.1-10 % by weight of the composition.

18. The synergistic herbicidal composition as claimed in claims 1 to 17, wherein the use of said composition promotes plant health, growth and thus increases plant, crop yield in the field.

19. The synergistic herbicidal composition as claimed in claims 1 to 18, provide one shot application of novel and effective synergistic herbicidal composition for killing / controlling narrow-leaved and broad- leaved weeds, grasses and sedges.

20. The synergistic herbicidal composition as claimed in any one of the claims 1 to 19, wherein the composition is in form of Capsule suspension (CS), Dispersible concentrate (DC), Dustable powder (DP), Powder for dry seed treatment (DS), Emulsifiable concentrate (EC), Emulsifiable granule (EG), Emulsion water-in-oil (EO), Emulsifiable powder (EP), Emulsion for seed treatment (ES), Emulsion oil-in-water (EW), Flowable concentrate for seed treatment (FS), Granules (GR), Micro-emulsion (ME), Oil-dispersion (OD), Oil miscible flowable concentrate (OF), Oil miscible liquid (OL), Oil dispersible powder (OP), Suspension concentrate (SC), Suspension concentrate for direct application (SD), Suspo- emulsion (SE), Water soluble granule (SG), Soluble concentrate (SL), Spreading oil (SO), Water soluble powder (SP), Water soluble tablet (ST), Ultra-low volume (ULV) suspension, Tablet (TB), Ultra-low volume (ULV) liquid, Water dispersible granules (WG or WDG), Wettable powder (WP), Water dispersible powder for slurry seed treatment (WS), Water dispersible tablet (WT), a mixed composition of CS and SC (ZC), a mixed composition of CS and SE (ZE) or a mixed composition of CS and EW (ZW).

21. A water-dispersible granular synergistic herbicidal composition comprising:a) a compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives present in the range of 0.1-15% by weight of the composition; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives present in the range of 10-50% by weight of the composition; c) a compound of Formula II, chemically known as 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts derivatives present in the range of 0.1-10% by weight of the composition.

22. A kit-of-parts comprising a plurality of components, wherein said plurality of components comprises: a) a compound of Formula I, [5-(difluoromethoxy)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl] methyl 4,5-dihydro-5 5,5-dimethylisoxazol-3-yl sulfone or its agrochemically acceptable salts, ester or derivatives; b) at least one N-phenyltriazolinone herbicide selected from Carfentrazone, Sulfentrazone or its agrochemically acceptable salts, ester or derivatives; c) a compound of Formula II, chemically known as 2-{2-chloro-4-(methylsulfonyl)-3-[(2,2,2- trifluoroethoxy)methyl]benzoyl}cyclohexane-1,3-dione or its agrochemically acceptable salts. Dated this 29thday of June, 2024 Dr. Shilpa Arora IN / PA-1238 Patent Agent for the Applicant To The Controller of Patents The Patent Office At New Delhi

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