The stable synergistic herbicidal composition comprising oxadiazon, bensulfuron-methyl and pretilachlor or butachlor

Abstract

The present invention relates to a stable synergistic herbicidal composition for synergistic and effective control of various weeds. The present invention also relates to process for preparing the said composition and its use as herbicide.

Description

[0001] STABLE SYNERGISTIC HERBICIDAL COMPOSITION

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to a stable synergistic herbicidal composition comprising A) a compound of Formula I, i.e., 5 -tert-butyl-3 -(2, 4-dichloro-5 -isopropoxyphenyl)-!, 3, 4-oxadiazol-2(3H)-one or its agrochemically acceptable salts, isomers, esters and derivatives; B) a compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl] methyl]benzoate or its agrochemically acceptable salts, isomers, esters and derivatives; and C) at least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, isomers, esters or its derivatives for effective control of various weeds. The present invention also relates to a process for preparation of such herbicidal composition for synergistic and efficacious control of various weeds.

[0004] BACKGROUND OF THE INVENTION

[0005] In the field of agriculture and crop management activities, there have been numerous issues that can impact the crop productivity and yield. However, among all the challenges to the crop yield the highest cause for crop loss occurs in the form of weeds. The undesired vegetations alongside the crops have been a persistent issue to overcome.

[0006] Therefore, there is a high need to protect the crops from weeds and other vegetations that grow alongside the crop and affect the growth of the crops, resulting in stunted or unsatisfactory growth of crops and other various forms of allelopathic effects exerted on desired plant or crop species due to presence of the weeds in their vicinity. At least for this reason, weed and undesirable plant management is crucial to crop productivity from an economic standpoint and to achieve the crop yield to its best potential. Scholars working in the field of artificial chemistry have created a wide range of chemicals and chemical formulations that can be used alone or in conjunction with other active components to control weeds and undesired plants.

[0007] In present times, small seed canary grass, which is resistant to the majority of existing herbicidal management techniques, has been a severe problem for wheat crops in India. Mixtures of several active chemicals are now used to manage weeds and undesired plants in order to lower the risk of an increase in herbicide-resistant weeds. Effective and broad-spectrum weed control over a comparatively longer length of time can be achieved by mixing various active chemicals with distinct modes of action, hence preventing the development of resistance.Various prior arts in herbicidal compositions are tailored based on the active ingredients are used along with their intended applications. However, existing herbicidal combinations shows adverse effect on plants and crops such as discoloration of plant leaves, resistance weeds complex and are ineffective against control of all stages of weeds.

[0008] Reference can be made to CN120753272 A, which discloses oxadiazon-glyphosate wettable powder is characterized by comprising the following components of 5.3% -10.5% of oxadiazon, 46.0% -51.8% of glyphosate ammonium salt, 5% -10% of auxiliary agent and 100% of filler.

[0009] Further reference can be made to CN101485319 A, which discloses a weeding composition containing oxadiazon and butralin is characterized by comprising the effective components of 5-tert-butyl-3- (2, 4-dichloro-5 -isopropoxyphenyl) -1, 3, 4-oxadiazoline-2-one A and N-sec-butyl-4-tert-butyl-2, 6-dinitroaniline B according to the weight ratio of 1: 0.5 to 50 parts by weight of a mixture.

[0010] Further reference can be made to CN103283757 A, which discloses a weeding composition containing bensulfuron methyl and quinclorac is characterized in that the weeding composition takes the bensulfuron methyl and the quinclorac as main effective components, wherein the weight ratio of the bensulfuron methyl to the quinclorac is 1-5: 0.02-3.

[0011] Thus, there is a need to overcome these challenges mentioned herein above. In view of the same, the present objectives to develop a stable synergistic herbicidal composition having an enhanced efficacy, reduce the likelihood of resistance development, reduce toxicity, increase residual activity, reduced dosages, offers broader crop protection, improved and healthy foliage, improved crop yield, saves labour, mitigate environmental impact and economical and is yet cost effective to the end user.

[0012] The stable synergistic herbicidal composition of the present invention will thereby target multiple biological pathways in weed, thereby increasing mortality rates and reduces the probability of resistance and where actives in the novel composition are mutually compatible and also resulting in stable composition also. Therefore, the aim of the present invention is to provide a stable synergistic herbicidal composition that addresses these needs by providing a novel composition that combines active ingredients and that too in specific weight percentage ranges. Composition of present invention has demonstrated superior efficacy in controlling a broad spectrum of weeds while being environmentally sustainable.A compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol-2(3H)-one is a phenyloxadiazolone herbicide and used to control bindweed and some annual broad-leaved weeds. It pertains to irreversible cell membrane damage and acting as an Inhibits protoporphyrinogen oxidase. It is used for the control a broad spectrum of weeds such as crabgrass; annual bluegrass; goosegrass; buttonweed; annual sedge on a range of crops including turf, sports greens & ornamental grass and shrubs, Vines; Trees, etc.

[0013] Further, a compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2-pyrimidinyl) amino]carbonyl]amino]sulfonyl]methyl]benzoate is an pyrimidinyl sulfonylurea herbicide used to control annual and perennial weeds and sedges. It pertains to a inhibits plant amino acid synthesis -acetohydroxyacid synthase (AHAS). It is an herbicide used for the controlling a variety of annual and perennial weeds and sedges such as pigweed; chickweed; wild mustard; stinkgrass; barnyardgrass; rice flatsedge; dwarf umbrella grass; nut-grass; creeping water primrose found in various crops such as cereals especially wheat; rice, etc.

[0014] Moreover, Pretilachlor is a chloroacetamide herbicide used to control the most common weeds found in paddy rice crops. It pertains to inhibition of cell division due to inhibition of very long chain fatty acids (VLCFA). It is used for controlling annual grasses and broad-leaved weeds including Echinochloa Beauvois, Cyperus difformis, Monochoria vaginalis, sedges found in paddy fields, etc.

[0015] Furthermore, Butachlor is also a chloroacetamide herbicide. It pertains to irreversible cell membrane damage due to inhibits protoporphyrinogen oxidase. It is used for controlling broad-spectrum, pre- and post-emergent herbicide used to control used for pre-emergence control of annual grasses and some broadleaved weeds particularly barnyard grass; crab grass; torpedo grass; witchgrass; red deadnettle found in rice; wheat; barley; peanuts, etc.

[0016] In view of the drawbacks associated with the prior arts, there exists a need to provide a stable synergistic herbicidal composition for synergistic and effective control of weeds. The present invention satisfies the existing needs, as well as others, and generally overcomes the deficiencies found in the prior art. The present invention composition is synergistic, efficacious, environmentally friendly, simple to formulate, stable and is safe to use.

[0017] Thus, an herbicidal composition of the present invention aims to overcome the problems of the prior art and provides a stable synergistic herbicidal composition comprising bioactive amounts of A) Compound ofFormula I, i.e., 5 -tert -butyl-3 -(2, 4-dichloro-5 -isopropoxyphenyl)-!, 3, 4-oxadiazol-2(3H)-one or its agrochemically acceptable salts, esters and derivatives; B) Compound of Formula II, i.e., methyl 2-[[[[[(4, 6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl] methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and C) at least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0018] OBJECTIVES AND ADVANTAGES OF THE INVENTION

[0019] The principal objective of the present invention is to provide a novel and effective stable synergistic herbicidal composition demonstrating high efficacy and to provide protection to crops, plants against various weeds.

[0020] It is another objective of the present invention to provide improved, stable and ready to use herbicidal composition having synergistic and superior efficacious properties compared to prior art formulations or mixtures or compositions.

[0021] It is another objective of the present invention to provide a novel and effective stable synergistic herbicidal composition as one shot application or lower application rates for killing / controlling harmful weeds in plants including grassy weeds, broad leaved weeds, gramineous weeds and sedges in various crops.

[0022] It is yet another objective of the present invention to provide a novel and effective stable synergistic herbicidal composition demonstrating high efficacy and high selectivity.

[0023] It is another objective of the present invention to provide a novel and effective stable synergistic herbicidal composition which can be easily formulated.

[0024] It is yet another objective of the present invention to provide improved combination of herbicides for broad spectrum control of weeds.

[0025] 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.

[0026] It is another objective of the present invention to provide a novel and effective stable synergistic herbicidal composition which is ideal for weed resistance management.

[0027] It is another objective of the present invention to provide a novel and effective stable 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 stable synergistic herbicidal composition which provides broader and more complete spectrum of weed control.

[0028] It is another objective of the present invention to provide a novel and effective stable herbicidal composition which is environmentally safe, possesses broad spectrum bio-efficacy and is less toxic or non-toxic in terms of phytotoxicity.

[0029] It is yet another objective of the present invention to provide a method and a stable synergistic herbicidal composition for controlling weeds. Yet another objective of the present invention to provide a novel and effective synergistic herbicidal composition which has both preventive and curative action and is active against all life stages of weeds and that promotes plant health, growth and increases plant, crop yield in the field.

[0030] It is another objective of the present invention to provide a novel and effective stable synergistic herbicidal composition and a method of controlling pre-emergence, early post emergence to late post emergence weeds.

[0031] It is another objective of the present invention to provide a novel and effective stable synergistic composition which provide excellent crop safety in terms of no phytotoxicity and no adverse effect on germination or growth of succeeding crops due to reduced amount of dosage.

[0032] Yet another objective of the present invention is to provide a composition and method for controlling various weeds in plants, crops and plant propagation materials. Another objective of the present invention is to provide one shot application of novel and effective synergistic herbicidal composition for killing / controlling highly resistant weeds at lower application rates.

[0033] It is another objective of the present invention to provide a novel and effective synergistic herbicidal composition which is environmentally safe, possesses broad spectrum bio-efficacy, is non-phytotoxic and has improved stability during the desired shelf life at various temperature and pH conditions and has enhanced efficacy and penetration capacity and is economically more beneficial.

[0034] It is another objective of the present invention to provide a novel and effective synergistic herbicidal composition which further optionally comprises additives, inert ingredients and / or adjuvants, for providing the enhanced stability, enhanced permeability, improved penetration capacity, uniform spray-ability, improved rain-fastness, enriched biotic factors, better flowability, enhanced spreading or coverage effect,effective storage stability, longer residual effect, improved uptake of active ingredients, and safer to the environment attributes to the composition of present invention.

[0035] Another objective of the present invention is to provide a stable synergistic herbicidal composition comprising A) Compound of Formula I, i.e., 5 -tert -butyl-3 -(2, 4-dichloro-5 -isopropoxyphenyl)- 1,3,4-oxadiazol-2(3H)-one or its agrochemically acceptable salts, esters and derivatives; B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and C) at least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0036] Yet another objective of the present invention is to provide a process for the preparation of a stable synergistic herbicidal composition comprising A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5 -isopropoxyphenyl)-!, 3, 4-oxadiazol-2(3H)-one or its agrochemically acceptable salts, esters and derivatives; B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and C) at least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0037] Some or all these and other objects of the invention can be achieved by way of the invention described hereinafter.

[0038] ADVANTAGES:

[0039] 1. The synergistic herbicidal composition of the present invention results in significant lowering the count of weeds such as Alternanthera sessillis, Ammania baccifera, Commelina benghalensis, Cynodon doctylon, Cyperus difformis, Cyperus iria, Cyperus rotundus, Digitaria sanguinalis, Echinochloa beauvois, Echiniochloa colonum, Echinochloa Crusagalli, Echinochloa spp., Eclipta alba, Eleusine indica, Enhydra fluctuans, Fimbristylis miliacae, Leptochloa chinensis, Ludwigia parviflora, Ludwigia sp., Marsilea quadrifoliate, Monochoria vaginalis, Panicum repens, Panicum spp., Scirpus royeli, Setaria spp., Sphenoclea zeylanica and other weeds such as crabgrass, annual bluegrass, goosegrass, buttonweed, annual sedge, pigweed, chickweed, wild mustard, stinkgrass, bamyardgrass, rice flatsedge, dwarf umbrella grass, nut-grass, creeping water primrose, sedges, barnyard grass, crab grass, torpedo grass, witchgrass, red deadnettle, etc.

[0040] 2. The synergistic herbicidal composition of the present invention decreases the chances of resistance against weeds.3. The synergistic herbicidal composition of the present invention shows to have an improved stability during desired shelf life and promotes plant health and increases plant yield in the field.

[0041] 4. The synergistic herbicidal composition of the present invention shows no phytotoxicity effect and provide a stable synergistic herbicidal composition that shows technical advancement over the existing combination of herbicides and also shows to has an improved rain fastness.

[0042] 5. The stable synergistic herbicidal composition of the present invention resulted in significantly lower incidence of herbicidal in various crops such as turf, sports greens & ornamental grass and shrubs, vines; trees, cereals especially wheat; rice, barley; peanuts, etc.

[0043] 6. The stable synergistic herbicidal composition of present invention provides increased dispersibility, enhanced efficacy, increased weed control, application convenience, environment safety and ultimately, high crop yields.

[0044] 7. The stable synergistic herbicidal composition of the present invention is effective in the management of pre-emergent or post-emergent, monocotyledonous and dicotyledonous weeds.

[0045] SUMMARY OF THE INVENTION

[0046] Accordingly, the main aspect of the present invention is to provide a stable synergistic herbicidal composition having high weeds control efficacy.

[0047] Accordingly, the present invention relates to a stable synergistic herbicidal composition comprising A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0048] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and

[0049] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0050] In another aspect, the present invention provides a stable synergistic herbicidal composition comprising:

[0051] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0052] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives; and

[0053] D) One or more agrochemically acceptable excipients.

[0054] In one another aspect, the present invention provides a stable synergistic herbicidal composition comprising:

[0055] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0056] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;

[0057] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives; and

[0058] D) At least one or more additive.

[0059] In one another aspect, the present invention provides a stable synergistic herbicidal composition comprising:

[0060] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0061] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;

[0062] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives;

[0063] D) At least one or more additive selected from Urea clathrate, Siloxane polyalkyleneoxide copolymer, tallow amine ethoxylate, ammonium sulphate, Epoxide soybean oil, Methylated soyabean oil, and silicone ethoxylated oil either alone or in combination thereof; and

[0064] E) One or more agrochemically acceptable excipients.In one another aspect, the present invention provides a stable synergistic herbicidal composition comprising:

[0065] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0066] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition; and C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition;

[0067] In one another aspect, the present invention provides a stable synergistic herbicidal composition comprising:

[0068] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0069] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0070] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition; and D) One or more agrochemically acceptable excipients.

[0071] In one another aspect, the present invention provides a stable synergistic herbicidal composition comprising:

[0072] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0073] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition;

[0074] D) At least one or more additive selected from Urea clathrate, Silwet Power, tallow amine ethoxylate, ammonium sulphate, Epoxide soybean oil, Methylated soyabean oil, and silicone ethoxylated oil either alone or in combination thereof, in the range of 0.001-20% by weight of the composition; and

[0075] E) One or more agrochemically acceptable excipients.

[0076] In yet another aspect, the present invention provides a process for preparation of the stable synergistic herbicidal composition comprising:

[0077] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0078] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and

[0079] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0080] In an aspect of the present invention, the present invention provides a stable synergistic herbicidal composition which further optionally comprises additives, inert ingredients and / or adjuvants, for providing the following attributes to the composition of present invention:

[0081] a) improved penetration capacity, and uniform spray-ability,

[0082] b) enhanced stability and permeability, and improved rain-fastness,

[0083] c) enhanced spreading or coverage effect,

[0084] d) improved uptake of active ingredients, better flowability, and high crops specificity, e) enriched biotic factors, effective storage stability, and safer to the environment.

[0085] In another aspect, the present synergistic herbicidal composition is stable and has enhanced shelf life and effectively control wide range of weeds in various crops.

[0086] In another aspect, the present invention provides a stable synergistic herbicidal composition which has enhanced efficacy and penetration capacity.

[0087] DETAILED DESCRIPTION OF THE INVENTIONIn 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] The term “active ingredient” (a.i.) or “active agent” or “active” used herein refers to that component of the composition responsible for control and reduction of weedsThe terms “plants” and “vegetation” include, but are not limited to, germinant seeds, emerging seedlings, plants emerging from vegetative propagules, and established vegetation.

[0096] The term “crop” shall include a multitude of desired crop plants or an individual crop plant growing at a locus.

[0097] “Bioactive amounts” as mentioned herein means that amount which, when applied for treatment of crops, is sufficient to give effect in such treatment.

[0098] The term “control” means is to reduce the germination of weeds in variety of crops, or to limit the weed related damage or loss in crop plants.

[0099] The term “weeds” used herein refers to the weeds which affect the variety of crops.

[0100] In an especially preferred embodiment of the invention, the yield of the treated plant is increased.

[0101] 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 vigour, quality and tolerance to abiotic or biotic stress is increased. As a result, the health of a plant is increased even in the absence of pest pressure.

[0102] Accordingly, in an especially preferred embodiment according to the invention, the health of a plant is increased both in the presence and absence of biotic or abiotic stress factors. An increase in plant vigor may for example result in an increased yield and / or tolerance to abiotic or biotic stress.

[0103] One indicator for the condition of the plant is the yield. “Yield” is to be understood as any plant product of economic value that is produced by the plant such as grains, fruits, vegetables, nuts, grains, seeds, wood (e.g., in the case of silviculture plants) or even flowers (e.g. in the case of gardening plants, ornamentals). The plant products may in addition be further utilized and / or processed after harvesting.

[0104] In another preferred embodiment of the invention, the yield of the plants treated according to the method of the invention, is increased synergistically.In another especially preferred embodiment of the invention, the plant vigour of the treated plant is increased. In another preferred embodiment of the invention, the plant vigour of the plants treated according to the composition of the present invention is increased synergistically.

[0105] Another indicator for the condition of the plant is the “quality” of a plant and / or its products.

[0106] In an especially preferred embodiment of the invention, the quality of the treated plant is increased.

[0107] In another preferred embodiment of the invention, the quality of the plants treated according to the method of the invention, is increased synergistically.

[0108] The term rain fastness refers to the ability of a substance, such as a herbicide, to remain effective after being applied to a surface and then exposed to rainfall or irrigation. In other words, it measures how well the substance adheres to the target surface and resists being washed away by water. A low rain fastness indicates that it may be washed off or diluted by rainfall, reducing its efficacy.

[0109] The term "Increased uptake of active ingredient" refers to the enhanced absorption or penetration of the active component of a substance, such as herbicide, into the target organism or plant. This increased uptake can lead to greater effectiveness of the product in controlling weeds or undesired vegetation. It may occur through various mechanisms, such as improved formulation, adjuvants that enhance penetration, or modifications to the active ingredient itself to facilitate absorption. Overall, increased uptake of the active ingredient results in improved performance of the product in achieving its intended purpose.

[0110] The term “benefit: cost” refers to a ratio used in a cost-benefit analysis to summarize the overall relationship between the relative costs and benefits of a proposed composition. If a treatment has a benefit-cost ratio greater than 1.0, the treatment is expected to deliver a positive and better outcome.

[0111] In another embodiment of the present invention, there is synergistic and efficacious control of various weeds and undesirable vegetation affecting the plants and crops.

[0112] Another embodiment of the present invention, includes within its scope, all possible salts, esters and derivatives of the active ingredients of the composition.

[0113] It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments of the invention only and is not intended to limit the scope of the invention in any manner. The use of examples anywhere in this specification including examples of any terms discussed herein isillustrative 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.

[0114] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the case of conflict, the present document, including definitions will control.

[0115] The composition or formulation according to the present invention has a reduced or zero phytotoxicity with respect to agricultural crops. This results in the present invention effective and possible in the selective control of weeds including narrow and broad leaf weeds, sedges etc.

[0116] In an embodiment, the stable synergistic herbicidal composition or formulation has a reduced or zero phytotoxicity with respect to important agricultural crops. This results in the present invention effective and possible in the selective control of weeds.

[0117] It has been observed that the composition of present invention not only provides synergistic effect but also gives control of weeds for a longer duration as compared to solo and binary formulations of herbicides.. In addition, the stable synergistic herbicidal composition of the present invention is effective against all developmental stages of weeds.

[0118] In an embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0119] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0120] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and

[0121] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0122] In an embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0123] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and

[0124] C) Pretilachlor or its agrochemically acceptable salts, esters or its derivatives.

[0125] In an embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0126] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0127] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and

[0128] C) Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0129] In another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0130] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0131] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;

[0132] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives; and

[0133] D) One or more agrochemically acceptable excipients.

[0134] In another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0135] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0136] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;C) Pretilachlor or its agrochemically acceptable salts, esters or its derivatives; and

[0137] D) One or more agrochemically acceptable excipients.

[0138] In another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0139] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0140] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;

[0141] C) Butachlor or its agrochemically acceptable salts, esters or its derivatives; and

[0142] D) One or more agrochemically acceptable excipients.

[0143] In one another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0144] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0145] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;

[0146] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives; and

[0147] D) At least one or more additive.

[0148] In one another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0149] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;

[0150] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives;

[0151] D) At least one or more additive selected from Urea clathrate, Siloxane polyalkyleneoxide copolymer, tallow amine ethoxylate, ammonium sulphate, Epoxide soybean oil, Methylated soyabean oil, and silicone ethoxylated oil either alone or in combination thereof; and

[0152] E) One or more agrochemically acceptable excipients.

[0153] In one another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0154] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0155] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;

[0156] C) Pretilachlor or its agrochemically acceptable salts, esters or its derivatives;

[0157] D) At least one or more additive selected from Urea clathrate, Siloxane polyalkyleneoxide, tallow amine ethoxylate, ammonium sulphate, Epoxide soybean oil, Methylated soyabean oil, and silicone ethoxylated oil either alone or in combination thereof; and

[0158] E) One or more agrochemically acceptable excipients.

[0159] In one another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0160] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0161] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;C) Butachlor or its agrochemically acceptable salts, esters or its derivatives;

[0162] D) At least one or more additive selected from Urea clathrate, Siloxane Polyalkyleneoxide copolymer, tallow amine ethoxylate, ammonium sulphate, Epoxide soybean oil, Methylated soyabean oil, and silicone ethoxylated oil either alone or in combination thereof; and

[0163] E) One or more agrochemically acceptable excipients.

[0164] In one another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0165] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0166] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition; and C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition.

[0167] In one another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:

[0168] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0169] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0170] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition; and D) One or more agrochemically acceptable excipients.

[0171] In one another embodiment, the present invention provides a stable synergistic herbicidal composition comprising:A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0172] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl] amino] sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;

[0173] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition;

[0174] D) At least one or more additive selected from Urea clathrate, Siloxane polyalkyleneoxide copolymer, tallow amine ethoxylate, ammonium sulphate, Epoxide soybean oil, Methylated soyabean oil, and silicone ethoxylated oil either alone or in combination thereof, in the range of 0.001-20% by weight of the composition; and

[0175] E) One or more agrochemically acceptable excipients.

[0176] In yet another embodiment, the present invention provides a process for preparation of the stable synergistic herbicidal composition comprising:

[0177] A) Compound of Formula I, i.e., 5-tert-butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-l,3,4-oxadiazol- 2(3H)-one or its agrochemically acceptable salts, esters and derivatives;

[0178] B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; and

[0179] C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

[0180] 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:

[0181]

[0182]

[0183] In one embodiment of the present invention, the synergistic herbicidal composition results in an increased yield of the treated plant. In another embodiment of the invention, there is synergistic and efficacious control of various weeds affecting the plants and crops. The present invention includes within its scope, all possible salts, esters and derivatives of the active ingredients of the composition.

[0184] In one of the embodiments, the synergistic herbicidal composition or formulation according to the present invention has a reduced or zero phytotoxicity with respect to important agricultural crops. This results in the present invention effective and possible in the selective control of weeds.

[0185] In an embodiment of the present invention, the stable synergistic herbicidal composition further optionally comprises additives, inert ingredients and / or adjuvants, for providing the following attributes to the composition of present invention:

[0186] a) uptake of active ingredients, and effective storage stability,

[0187] b) high crops specificity, and improved rain-fastness,

[0188] c) enhanced permeability and stability, and enriched biotic factors,

[0189] d) uniform spray-ability,

[0190] e) better flowability, and enhanced spreading or coverage effect,

[0191] f) improved penetration capacity, and safer to the environment.

[0192] In another embodiment of the present invention, the stable 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), co-dispersant, anti-freezing agent(s), emulsifier(s) (anionic and non-ionic), anti-foaming agent / defoamer(s), wetting agent(s), antimi crobial / anti -bacterial agent(s), anti-caking agent , thickening agentZthickener(s), quick coating agent(s) or sticking agentsZsticker(s), spreader(s), binder(s), pH-adjusting agent(s), anti-caking agent(s), adjuvant(s), filler(s) / suspension aid(s), colorant(s), carrier(s), buffering agent(s), polymer(s)rheology modifier(s), solvent(s), co-solvent(s) , biocide or a combination thereof. Additional components may also be included, e.g., protective colloid(s), carrier(s), adhesive(s), thixotropic agent(s), penetration agent(s), stabiliser(s), sequestering agent(s), safener(s). More generally, the active materials can be combined with any solid or liquid carrier / additive, which complies with usual formulation techniques.An adjuvant used in the present Invention is any material that is added to an agrochemical formulation to enhance or modify the performance of the formulation. An adjuvant used in the present invention to make it a safer to ecological environmental, having low toxicity and having no phytotoxicity effects on any part of the plant.

[0193] Examples of surfactant(s) and / or dispersing agent and / or co-dispersant used herein include but not limited polymeric anionic dispersant, polyarylphenyl ether phosphate, tristyryl phenol ethoxylate, Polymethyl methacrylate-polyethylene glycol graft copolymer, acrylate copolymer, acrylic copolymer, Ammonium Distyrylphenyl Ether Sulphate, polymeric dispersant, Calcium salt of alkyl benzene sulphonate, Non-ionic surfactant, polyalkoxylated butyl ether, acrylic graft copolymer, Sodium methyl oleoyl taurate , non-ionic proprietary surfactant, Methyl naphthalene sulfonic acid, polymer with formaldehyde, sodium salt, ethoxylated tristryl phenol Sulphate, alkyl naphthalene formaldehyde condensate , naphthalene sulfonic acid, phenol sulfonic acid-formaldehyde polycondensation as sodium salt, sodium salt condensate with formaldehyde, ethoxylated oleyl cetyl alcohol, Anionic tristyrylphenol phosphate surfactant, Sodium Alkyl Naphthalene Sulfonate Blend, polyalkelene glycol ether, Sodium alkyl naphthalene sulfonate formaldehyde condensate, Sodium Isopropyl Naphthalene Sulfonate, Dialkyl naphthalene sulphonate sodium salt, Naphthalene Sulphonic Acid, Formaldehyde, Ethoxylated fatty glyceride , Ethoxylated Polyarylphenol Phosphate Ester, Lignosulfonic Acid, Sodium Salt, Sulfomethylated, ethoxylated fatty alcohol, methyl naphthalene sulfonic acid, polymer with formaldehyde sodium salt, Sodium polymethyl methacrylate, sodium polyacrylate, alkyl naphthalene sulfonate formaldehyde condensate or its sodium salt , Sodium Naphthalene Sulfonate formaldehyde condensate, sodium lignosulfonate, calcium lignosulphonate, Sodium Alkyl Naphthalene Sulfonate, alkylphenol polyoxyethylene ether, sodium salt of naphthalene sulfonate condensate, alkyl naphthalene sulfonate condensate blend, polymeric surfactant, sodium salt of alkyl naphthalene sulfonate, sodium salt of methyl naphthalene sulfonate, polycarboxylate or its sodium salt, naphthalene sulfonic acid-branched and linear derivative sodium salts, fatty alcohol polyoxyethylene ether, alcohol polyglycol ether, non-aqueous dispersant - non-ionic polymeric surfactant, aqueous dispersant - polymeric amphoteric aqueous dispersant or mixtures thereof and present in the range of 0.001-20% by weight of the composition.

[0194] Examples of wetting agent used herein include but not limited to tristyrylphenol ethoxylate non-ionic emulsifier, mixture of non-ionic surfactants, Blend of Anionic and Non-ionic, alkoxylated alcohol, block copolymer, alcohol polyglycol ether, alkyl olefin sulphates, dioctyl sulpho succinate, alkyl naphthalene sulphate , Di-isopropyl Napthalene sulphonate, Benzenesulfonic acid, Hydroxy polymer with formaldehyde, Phenol and Urea sodium salt, Polyalkoxy ethers, alkyl phenol ethoxylates, tri-styrenatedphenol ethoxylate, EO / PO block co-polymers, butyl polyalkylene oxide block copolymer, sodium lauryl sulphonate, Alpha olefin sulphonate, sodium sulphates or mixtures thereof and present in the range of 0.01-20% by weight of the total composition.

[0195] Examples of defoamer or antifoaming agent used herein include but not limited to silicon emulsion based anti-foam agents, Siloxane polyalkyleneoxide, Polydimethylsiloxane, Polyalkyleneoxide-modified Polydimethylsiloxane, trisiloxane ethoxylates, silicone oil, silicone compound, CIO ~C20 saturated fat acid compounds or C8~C10 aliphatic alcohols compound, vegetable oil based antifoam, tallow based fatty acids, polyalkyleneoxide polydimethylsiloxane emulsion and mixtures thereof and present in the range of 0.01-5.0 % by weight of the composition.

[0196] 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 0.01-20% by weight of the composition.

[0197] Examples of fillers used herein include but not limited to silicon dioxide, china-clay, kaolin, starch, bentonite, precipitated silica, fumed silica, lactose monohydrate, 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 0.1-60 % by weight of the composition.

[0198] Examples of anti-caking agent used herein include but not limited to group of talc, hydrous magnesium silicate, magnesium carbonate, calcium carbonate, precipitate silica, silica powder, hydrophobic fumed silica and mixtures thereof and present in the range of 0.1-10% by weight of the composition.

[0199] Examples of carrier used herein include but not limited to silicon dioxide, china clay, kaolin, starch, bentonite, precipitated silica, silica powder, fumed silica, ppt silica powder, lactose monohydrate, talcum powder, lactose, ammonium sulpha or mixture thereof and present in the range of 1.0-45 % by weight of the composition.

[0200] 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 l-hydroxy-2(lH)-pyridinethione, blends of zinc l-hydroxy-2(lH)-pyridinethione and zinc oxide, and2-n-octyl-4- isothiazolin-3-one or mixture thereof and present in the range of 0.01 to 10 % by weight of the composition.

[0201] Examples of rheology modifier or thickeners or thickening agents or suspending agents used herein include but not limited to polysaccharides, carboxymethyl cellulose, bentonite clay, aluminium magnesium silicate, hydroxy propyl cellulose, xanthan gum, gum arabic, Silica powder, gaur gum, carbomer, chitosan, precipitated silica or mixtures thereof and present in the range of 0.01-5.0 % by weight of the composition.

[0202] Examples of emulsifier(s) used herein include but not limited to araliphatic or aliphatic non-ionic oil emulsifier-ethoxylated sorbitol hexaester derived from oleic acid, emulsifier such as ethoxylated mono-, di- and trialkylphenols, ethoxylates of long-chain alcohols and polyethylene oxide / polypropylene oxide homo- and copolymers, Polymeric emulsifier (Nonionic polyalkylene oxide block copolymer), Ethoxylates of long-chain alkanols, Castor oil ethoxylate , ethoxylated monoalkylphenol, ethoxilates of cetyl alcohol and / or stearyl alcohol ; Tri styrylphenol ethoxylate -20 mole, Ethoxylated Tristyrylphenol ,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 0.01 -20 % by weight of the composition.

[0203] 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 (NMP) , Solvent Naphtha (Solvent C-9), Di methyl sulfoxide (DMSO), Dimethylformamide (DMF), N- alcohol, 2-ethyl hexanol , alkyl amide, vegetable oil, mineral oil, distilled water, aromatic solvents, water or mixtures thereof and present in the range of 1.0 to 20% by weight of the composition.

[0204] Examples of colouring pigment(s) / dye(s) used herein include but not limited to red dye FGR03, Permanent Rubin L5-B-01, pigment blue 15:4, pigment blue 15:3, pigment blue 15:2, pigment blue 15:1 , pigment blue 80, pigment yellow 1 , pigment yellow 13, pigment red 112, pigment red 48:2, pigment red 48:1 , pigment red 57: 1 , pigment red 53:1 , pigment orange 43, pigment orange 34, pigment orange 5, pigment green 36, pigment green 7, pigment white 6, pigment brown 25, basic violet 10, basic violet 49, violet 23, acid red 51 , acid red 52, acid red 14, acid blue 9, acid yellow 23, basic red 10, basic red 108 or mixtures thereof and present in the range of 0.01- 10.0 % by weight of the composition.Examples of polymer(s) used herein include but not limited to isocyanate, polyisocyanate used is toluene -2, 4-diisocyanate (TDI), diethylenetriamine (DET A), 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 mixtures thereof and present in the range of 0.01- 5.0 % by weight of the composition.

[0205] Examples of binder(s) used herein include but not limited to polyvinylpyrrolidone, polyvinyl alcohol, methyl cellulose, and carboxymethyl cellulose, polyisocyanate, polyterpene resin or mixtures thereof and present in the range of 0.01- 40 % by weight of the composition

[0206] Examples of preservative(s) used herein include but not limited to Methyl paraben (Methyl p-hydroxybenzoate), Propyl paraben (Propyl p-hydroxybenzoate), Methylisothiazolinone (MIT), Chloromethylisothiazolinone (CMIT), Benzisothiazolinone (BIT), DMDM Hydantoin, Imidazolidinyl Urea, Phenol, Cresol, Chlorocresol, Benzoic acid, Sorbic acid, Salicylic acid, Thymol (natural preservative), Sodium benzoate, Potassium sorbate, Bronopol (2-bromo-2-nitropropane-l,3-diol), Propyl para-hydroxy-benzoate or mixture thereof and present in the range of 0.01- 35 % by weight of the composition.

[0207] Examples of stabilizer(s) used herein include but not limited to butylated copolymer , Butylated Hydroxy Toluene (BHT), Butylated Hydroxyanisole (BHA), Ascorbic Acid (Vitamin C), a benzotriazole UV absorber, Hindered Amine Light Stabilizers (HALS), Oxanilide derivatives, Ethoxylated Alkylphenols (e.g., nonylphenol ethoxylates), Block copolymers, Polyvinyl alcohol (PVA), Acrylic or Butylated Copolymers, Citric acid / Sodium citrate, Phosphates (e.g., Sodium or Potassium phosphate), Acetates (e.g., Sodium acetate), EDTA (Ethylenediaminetetraacetic acid), Citric acid (dual role: pH and chelation), NTA (Nitrilotriacetic acid), Xanthan gum, Attapulgite clay, Bentonite, Hydroxypropyl methylcellulose (HPMC) or mixture thereof and present in the range of 0.01- 35 % by weight of the composition.

[0208] Examples of pH adjusting agent(s) / buffering agent(s) used herein include but not limited to Citric Acid, Citric Acid Monohydrate, Citric Acid Dihydrate, Sodium Citrate, Potassium Citrate, Tartaric Acid, Potassium Hydrogen Tartrate, Lactic Acid, Sodium Phosphate (Monobasic or Dibasic), Potassium Phosphate (Monobasic / Dibasic), Sodium Bicarbonate, Sodium Carbonate, Ammonium Acetate / Ammonium Hydroxide, Acetic Acid, Sodium Acetate, Borax (Sodium Borate) or mixture thereof and present in the range of 0.01- 25 % by weight of the composition.

[0209] In further embodiment, depending on the formulation type, they comprise one or more liquid or solid carriers, appropriate surfactants (such as dispersants, protective colloids, emulsifiers, wetting agents and tackifiers), and appropriate further excipients which are customary for formulating agrochemical compositions.

[0210] Suitable carriers include liquid and solid carriers. Liquid carriers include e.g. non-aqueous solvents such as cyclic and aromatic hydrocarbons, e.g. paraffins, tetrahydronaphthalene, alkylated naphthalenes and their derivatives, alkylated benzenes and their derivatives, alcohols such as methanol, ethanol, propanol, butanol and cyclohexanol, ketones such as cyclohexanone, strongly polar solvents, e.g. amines such as N-methylpyrrolidone, and water as well as mixtures thereof. Solid carriers include e.g. mineral earths such as silicas, silica gels, silicates, talc, kaolin, limestone, lime, chalk, bole, loess, clay, dolomite, diatomaceous earth, calcium sulfate, magnesium sulfate, magnesium oxide, ground synthetic materials, fertilizers such as ammonium sulfate, ammonium phosphate, ammonium nitrate, ureas, and products of vegetable origin such as cereal meal, tree bark meal, wood meal and nutshell meal, cellulose powders, or other solid carriers. In some embodiments, the compositions described herein are employed in combination with one or more herbicide safeners, such as AD-67 (MON 4660), benoxacor, benthiocarb, 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, to enhance their selectivity.

[0211] In yet another embodiment of the present invention, the present stable synergistic 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-lowvolume (ULV) liquid, Water dispersible granules (WG), 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) or a mixed formulation of CS and EW (ZW).

[0212] In yet another preferred embodiment of the present invention, the present stable synergistic pesticidal composition can be formulated as one or more of but not limited to Suspension concentrate (SC), Emulsifiable concentrate (EC), Suspo-emulsion (SE), Micro-emulsion (ME), Oil dispersion (OD) etc. In yet another embodiment of the present invention, the invention further provides the process for preparation of the said herbicidal composition, wherein the said composition can be 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), Ultralow volume (ULV) suspension, Tablet (TB), Ultra-low volume (ULV) liquid, Water dispersible granules (WG), 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) or a mixed formulation of CS and EW (ZW).

[0213] In one embodiment, additives such as Siloxane polyalkyleneoxide copolymer or organosilicone based powder adjuvant that can enhance the water absorption efficiency of hard-to-wet soils by increasing their water infiltration, drainage, water retention and hydrophilicity; tallow amine ethoxylate increases the biocompatibility in environmental applications and help in the interactions of active ingredients; ammonium sulphate help is resistant to leaching and helps the crop to utilize nitrogen efficiently; urea clathrate provides superior wetting and spray retention properties and serves as an excellent nitrogen source for crops and epoxide soybean oil provides increased active ingredient uptake and improved rain fastness to the composition; and epoxide soybean oil provides increased active ingredient uptake and improved rain fastness to the composition. The said additives are stable and hygroscopic resulting in an efficient uptake and functioning. In one embodiment, additives such as urea clathrate, siloxane polyalkyleneoxide copolymer or organosilicone based powder adjuvant , tallow amine ethoxylate, ammonium sulphate, epoxide soybean oil either alone, Methylated soyabean oil, and silicone ethoxylated oil or in combination thereof, present in the range of 0.001 - 20% by weight of the composition.In one embodiment, in agrochemical compositions, additives such as urea clathrate, Siloxane Polyalkyleneoxide copolymer or organosilicone based powder adjuvant, tallow amine ethoxylate, ammonium sulphate, and epoxide soybean oil (ESO) serve distinct yet complementary functions, both individually and synergistically. Urea clathrate stabilizes volatile active ingredients by encapsulating them, thereby improving shelf life and enabling controlled release. Siloxane Poly alkyleneoxide copolymer or organosilicone based powder adjuvant, which are trisiloxane-based superspreaders, reduce surface tension significantly and enhance the spreading, wetting, and penetration of the formulation on plant surfaces, improving bioavailability. Tallow amine ethoxylate, a non-ionic surfactant, aids in emulsification and acts as a strong adjuvant, enhancing the uptake of systemic active ingredients. Ammonium sulphate is commonly used as a water conditioner to prevent antagonism from hard water ions like calcium and magnesium; it also enhances the absorption of pesticides. Epoxide soybean oil (ESO) contributes as a stabilizer and plasticizer, protecting active ingredients from UV and oxidative degradation while improving formulation compatibility.

[0214] In another embodiment, when used in combination in agrochemical composition, these additives enhance the overall efficacy, stability, and environmental safety of the agrochemical composition. For instance, the combined use of Siloxane Polyalkyleneoxide copolymer and ammonium sulphate can significantly boost pesticide performance, while ESO and urea clathrate together offer enhanced protection and sustained release of active ingredients. Thus, their synergistic interaction leads to improved performance and consistency under varying environmental and application conditions.

[0215] In one embodiment, additives such as urea clathrate, Siloxane Polyalkyleneoxide Copolymer or organosilicone-based powder adjuvant, tallow amine ethoxylate, ammonium sulphate, and epoxide soybean oil either alone or in combination thereof, present in the range of 0.01 - 20% by weight of the composition.

[0216] In one preferred embodiment of the present invention, the herbicidal composition comprises a combination of Compound of formula I, Compound of formula II, and Pretilachlor and / or Butachlor, along with at least one adjuvant selected from methylated soybean oil (MSO) and / or silicone -based ethoxylated oil.

[0217] In this embodiment, the inclusion of methylated soybean oil acts as a penetration enhancer and deposition aid, improving the spreading and wetting of the spray solution on the foliage and soil surface. MSO enhances the solubilization of the lipophilic herbicides compound of formula I and Pretilachlor / Butachlor, thereby facilitating improved absorption into target weed tissues. This results in faster uptake, improved translocation, and enhanced herbicidal efficacy, particularly against grassy and broad-leaf weeds under flooded and semi-flooded paddy conditions.In another embodiment, the composition comprises silicone ethoxylated oil as a super-spreader and surface-tension-reducing agent. The silicone ethoxylated oil significantly lowers the surface tension of the spray droplets, enabling uniform coverage of waxy leaf surfaces and improved contact with weed foliage and soil. This leads to superior rainfastness, reduced spray drift, and consistent herbicidal performance even at reduced application volumes.

[0218] In a further embodiment, the composition comprises a combination of methylated soybean oil and silicone ethoxylated oil, wherein the MSO provides enhanced penetration and retention of the active ingredients, while the silicone ethoxylated oil ensures rapid spreading and uniform distribution of the herbicides. The synergistic action of these adjuvants improves the biological efficacy of Oxadiazon, Bensulfuron-methyl, and Pretilachlor / Butachlor at lower doses, thereby reducing phytotoxicity to the crop, minimizing environmental load, and improving cost -effectiveness.

[0219] In yet another embodiment, the use of the said adjuvants enhances the stability of the formulation and improves performance under variable agro-climatic conditions, including high humidity and water-logged soils, without adversely affecting crop safety. The composition thus provides broad-spectrum weed control with improved consistency, reduced re-application frequency, and enhanced overall weed management efficiency.

[0220] In yet another embodiment of the present invention, the present stable synergistic herbicidal composition can be applied to various crops and plants including but not limited to cereals especially wheat; rice, Transplanted Rice, Direct seeded rice under puddled condition, paddy, barley; peanuts, turf, sports greens & ornamental grass and shrubs, vines, trees, etc.

[0221] In yet another embodiment of the present invention, the present herbicidal composition provides synergistic and effective control against weeds including grasses such as Alternanthera sessillis, Ammania baccifera, Commelina benghalensis, Cynodon doctylon, Cyperus difformis, Cyperus iria, Cyperus rotundus, Digitaria sanguinalis, Echinochloa beauvois, Echiniochloa colonum, Echinochloa Crusagalli, Echinochloa spp., Eclipta alba, Eleusine indica, Enhydra fluctuans, Fimbristylis miliacae, Leptochloa chinensis, Ludwigia parviflora, Ludwigia sp., Marsilea quadrifoliate, Monochoria vaginalis, Panicum repens, Panicum spp., Scirpus royeli, Setaria spp., Sphenoclea zeylanica and other weeds such as crabgrass; annual bluegrass; goosegrass; buttonweed; annual sedge, pigweed; chickweed; wild mustard; stinkgrass; barnyardgrass; riceflatsedge; dwarf umbrella grass; nut-grass; creeping water primrose, sedges, barnyard grass; crab grass; torpedo grass; witchgrass; red deadnettle, etc.

[0222] In yet another embodiment, the composition according to the invention can be applied to any and all developmental stages of weeds. The weeds may be controlled by contacting the target weeds or its locus with a bioactive amount of stable synergistic herbicidal composition of the present invention.

[0223] In yet another embodiment, the present stable synergistic herbicidal composition of the present invention can be applied to a plant / crop / soil by spraying, rubbing, atomizing, irrigating, evaporating, dusting, fogging, broadcasting, pouring, mist blowing, soil mixing, foaming, painting, spreading -on, drenching, dipping or drip irrigation, etc.

[0224] In yet another embodiment, the composition of the present invention can also comprise or may be applied together and / or sequentially with further active compounds. These further compounds can be selected from fertilizers or micronutrient donors or microorganisms or other preparations that influence plant growth, such as inoculants (e.g., a strain of nitrogen-fixing bacteria), and plant inducers.

[0225] 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. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments of the invention only and is not intended to limit the scope of the invention in any manner. 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. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the case of conflict, the present document, including definitions will control.

[0226] Representative examples of the present composition of this invention are provided below and are not to be construed as limiting in any manner:

[0227]

[0228]

[0229]

[0230]

[0231] Example A. Compound of formula 18.5 % + Compound of formula II 4 % + Pretilachlor 1 % EC

[0232]

[0233] FORMULATION PROCESS

[0234] 1. Into a clean and dry reactor charged solvent C-9 and started stirring.

[0235] 2. To this mixture added Dimethylformamide (DMF) and mix well

[0236] 3. Add technical Compound of formula I , technical Compound of formula II and technical Pretilachlor. Mixed well to dissolve and get a clear solution.

[0237] 4. Added Emulsifier (Blend of Anionic and Non-ionic) and safener and mixed well to form an emulsifiable concentrate.

[0238] 5. Filtered this solution through sparkler filter and collected the filtrate into another clean and dry vessel.

[0239] 6. Packed the formulation in QA approved containers.

[0240] STABILITY DATA- Compound of formula I 20% + Compound of formula II 3.2% + Pretilachlor 40 % EC

[0241]

[0242] ""

[0243] ""

[0244] ""

[0245] " "

[0246]

[0247] Example B: Compound of formula I 35% + Compound of formula II 0.01% + Pretilachlor 13 % OD

[0248]

[0249]

[0250] OIL DISPERSION (OD) FORMULATION PROCESS

[0251] 1. Add selected oil and dissolve dispersants / wetting agents under stirring.

[0252] 2. Slowly add finely powdered / micronized active ingredient with high-shear mixing.

[0253] 3. Mix until the active is uniformly wetted and dispersed in oil.

[0254] 4. Mill the dispersion (bead / ball / sand mill) to achieve required particle size.

[0255] 5. Add required additives and safener.

[0256] 6. Homogenize and check particle size, viscosity, suspensibility, stability.

[0257] 7. Filter if required and pack the finished OD formulation.

[0258] STABILITY DATA: Compound of formula I 35% + Compound of formula II 0.01% + Pretilachlor 13 % OD

[0259]

[0260] ""

[0261] "

[0262] "

[0263] ""

[0264] " "

[0265] ""

[0266]

[0267] Example C: Compound of formula I 20 % + Compound of formula II 1.92 % + Pretilachlor 24 % ME

[0268]

[0269] FORMULATION PROCESS:

[0270] General process for the preparation of ME (Micro Emulsion) formulation:

[0271] Process for the preparation of ME (Micro Emulsion) formulation comprising the steps of:1. Charged solvent Propylene Glycol and N methyl pyrrolidone into the vessel and then mix until completely soluble to obtain a mixture.

[0272] 2. Added technicals Compound of formula I, Compound of formula II, and Pretilachlor to this solvent mixture under stirring and at ambient temperature to obtain formulation mixture.

[0273] 3. Then added remaining emulsifier, and stabilizers, safener and other content into this formulation mixture followed by stirring to obtain homogenized.

[0274] 4. Final product is sent for QC approval.

[0275] 5. After approval material is packed in required pack sizes.

[0276] STABILITY DATA: Compound of formula 120 % + Compound of formula II 1.92 % + Pretilachlor 24 % ME

[0277] >

[0278] &

[0279]

[0280] Example D. Compound of formula 19% + Compound of formula II 1.1% + Butachlor 36 % ME

[0281]

[0282]

[0283] FORMULATION PROCESS:

[0284] General process for the preparation of ME (Micro Emulsion) formulation:

[0285] Process for the preparation of ME (Micro Emulsion) formulation comprising the steps of:

[0286] 1. Charged solvent Propylene Glycol and N methyl pyrrolidone into the vessel and then mix until completely soluble to obtain a mixture.

[0287] 2. Added technicals Compound of formula I, Compound of formula II, and Butachlor to this solvent mixture under stirring and at ambient temperature to obtain formulation mixture.

[0288] 3. Then added remaining emulsifier, and stabilizers, safener and other content into this formulation mixture followed by stirring to obtain homogenized.

[0289] 4. Final product is sent for QC approval.

[0290] 5. After approval material is packed in required pack sizes.

[0291] STABILITY DATA- Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36 % ME

[0292] >

[0293] &

[0294]

[0295]

[0296] Example E: Compound of formula 117% + Compound of formula II 0.01% + Butachlor 1 % EC

[0297]

[0298] FORMULATION PROCESS

[0299] 1. Into a clean and dry reactor charged solvent C-9 and started stirring.

[0300] 2. To this mixture added Dimethylformamide (DMF) and mix well

[0301] 3. Add technical Compound of formula I, technical Compound of formula II and technical Butachlor. Mixed well to dissolve and get a clear solution.

[0302] 4. Added Emulsifier (Blend of Anionic and Non-ionic) and safener and mixed well to form an emulsifiable concentrate.

[0303] 5. Filtered this solution through sparkler filter and collected the filtrate into another clean and dry vessel.

[0304] 6. Packed the formulation in QA approved containers.

[0305] STABILITY DATA: Compound of formula I 17% + Compound of formula II 0.01% + Butachlor 1 % EC

[0306] ""

[0307] ""

[0308] ""

[0309] " "

[0310]

[0311] Example F: Compound of formula I 3% + Compound of formula II 5% + Pretilachlor 19 % OD

[0312]

[0313]

[0314] OIL DISPERSION (OD) FORMULATION PROCESS

[0315] 1. Added selected oil and dissolve dispersants / wetting agents under stirring.

[0316] 2. Slowly added finely powdered / micronized active ingredient with high-shear mixing.

[0317] 3. Mixed until the active is uniformly wetted and dispersed in oil.

[0318] 4. Milled the dispersion (bead / ball / sand mill) to achieve required particle size.

[0319] 5. Added required additives and safener.

[0320] 6. Homogenized and checked particle size, viscosity, suspensibility, stability.

[0321] STABILITY DATA: Compound of formula I 3% + Compound of formula II 5% + Pretilachlor 19 % OD

[0322]

[0323] ""

[0324] "

[0325] "

[0326] ""

[0327] " "

[0328] ""

[0329]

[0330] EXAMPLE G: Compound of formula I 3% + Compound of formula II 5% + Butachlor 19 % EW

[0331]

[0332]

[0333] MANUFACTURING PROCESS

[0334] Phase A - Oil phase (actives + solvent + oil-soluble emulsifiers)

[0335] 1. The solvent was charged into a clean, dry reactor and slow agitation was started.

[0336] 2. Oil-soluble emulsifiers (e.g., nonionic such as polyoxyethylene castor oil and anionic such as calcium dodecylbenzene sulfonate paste) were added and mixed for 10-15 minutes until a clear solution was obtained.

[0337] 3. The actives were added in the following order, while maintaining the temperature at 25-35 °C:

[0338] o Compound of formula I was added and dissolved completely.

[0339] o Compound of formula II was added and dissolved; clarity was checked.

[0340] o Butachlor was added and dissolved; slight opalescence was accepted if stable.

[0341] (If required, the solvent was adjusted within the allowed window to obtain a clear to slightly hazy solution.)

[0342] 4. The mixture was de-aired for 5-10 minutes and Phase A was held at 30-35 °C under gentle stirring.

[0343] Phase B - Aqueous phase (water + PG + water-soluble aids)

[0344] 5. In a second reactor, deionized water (-70-80% of total water) was charged.

[0345] 6. Propylene glycol was added and mixed for 5-10 minutes.

[0346] 7. Water-soluble emulsifiers such as sodium lauryl sulfate, along with preservative / biocide and defoamer (kept minimal, with provision for later top-up), were added.

[0347] 8. The pH was adjusted to 6.5 ± 0.5 using a suitable buffer, while ensuring alkalinity did not exceed pH 8 to protect active stability.

[0348] Emulsification (forming the EW)

[0349] 9. High-shear mixing was started on Phase B (medium setting), and Phase A was slowly added into Phase B over 20-40 minutes while maintaining 25-35 °C. A steady vortex was maintained, avoiding air entrainment.10. After addition, homogenization was continued for 10-20 minutes to achieve a fine, uniform emulsion. The pre-check droplet size D50 was targeted at <5 pm.

[0350] Finishing

[0351] 11. Water was topped up to the required weight and pH was fine-tuned to 6.0-7.0.

[0352] 12. Viscosity was adjusted with small additions of propylene glycol, ensuring pourability was maintained.

[0353] 13. Defoaming was carried out if necessary (0.02-0.05% incremental additions).

[0354] 14. The batch was polish-filtered through 100-200 pm to remove agglomerates or foreign particles.

[0355] 15. The final product was filled into clean HDPE bottles with induction-seal caps, ensuring minimal headspace.

[0356] STABILITY DATA- Compound of formula I 3 % + Compound of formula II 5 % + Butachlor 19 % EW

[0357]

[0358]

[0359] Evaluation of synergistic effect of herbicidal composition of the present invention

[0360] 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.

[0361] The synergistic action expected for a given combination of two active components can be calculated as follows:

[0362] XY

[0363] E = (X + Y) - 100

[0364] The synergistic action expected for a given combination of three active components can be calculated as follows:

[0365] (XY+YZ+XZ) (XYZ)

[0366] E = (X + Y + Z) - + - 100 10000

[0367] Where:E represents expected percentage of herbicidal control for the combination of the two or three actives ingredients at defined doses (for example equal to x, y and z, respectively).

[0368] X is the percentage of herbicidal control observed by the compound (Compound of formula I) at a defined dose (equal to x).

[0369] Y is the percentage of herbicidal control observed by the compound (Compound of formula II) at a defined dose (equal to y).

[0370] Z is the percentage of herbicidal control observed by the compound (Pretilachlor) at a defined dose (equal to z).

[0371] When the percentage of herbicidal control observed for the combination is greater than the expected percentage, there is a synergism effect.

[0372] Observed control (%)

[0373] Ratio = - Expected control (%)

[0374] Ratio of O / E > 1, synergism observed

[0375] The present invention is illustrated by way of examples, the examples are meant for illustrative purposes and should not be construed as limiting.

[0376] Experiment for Synergistic activity of composition of present invention:

[0377] Example 1- Details of experiment on Rice crop:

[0378] Field experiment for synergistic activity of Compound of formula I, Compound of formula II and Pretilachlor for the control of weeds in rice crop was conducted at farmer field.

[0379] To evaluate the synergistic effect, rice (Variety: Jaya) crop was sown in spacing of 25 x 15 cm with three replications and in Randomized Block Design (RBD). The treatments were sprayed three days after transplanting as ME formulation @ 2500 ml / ha with the help of Knapsack sprayer fitted with flat fan nozzle. Each active component was applied at four concentrations in different ternary and binary compositions. Solo components were also taken for comparison.

[0380] Treatment details:

[0381]

[0382]

[0383] Treatments T1 to T28 were applied as foliar sprays, while T29 served as the untreated control. Observations were recorded for Echinochloa sp. under narrow-leaf weeds and Ludwigia parviflora under broad-leaf weeds, as these were the dominant and uniformly distributed weed species in the experimental field. Although the test herbicide is effective against a wider spectrum of grassy and broad-leaf weeds, observations and statistical analyses were confined to these two representative species for standardizationand clarity of results. Weed population was assessed at 30 days after application (DAA) using a 0.5 x 0.5 m (0.25 m2) quadrat placed at four random locations per plot. The percent weed control efficiency (WCE) was calculated based on weed population (No. nr2). On the basis of percent WCE, the expected control was computed and compared with the observed control. The results of the trial are presented in Table 1A.

[0384] Table 1A: Synergistic effect of composition of the present invention (Compound of formula I + Compound of formula II + Pretilachlor) against weeds in rice crop

[0385]

[0386]

[0387] It is clearly evident from the data shown in above Table 1 for per cent weed control efficacy in rice crop that the ternary composition of the present invention comprising Compound of formula I + Compound of formula II + Pretilachlor (T1 to T3) is synergistic for weed control with > 1 Colby’s Ratio. The binary compositions of two herbicides (Compound of formula I + Bensulfuron Methyl, Compound of formula I + Pretilachlor and Compound of formula II + Pretilachlor) T5 to T16 are compatible but no synergistic effect was observed for the control of weeds.

[0388] Experiment for Bio-efficacy evaluation of composition of present invention:

[0389] For the ternary and binary composition based on Compound of formula I + Compound of formula II + Pretilachlor evaluation under field conditions, the basic test composition as Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME was manufactured. For ternary composition, Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME was used and for binary compositions Compound of formula I 20% + Compound of formula II 1.92% ME, Compound of formula I 20% + Pretilachlor 24% ME, Compound of formula II 1.92% + Pretilachlor 24% ME were used. The solo formulation of Compound of formula I 20% EC, Compound of formula II 1.92% EC and Pretilachlor 24% EC and other formulations Compound of formula I 25% EC, Compound of formula II 60% DF and Pretilachlor 50% EC available in the market were used for comparison. Furthermore, these herbicide treatments were compared with untreated control treatments.Example 2- Details of experiment on Rice crop:

[0390] Field experiment for synergistic activity of Compound of formula I + Compound of formula II + Pretilachlor for the control of weeds in rice crop was conducted at farmer field.

[0391] To evaluate the synergistic effect, rice (Variety: Jaya) crop was sown in 5 m x 5 m plots maintaining 25 x 15 cm spacing with three replications and in Randomized Block Design (RBD). The treatments were sprayed three days after transplanting as ME formulation @ 2500 ml / ha with the help of Knapsack sprayer fitted with flat fan nozzle. Each active component was applied at three concentrations in different ternary and binary compositions. Solo components were also taken for comparison. The observations were recorded for the following objectives.

[0392] Objectives:

[0393] 1. Bio-efficacy evaluation against weeds on rice crop

[0394] 2. Bio-efficacy evaluation based on crop yield

[0395] 3. Phytotoxicity evaluation based on rice crop

[0396] Treatment details:

[0397]

[0398]

[0399] Methodology:

[0400] Treatments T1 to T18 were applied as foliar sprays, while T19 untreated control. A hand-operated knapsack sprayer fitted with a flat-fan nozzle was used for spray application, with a spray volume of 500 L ha-1.

[0401] In view of the weed flora present in the experimental field, Echinochloa sp. was selected as the representative species for narrow-leaf weeds and Ludwigia parviflora for broad-leaf weeds, as these were the most dominant and uniformly distributed species. Although the test herbicide is effective against a broader spectrum of grassy and broad-leaf weeds, observations and statistical analyses were confined to these two representative species for standardization and clarity of results. Weed population was recorded at 30 days after treatment application (DAT) using a 0.5 x 0.5 m (0.25 m2) quadrat at four fixed locations per treatment plot, and the data were converted to weed density (number nr2). The weed control efficacy was calculated based on weed densities (No. m-2). Crop yield was recorded at harvest. Phytotoxicity observations on rice were also recorded and the results are presented in Tables 2A, 2B and 2C.

[0402] Results:

[0403] Table 2A: Field bio-efficacy evaluation of Compound of formula I 20 % + Compound of formula II 1.92% + Pretilachlor 24% ME against Echinochloa sp. densities (per m2) and WCE (%) in rice crop.

[0404]

[0405]

[0406] Figures in parentheses are square root transformed; WCE= Weed Control Efficiency

[0407] Table 2B: Field bio-efficacy evaluation of Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME against Ludwigia parviflora densities (per m2) and WCE (%) in rice crop.

[0408]

[0409]

[0410] Figures in parentheses are square root transformed; WCE= Weed Control Efficiency

[0411] Table 2C. Field bio-efficacy evaluation of Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME based on yield of rice crop.

[0412]

[0413]

[0414] q / ha= quintal per hactare

[0415] Table 2D. Effect of Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME on phytotoxicity in rice crop.

[0416]

[0417]

[0418]

[0419] From the example, it is clearly seen that the composition of the present invention is superior for controlling the weeds 30 days after application (Table 2A and 2B) in rice crop as compared to the solo and binary compositions and other registered formulated products available in the market i.e. Compound of formula I 25% EC, Compound of formula II 60% DF and Pretilachlor 50% EC. The yield of rice crop also improved in the ternary composition of the present invention comprising Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME as compared to binary, solo and other registered products in the market (Table 2C).

[0420] The disclosed composition Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME @ 1875, 2500, 3125 & 5000 ml / ha showed no phytotoxicity in the rice crop even after 15 and 30 days after application (Table 2D).

[0421] It is evident from the above tables of examples that the composition of the present invention Compound of formula I 20% + Compound of formula II 1.92% + Pretilachlor 24% ME resulted in good control of overall weed flora in rice with higher respective yields as compared to the reference standard products (binary compositions and solo products). Further, the composition of present invention is resulted synergistic. Evaluation of synergistic effect of herbicidal composition of the present invention

[0422] 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.

[0423] The synergistic action expected for a given combination of two active components can be calculated as follows:

[0424] XY

[0425] E = (X + Y) - 100

[0426] The synergistic action expected for a given combination of three active components can be calculated as follows:

[0427] (XY+YZ+XZ) (XYZ)

[0428] E = (X + Y + Z) - + - 100 10000

[0429] Where:E represents expected percentage of herbicidal control for the combination of the two or three actives ingredients at defined doses (for example equal to x, y and z, respectively).

[0430] X is the percentage of herbicidal control observed by the compound (Compound of formula I) at a defined dose (equal to x).

[0431] Y is the percentage of herbicidal control observed by the compound (Compound of formula II) at a defined dose (equal to y).

[0432] Z is the percentage of herbicidal control observed by the compound (Butachlor) at a defined dose (equal to z).

[0433] When the percentage of herbicidal control observed for the combination is greater than the expected percentage, there is a synergism effect.

[0434] Observed control (%)

[0435] Ratio = - Expected control (%)

[0436] Ratio of O / E > 1, synergism observed

[0437] The present invention is illustrated by way of examples, the examples are meant for illustrative purposes and should not be construed as limiting.

[0438] Experiment for Synergistic activity of composition of present invention:

[0439] Example 3- Details of experiment on Rice crop:

[0440] Field experiment for synergistic activity of Compound of formula I , Compound of formula II and Butachlor for the control of weeds in rice crop was conducted at farmer field.

[0441] To evaluate the synergistic effect, rice (Variety: Pusa Basmati 1121) crop was sown in spacing of 25 x 15 cm with three replications and in Randomized Block Design (RBD). The treatments were sprayed three days after transplanting as ME formulation @ 5000 ml / ha with the help of Knapsack sprayer fitted with flat fan nozzle. Each active component was applied at four concentrations in different ternary and binary compositions. Solo compositions were also taken for comparison.

[0442] Treatment details:

[0443]

[0444]

[0445] Treatments T1 to T28 were applied as foliar sprays, while T29 served as the untreated control. Observations were recorded for Echinochloa sp. under narrow-leaf weeds and Ludwigia parviflora under broad-leaf weeds, as these were the dominant and uniformly distributed weed species in the experimental field. Although the test herbicide is effective against a wider spectrum of grassy and broad-leaf weeds, observations and statistical analyses were confined to these two representative species for standardization and clarity of results. Weed population was assessed at 30 days after application (DAA) using a 0.5 x 0.5m (0.25 m2) quadrat placed at four random locations per plot. The per cent weed control efficiency (WCE) was calculated based on weed population (No. nr2). On the basis of percent WCE, the expected control was computed and compared with the observed control. The results of the trial are presented in Table 3A.

[0446] Table 3A: Synergistic effect of composition of the present invention (Compound of formula I + Compound of formula II + Butachlor) against weeds in rice crop

[0447]

[0448]

[0449] It is clearly evident from the data shown in above Table 1 for per cent weed control efficacy in rice crop that the ternary composition of the present invention comprising Compound of formula I + Compound of formula II + Butachlor (T1 to T3) are synergistic for weed control with > 1 Colby’s Ratio. The binary combinations of two herbicides (Compound of formula I + Bensulfuron Methyl, Compound of formula I + Butachlor and Compound of formula II + Butachlor) T5 to T16 are compatible but synergistic effect is not observed for the control of weeds.

[0450] Experiment for Bio-efficacy evaluation of composition of present invention:

[0451] For the ternary and binary composition based on Compound of formula I + Compound of formula II + Butachlor evaluation under field conditions, the basic test composition as Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME was manufactured. For ternary composition, Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME was used and for binary compositions Compound of formula I 9% + Compound of formula II 1.1% ME, Compound of formula I 9% + Butachlor 36% ME, Compound of formula II 1.1% + Butachlor 36% ME were used. The solo formulation of Compound of formula I 9% EC, Compound of formula II 1.1% EC and Butachlor 36% ME and other formulations Compound of formula I 25% EC, Compound of formula II 60% DF andButachlor 50% EC available in the market were used for comparison. Furthermore, these herbicide treatments were compared with untreated control treatments.

[0452] Example 4- Details of experiment on Rice crop:

[0453] Field experiment for synergistic activity of Compound of formula I + Compound of formula II + Butachlor for the control of weeds in rice crop was conducted at farmer field.

[0454] To evaluate the synergistic effect, rice (Variety: Pusa Basmati 1121) crop was sown in 5 m x 5 m plots maintaining 25 x 15 cm spacing with three replications and in Randomized Block Design (RBD). The treatments were sprayed three days after transplanting as ME formulation @ 5000 ml / ha with the help of Knapsack sprayer fitted with flat fan nozzle. Each active component was applied at three concentrations in different ternary and binary compositions. Solo components were also taken for comparison. The observations were recorded for the following objectives.

[0455] Objectives:

[0456] 1. Bio-efficacy evaluation against weeds on rice crop.

[0457] 2. Bio-efficacy evaluation based on crop yield.

[0458] 3. Phytotoxicity evaluation based on rice crop.

[0459] Treatment details:

[0460]

[0461]

[0462] Methodology:

[0463] Treatments T1 to T18 were applied as foliar sprays, while T20 untreated control and T19 served as weeds free treatments. A hand-operated knapsack sprayer fitted with a flat-fan nozzle was used for spray application, with a spray volume of 500 L ha-1.

[0464] In view of the weed flora present in the experimental field, Echinochloa sp. was selected as the representative species for narrow-leaf weeds and Ludwigia parviflora for broad-leaf weeds, as these were the most dominant and uniformly distributed species. Although the test herbicide is effective against a broader spectrum of grassy and broad-leaf weeds, observations and statistical analyses were confined to these two representative species for standardization and clarity of results. Weed population was recorded at 30 days after treatment application (DAT) using a 0.5 x 0.5 m (0.25 m2) quadrat at four fixed locations per treatment plot, and the data were converted to weed density (number nr2). The weed control efficacy was calculated based on weed densities (No. m-2). Crop yield was recorded at harvest. Phytotoxicity observations on rice were also recorded and the results are presented in Tables 4A, 4B, 4C and 4D.

[0465] Results:

[0466] Table 4A: Field bio-efficacy evaluation of Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME against Echinochloa sp. densities (per m2) and WCE (%) in rice

[0467]

[0468]

[0469] Figures in parentheses are square root transformed; WCE= Weed Control Efficiency

[0470] Table 4B: Field bio-efficacy evaluation of Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME against parviflora densities (per m2) and WCE (%) in rice

[0471]

[0472]

[0473] Figures in parentheses are square root transformed; WCE= Weed Control EfficiencyTable 4C. Field bio-efficacy evaluation of Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME based on yield of rice crop.

[0474]

[0475] q / ha= quintal per hactare

[0476] Table 4D. Effect of Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME on phytotoxicity in rice crop.

[0477]

[0478]

[0479] From the example, it is clearly seen that the composition of the present invention is superior for controlling the weeds 30 days after application (Table 4 A and4B) in rice crop as compared to the solo and binary compositions and other registered formulated products available in the market i.e., Compound of formula I 25% EC, Compound of formula II 60% DF and Butachlor 50% EC. The yield of rice crop also improved in the ternary composition of present invention comprising Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME as compared to binary, solo and other registered products in the market (Table 4C).

[0480] The disclosed composition Compound of formula I 9 % + Compound of formula II 1.1% + Butachlor 36% ME @ 3750, 5000, 6250 & 10000 ml / ha showed no phytotoxicity in the rice crop even after 15 and 30 days after application (Table 4D).

[0481] It is evident from the above tables of examples that the composition of the present invention Compound of formula I 9% + Compound of formula II 1.1% + Butachlor 36% ME resulted in good control of overall weed flora in rice with higher respective yields as compared to the reference standard products (binary compositions and solo products). Further, the composition of present invention is resulted synergistic. Through the herbicidal composition of present invention, the number of applications to control wide range of weeds appearing at the same time is minimised. The composition of present invention is highly safe to the user and to the environment. The composition offers the user a single homogenous application eliminating the need for tank mix. The composition also is cost-effective as it provides much greater simultaneous control and can be used in a variety of crops with a broader spectrum of protection.

[0482] In particular, it has now been found various advantageous properties associated with the compositions according to the invention, include but are not limited to: a broadening of the spectrum of herbicidal activity, for example to resistant strains; a reduction in the rate of application of the active ingredients; adequate control of wide range of weeds or undesired vegetation in various crop at a rate of application at which the individual compounds are not very effective, advantageous behaviour during formulating and / or uponapplication, improved stability, improved crop characteristics including crop yields, more developed root system, increase in plant health including height, improved plant vigor, and other advantages familiar to a person skilled in the art.

[0483] 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.

Claims

AIM1. A stable synergistic herbicidal composition comprising:A) Compound of Formula I, i.e., 5 -tert -butyl-3 -(2, 4-dichloro-5 -isopropoxyphenyl)- 1 ,3,4- oxadiazol-2(3H)-one or its agrochemically acceptable salts, esters and derivatives;B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives; andC) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives.

2. The stable synergistic herbicidal composition as claimed in claim 1, comprising:A) Compound of Formula I, i.e., 5 -tert -butyl-3 -(2, 4-dichloro-5 -isopropoxyphenyl)- 1,3, 4- oxadiazol-2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition; andC) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition.

3. A stable synergistic herbicidal composition comprising:A) Compound of Formula I, i.e., 5 -tert -butyl-3 -(2, 4-dichloro-5 -isopropoxyphenyl)- 1,3,4- oxadiazol-2(3H)-one or its agrochemically acceptable salts, esters and derivatives;B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives;C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives; andD) At least one or more additive.

4. A stable synergistic herbicidal composition comprising:A) Compound of Formula I, i.e., 5 -tert -butyl-3 -(2, 4-dichloro-5 -isopropoxyphenyl)- 1 ,3,4- oxadiazol-2(3H)-one or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;B) Compound of Formula II, i.e., methyl 2-[[[[[(4,6-dimethoxy-2- pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate or its agrochemically acceptable salts, esters and derivatives, in the range of 0.001-90% by weight of the composition;C) At least one herbicide selected from Pretilachlor, and Butachlor or its agrochemically acceptable salts, esters or its derivatives, in the range of 0.001-90% by weight of the composition;D) At least one or more additive selected from Urea clathrate, Siloxane polyalkyleneoxide copolymer, tallow amine ethoxylate, ammonium sulphate, Epoxide soybean oil, Methylated soyabean oil, and silicone ethoxylated oil either alone or in combination thereof, in the range of 0.001-20% by weight of the composition.

5. . The stable synergistic herbicidal composition as claimed in claims 1-4, which further comprises one or more agrochemically acceptable excipients.

6. . The stable synergistic herbicidal composition as claimed in claim 1 to 5, wherein agrochemically acceptable excipients comprises surfactant(s), dispersing agent(s), co-dispersant, antifreezing agent(s), emulsifier(s) (anionic and non-ionic), anti-foaming agentZdefoamer(s), wetting agent(s), antimicrobial / anti-bacterial agent(s), anti-caking agent , thickening agent / thickener(s), quick coating agent(s) or sticking agentsZsticker(s), spreader(s), binder(s), pH-adjusting agent(s), anti-caking agent(s), adjuvant(s), filler(s)Zsuspension aid(s), colorant(s), carrier(s), buffering agent(s), polymer(s)rheology modifier(s), solvent(s), co-solvent(s) , biocide(s), safener(s), protective colloid(s), carrier(s), adhesive(s), thixotropic agent(s), penetration agent(s), stabiliser(s), sequestering agent(s) or a combination thereof.

7. . The herbicidal composition as claimed in claim 6, wherein the safener is selected from the group consisting of AD-67 (MON 4660), benoxacor, benthiocarb, 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 and present in the range of 0.01-20% by weight of the composition.

8. . The stable synergistic herbicidal composition as claimed in any one of the claims 1 to 7, 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), 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) or a mixed formulation of CS and EW (ZW).

9. . The stable synergistic herbicidal composition as claimed in claims 1 to 8, wherein the use of said composition promotes plant health, growth and increases plant, crop yield in the field.

10. . A process for preparing a stable synergistic herbicidal composition as claimed in claims 1-8.

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