Weeding composition and application thereof

Abstract

The invention belongs to the technical field of pesticide weeding, and discloses a weeding composition and application thereof.The weeding composition comprises an active ingredient A and an active ingredient B. The active ingredient A is isoxamid, and the active ingredient B is any one of florasulam, penoxsulam and flumetsulam. The mass ratio of the active component A to the active component B is (1: 16)-(80: 1). The invention also discloses the weeding composition. The weeding composition is suitable for preventing and removing broadleaf weeds, nutgrass flatsedge and grassy weeds in various crop fields.

Description

Technical Field

[0001] The present invention belongs to the technical field of pesticide weeding, and discloses a weeding composition and its application. Background Art

[0002] Isoxaflutole, common international name: icafolin, CAS registration number: 2254752-27-5, which belongs to a new type of isoxazole herbicide.

[0003] Florasulam is a triazolopyrimidine sulfonamide herbicide developed by Dow AgroSciences, USA. Florasulam is a systemic herbicide that can be conducted to the whole plant of weeds, so the weed control is thorough and there will be no recurrence. Florasulam has a broad herbicidal spectrum and can control most broad-leaved weeds in wheat fields.

[0004] Penoxsulam is a post-emergence herbicide developed by Dow AgroSciences, USA. It is a triazolopyrimidine sulfonamide herbicide that acts by inhibiting acetolactate synthase. Penoxsulam is a broad-spectrum herbicide for paddy fields and can effectively control barnyard grass and annual sedges, and is effective against many broad-leaved weeds.

[0005] Flumetsulam belongs to triazolopyrimidine sulfonamides and is a typical acetolactate synthase inhibitor. By inhibiting the synthesis of branched-chain amino acids, protein synthesis is blocked and plant growth stops. It has a long residual effect and a broad herbicidal spectrum, and can be used for both soil and foliar treatments.

[0006] Weed control mainly relies on chemical control. At present, there are various types of herbicides on the market with different weeding effects. In order to improve the weeding effect, enhance the safety for crops, and promote the rational and safe use of herbicides, the present invention rationally combines isoxaflutole with any one of florasulam, penoxsulam, and flumetsulam, providing a basis for the comprehensive control of weeds in various crop fields. Summary of the Invention

[0007] Based on the above content, the object of the present invention is to provide a weeding composition, the active ingredients of which comprise isoxaflutole and any one of florasulam, penoxsulam, and flumetsulam. This weeding composition expands the herbicidal spectrum, has excellent control effects on broad-leaved weeds, gramineous weeds, and sedges in various crop fields, is safe for crops, and is suitable for the comprehensive control of field weeds.

[0008] To achieve the above object, the present invention adopts the following technical solution: a weeding composition, the weeding composition contains active ingredient A and active ingredient B, the active ingredient A is isoxaflutole, the active ingredient B is any one of florasulam, penoxsulam, and flumetsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 80:1, or any value within the above ratio range;

[0009] Further, the active ingredient B is florasulam, and the mass ratio of the active ingredient A to the active ingredient B is 5:8 to 40:1, or any value within the above ratio range;

[0010] The active ingredient B is penoxsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 16:1, or any value within the above ratio range;

[0011] The active ingredient B is flumetsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 16:1, or any value within the above ratio range.

[0012] Further, the active ingredient B is florasulam, and the mass ratio of the active ingredient A to the active ingredient B is 5:6 to 20:1, or any value within the above ratio range;

[0013] The active ingredient B is penoxsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:8 to 8:1, or any value within the above ratio range;

[0014] The active ingredient B is flumetsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 8:1, or any value within the above ratio range.

[0015] Further, the total weight of the herbicidal composition is calculated as 100 wt%, and the active ingredients in the herbicidal composition account for 0.01% to 70% of the total weight of the herbicidal composition.

[0016] Further, the dosage forms that the herbicidal composition can be prepared into are solid preparations or liquid preparations.

[0017] Further, the solid preparations are water dispersible granules, wettable powders, granules, and the liquid preparations are suspoemulsions, dispersible oil suspensions.

[0018] The present invention also discloses the application of the above-mentioned herbicidal composition for controlling weeds in crop fields.

[0019] Further, the crop fields are wheat fields, paddy fields, corn fields or soybean fields.

[0020] Further, the weeds are gramineous weeds, broadleaf weeds or cyperaceae weeds;

[0021] The gramineous weeds are Echinochloa crusgalli, Leptochloa chinensis, Digitaria sanguinalis, Eleusine indica, Paspalum distichum;

[0022] The broadleaf weeds mentioned above are Galium aparine, Lithospermum arvense, Euphorbia helioscopia, Eclipta prostrata, Monochoria vaginalis, Sesbania cannabina, Rotala indica, Veronica didyma, Potamogeton distinctus, Stellaria media, Capsella bursa-pastoris, Veronica persica, Descurainia sophia, Silene conoidea, Cirsium setosum, Amaranthus retroflexus;

[0023] The Cyperaceae weeds mentioned above are Eleocharis dulcis, Cyperus difformis, Cyperus iria, Scirpus juncoides.

[0024] Furthermore, the Gramineae weeds are Leptochloa chinensis; the broadleaf weeds are Galium aparine, Euphorbia helioscopia, Veronica didyma, Cirsium setosum, Eclipta prostrata; and the Cyperaceae weeds are Cyperus difformis.

[0025] To obtain an ideal weeding effect, the dosage of the composition varies due to various factors, such as the crop to be protected, the type of pests, the degree of infection, climatic conditions, application location, application method, dosage form adopted, etc.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. The weeding composition provided by the present invention can effectively control weeds in various crop fields and delay the development of weed resistance;

[0028] 2. The weeding composition of the present invention broadens the herbicidal spectrum, has excellent activity against Gramineae weeds, Cyperaceae weeds and broadleaf weeds, has a significant synergistic effect on the control effect of the above weeds compared with single agents, has a long effective period, can reduce the dosage of pesticides, reduce the use cost of pesticides, and reduce the impact on the environment. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Formulation preparation examples:

[0031] Preparation example 1: 22% isoxaben·florasulam suspension concentrate (5:6)

[0032] Formulation composition: 10% isoxaben, 12% florasulam, 2% sulfosuccinate, 1% naphthalene sulfonate formaldehyde condensate, 2% arylphenol polyoxyethylene ether phosphate, 0.25% xanthan gum, 1% magnesium aluminum silicate, 5% glycerol, 0.01% potassium benzisothiazolinone, 0.5% silicone oil, deionized water to make up the balance.

[0033] Preparation method: According to the formula ratio, the active ingredient, surfactant and other functional auxiliaries are sequentially placed in a reaction kettle, mixed evenly with water, subjected to high-speed shearing, wet grinding, and finally homogenized and filtered to obtain the suspension agent product.

[0034] Preparation Example 2: 11% Isoxaben·Florasulam Dispersible Oil Suspension Concentrate (10:1)

[0035] Formulation composition: 10% isoxaben, 1% florasulam, 3% sodium dodecyl sulfate, 5% phenethylphenol polyoxyethylene polyoxypropylene ether, 2% glycerol fatty acid ester polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 1% silicon dioxide, 1% organic bentonite, 15% solvent oil #200, methyl oleate to make up the balance.

[0036] Preparation method: According to the formula ratio, the active ingredient, surfactant and other functional auxiliaries are sequentially placed in a reaction kettle, mixed evenly with oil, subjected to high-speed shearing, wet grinding, and finally homogenized and filtered to obtain the dispersible oil suspension concentrate product.

[0037] Preparation Example 3: 26% Isoxaben·Florasulam Water Dispersible Granules (5:8)

[0038] Formulation composition: 10% isoxaben, 16% florasulam, 8% naphthalene sulfonate formaldehyde condensate, 4% sodium dodecylbenzenesulfonate, 2% sodium dodecyl sulfate, 5% white carbon black, 30% starch, kaolin to make up the balance.

[0039] Preparation method: According to the formula ratio of the example, the active ingredient is added to the carrier, and a surfactant and other functional auxiliaries are added thereto, mixed, 10 - 25% of water is added after air flow pulverization, and then the product is obtained through kneading, granulation, drying, and screening; or the pulverized powder is sprayed with water, granulated, dried in a fluidized bed granulator, and then screened to obtain the product.

[0040] Preparation Example 4: 21% Isoxaben·Florasulam Wettable Powder (20:1)

[0041] Formulation composition: 20% isoxaben, 1% florasulam, 8% sodium lignosulfonate, 5% styrylphenol polyoxyethylene ether sulfate, 6% dispersant NNO, 10% white carbon black, kaolin to make up the balance.

[0042] Preparation method: According to the formula ratio, the active ingredient, dispersant, wetting agent and filler are mixed, and uniformly stirred in a stirring kettle, and pulverized and mixed evenly by an air flow pulverizer for multiple times to prepare the wettable powder of the composition of the present invention.

[0043] Preparation Example 5: 17% Isoxaben·Penoxsulam Suspension Concentrate (1:16)

[0044] Formula composition: 1% isoxazolidinone, 16% penoxsulam, 2% alkylphenol formaldehyde resin polyoxyethylene ether, 5% sorbitan oleate polyoxyethylene ether, 2% tristyrylphenol ethoxylate phosphate, 1% polycarboxylic acid sodium salt, 1.5% magnesium aluminum silicate, 0.1% carboxyethyl cellulose, 1% sodium sorbate, 5% glycerol, 0.5% silicone oil, and deionized water to make up the balance.

[0045] Preparation method: Same as Preparation Example 1.

[0046] Preparation Example 6: 15% isoxadiazole·pentafloxacin dispersible oil suspension (1:1)

[0047] Formula composition: 7.5% isoxazolidinone, 7.5% penoxsulam, 5% castor oil polyoxyethylene ether, 12% glycerol fatty acid ester polyoxyethylene ether, 21% sodium lauryl sulfate, 1% polycarboxylic acid sodium salt, 1% naphthalenesulfonate formaldehyde condensate, and soybean oil makes up the balance.

[0048] Preparation method: Same as Preparation Example 2.

[0049] Preparation Example 7: 25% isoxadiazole·pentafloxacin water dispersible granules (1:4)

[0050] Formula composition: 5% isoxazolidinone, 20% penoxsulam, 5% naphthalenesulfonate formaldehyde condensate, 2.5% BX powder, 1.5% sodium dodecylbenzenesulfonate, 5% white sugar, and kaolin makes up the balance.

[0051] Preparation method: Same as Preparation Example 3.

[0052] Preparation Example 8: 0.3% isoxadiazole-pentasulfuron granules (1:2)

[0053] Formula composition: 0.1% isoxazolidinone, 0.2% penoxsulam, 2% sodium lignin sulfonate, 2% potassium humate, 12% white carbon black, 1% carboxymethyl cellulose, and quartz sand makes up the balance.

[0054] Preparation method: According to the formula ratio, the coating granulation method is adopted to grind and mix the original drug, dispersant and auxiliary agent evenly to form a mother powder, add the mother powder and the carrier into a coating granulator and stir, add the prepared binder aqueous solution while stirring, mix well and then discharge the material, dry and sieve to obtain the granules of the present invention.

[0055] Preparation Example 9: 18% isoxadiazole·pyrasulfuron suspension (1:8)

[0056] Formulation composition: 2% isoxaben, 16% flumetsulam, 1% glycerol fatty acid ester polyoxyethylene ether, 4% alkylphenol polyoxyethylene ether phosphate, 1% sodium lignosulfonate, 0.25% xanthan gum, 5% ethylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, deionized water to make up the balance.

[0057] Preparation method: The same as Preparation Example 1.

[0058] Preparation Example 10: 18% Isoxaben·Flumetsulam dispersible oil suspension (2:1)

[0059] Formulation composition: 12% isoxaben, 6% flumetsulam, 1% ethylene glycol oxyethylene polyoxypropylene ether, 15% glycerol fatty acid ester polyoxyethylene ether phosphate, 1% calcium dodecylbenzenesulfonate, 2% fatty alcohol polyoxyethylene ether sulfate, 1.5% magnesium aluminum silicate, 1% Tesk 869, corn oil to make up the balance.

[0060] Preparation method: The same as Preparation Example 2.

[0061] Preparation Example 11: 27% Isoxaben·Flumetsulam water dispersible granule (8:1)

[0062] Formulation composition: 24% isoxaben, 3% flumetsulam, 10% succinate sulfonate, 2% sodium polycarboxylate, 2% sodium dodecyl sulfate, 10% ammonium sulfate, starch to make up the balance.

[0063] Preparation method: The same as Preparation Example 3.

[0064] Preparation Example 12: 30% Isoxaben·Flumetsulam wettable powder (1:4)

[0065] Formulation composition: 6% isoxaben, 24% flumetsulam, 5% sodium lignosulfonate, 3% sodium octylphenol polyoxyethylene ether sulfonate, 2% Nekal BX, 5% silica white, kaolin to make up the balance;

[0066] Preparation method: The same as Preparation Example 4.

[0067] Test Example 1: Indoor bioactivity determination

[0068] Test basis: The test refers to NY / T 1155.4 2006 "Pesticide indoor bioassay test guidelines Herbicides Part 4: Activity determination test Stem and leaf spray method".

[0069] Test targets: Galium aparine, Euphorbia helioscopia, Veronica didyma, Cirsium setosum.

[0070] Instrument and equipment: Light incubator, quantitative spraying equipment, electronic balance, pots, pipettes, etc.;

[0071] Test soil: The test used air-dried loam soil with an organic matter content of ≤ 3%, neutral pH, good air permeability, and passing through a sieve.

[0072] Test materials: Quantitatively fill the test soil to 4 / 5 of the pot, and then use the bottom infiltration irrigation method to completely moisten the soil to a saturated state. The pre-treated test weed seeds are evenly sown on the soil surface, covered with soil 0.5 cm - 2 cm according to the size of the seeds, and then transferred to the greenhouse for conventional cultivation after sowing, and the bottom infiltration irrigation method is used for water replenishment. Thin out the seedlings and determine the plant population after the weeds emerge to ensure the density inhibition of the weeds.

[0073] Test chemicals: Isoxaben technical, florasulam technical, and flumetsulam technical.

[0074] Chemical preparation: Dissolve the above technical chemicals with a suitable solvent, and then dilute with a 0.1% aqueous solution of Tween 80.

[0075] Chemical treatment: Conduct foliar spray treatment from low dose to high dose according to the test design. Each treatment has 4 replicates, and a treatment without chemicals is set as a blank control. After treatment, wait for the liquid medicine on the surface of the test materials to air dry naturally, and then transfer to the greenhouse for conventional cultivation.

[0076] Investigation: Use the absolute value investigation method to investigate and record the herbicidal activity 14 days after treatment.

[0077] Calculation method:

[0078] Fresh weight control efficacy E = (fresh weight in the control area - fresh weight in the treatment area) × 100 / fresh weight in the control area

[0079] The determination method of the combined action of the mixture uses the Gowing method, and its calculation formula is as follows:

[0080] Theoretical control efficacy E of the mixture 0 = weed control efficacy when the dosage of herbicide A is P + weed control efficacy when the dosage of herbicide B is Q - weed control efficacy when the dosage of herbicide A is P × weed control efficacy when the dosage of herbicide B is Q ÷ 100

[0081] Evaluation criteria for the combined action of the mixed chemicals:

[0082] E - E 0 > 10% is a synergistic effect, E - E 0 < -10% is an antagonistic effect, E - E 0 Between ±10% is an additive effect.

[0083] Test results:

[0084] Table 1 Test results of the indoor biological activity of the combination of isoxaben and florasulam against Galium aparine

[0085]

[0086]

[0087] Indoor test results show that when isoxaben and florasulam are compounded, it shows an additive or synergistic effect on Galium aparine L. within the range of mass ratio of 5:8 to 80:1; when the mass ratio of isoxaben to florasulam is within the range of 5:6 to 20:1, it shows a synergistic effect on Galium aparine L.

[0088] Table 2 Test results of indoor bioactivity determination of the compound of isoxaben and florasulam against Euphorbia helioscopia L.

[0089]

[0090] Indoor test results show that when isoxaben and florasulam are compounded, it shows an additive or synergistic effect on Euphorbia helioscopia L. within the range of mass ratio of 5:8 to 80:1; when the mass ratio of isoxaben to florasulam is within the range of 5:8 to 40:1, it shows a synergistic effect on Euphorbia helioscopia L.

[0091] Table 3 Test results of indoor bioactivity determination of the compound of isoxaben and flumetsulam against Veronica didyma Tenore

[0092]

[0093] Indoor test results show that when isoxaben and flumetsulam are compounded, it shows an additive or synergistic effect on Veronica didyma Tenore within the range of mass ratio of 1:16 to 16:1; when the mass ratio of isoxaben to flumetsulam is within the range of 1:16 to 8:1, it shows a synergistic effect on Veronica didyma Tenore.

[0094] Table 4 Test results of indoor bioactivity determination of the compound of isoxaben and flumetsulam against Cirsium setosum (Willd.) MB.

[0095]

[0096]

[0097] Indoor test results show that when isoxaben and flumetsulam are compounded, it shows a synergistic effect on Cirsium setosum (Willd.) MB. within the range of mass ratio of 1:16 to 16:1.

[0098] Test Example 2: Indoor Bioactivity Determination

[0099] Test basis: The test refers to NY / T 1155.5-2006 "Guidelines for Pesticide Bioassay in the Laboratory - Part 5: Soil Activity Determination Test for Paddy Herbicides".

[0100] Test targets: Leptochloa chinensis (L.) Nees, Eclipta prostrata (L.) L., Cyperus difformis L.

[0101] Test materials: Air-dried soil with organic matter content ≤ 2%, neutral pH, and sieved was filled to 3 / 4 of the pot, and then watered from the top of the pot to make the soil completely wet to the saturated state. The tested weed seeds were evenly and quantitatively sown on the soil surface, covered with soil of 0.5 cm - 2 cm according to the size of the seeds, and reserved 24 hours after sowing.

[0102] Test agents: Isoxaben original drug, penoxsulam original drug.

[0103] Agent preparation: The above original drugs were dissolved with a suitable solvent and then diluted with 0.1% Tween 80 aqueous solution.

[0104] Agent treatment: Watering was carried out before treatment to maintain a water layer of 1 cm - 2 cm. A quantitative agent was taken with a pipette and watered respectively from low dose to high dose according to the test design. Each treatment had 4 replicates, and a treatment without agent was set as a blank control. After treatment, the test materials were transferred to the greenhouse for cultivation, and a water layer of 1 cm - 2 cm was maintained throughout the test period.

[0105] Investigation: The herbicidal activity was investigated and recorded by the absolute value investigation method 14 days after treatment.

[0106] Calculation method:

[0107] Fresh weight control effect E = (fresh weight in the control area - fresh weight in the treatment area) × 100 / fresh weight in the control area

[0108] The determination method of the combined action of the mixture was adopted by the Gowing method, and its calculation formula was as follows:

[0109] Theoretical control effect E of the mixture 0 = Weed control effect when the dosage of herbicide A is P + Weed control effect when the dosage of herbicide B is Q - Weed control effect when the dosage of herbicide A is P × Weed control effect when the dosage of herbicide B is Q ÷ 100

[0110] Evaluation criteria for the combined action of the mixed agent:

[0111] E - E 0 > 10% is a synergistic effect, E - E 0 < -10% is an antagonistic effect, E - E 0 Between ±10% is an additive effect.

[0112] Test results:

[0113] Table 5 Test results of the indoor biological activity of the mixture of isoxaben and penoxsulam against Leptochloa chinensis

[0114]

[0115]

[0116] Indoor test results show that when isoxaben and penoxsulam are rationally compounded, it shows a synergistic effect on Leptochloa chinensis in the mass ratio range of 1:16 to 8:1.

[0117] Table 6 Test results of indoor bioactivity determination of the compound of isoxaben and penoxsulam against Eclipta prostrata

[0118]

[0119] Indoor test results show that when isoxaben and penoxsulam are rationally compounded, it shows a synergistic effect on Eclipta prostrata in the mass ratio range of 1:16 to 8:1.

[0120] Table 6 Test results of indoor bioactivity determination of the compound of isoxaben and penoxsulam against Cyperus difformis

[0121]

[0122] Indoor test results show that when isoxaben and penoxsulam are rationally compounded, it shows a synergistic effect on Cyperus difformis in the mass ratio range of 1:8 to 16:1.

[0123] Field efficacy example 3: Herbicidal efficacy control test in wheat field

[0124] The test field is located in a wheat field in Zhangzhaozhuang Village, Shundian Town, Yuzhou City, Henan Province. There are many types and quantities of weeds in the test field, and no herbicide was used in the previous crop.

[0125] The main weeds in the wheat field are: broad-leaved weeds such as Galium aparine, Descurainia sophia, Capsella bursa-pastoris, Veronica didyma, Stellaria media, and Lithospermum arvense.

[0126] Test design: All test plots are arranged in a randomized block design, with 8 treatments and 4 replicates, for a total of 32 plots. The area of each plot is 20m 2 .

[0127] Application equipment: A backpack-type Shandong Weishi ws-16 manual sprayer is used for spraying, with a water output of 0.5 - 0.6 L / min.

[0128] Application time and frequency: Spraying is carried out once in early December 2024, and the amount of weeds in each treatment plot is relatively large during spraying.

[0129] Efficacy investigation: The absolute value investigation method is adopted. Randomly take 4 points in each plot, with an area of 0.5m × 0.5m for each point. The number of plants of each type of weed is counted respectively 15 days and 30 days after spraying; the fresh weight of the above-ground part of the weeds is measured 30 days after spraying and its control effect is calculated.

[0130] Efficacy calculation formula:

[0131]

[0132]

[0133] Table 7 Results of the efficacy test of herbicides in wheat fields

[0134]

[0135] The results of the field efficacy test showed that 30 days after application, the seven agents had obvious control effects on weeds in wheat fields within the tested range. Preparation Example 10 of the compound preparation: 18% isoxaben amide·flumetsulam dispersible oil suspension concentrate (2:1), Preparation Example 9: 18% isoxaben amide·flumetsulam suspension concentrate (1:8), Preparation Example 4: 21% isoxaben amide·bifluoransulfuron wettable powder (20:1), and Preparation Example 1: 22% isoxaben amide·bifluoransulfuron suspension concentrate (5:6) had significant control effects on weeds in wheat fields.

[0136] Field Efficacy Example 4: Efficacy Test of Herbicides in Paddy Fields

[0137] Test site: The test was carried out in the direct-seeded paddy field of Wenjin Community, Jixian Town, Chongzhou City, Sichuan Province. The test field was loam with medium to high soil fertility. No other herbicides were applied during the test period, and there was no watering or fertilization management. The test conditions of each plot were basically the same.

[0138] Test crop: Rice.

[0139] Arrangement of test plots: A total of 5 treatments were set up in the test, each treatment was repeated 4 times, and the test plots were randomly arranged in blocks. The area of each test plot was 20 m 2 . Small ridges were built between plots to prevent water from flowing through.

[0140] Time and method of applying the drug: The test was applied with the drug once. The application time was June 12, 2024, and the rice was in the 2-3 leaf stage during application. A Gongnong-16 type knapsack sprayer was used for spraying. The drug was mixed with clear water according to the mass concentration designed in the test to form a liquid medicine, and sprayed evenly.

[0141] Investigation content and method: 20 days after applying the drug, the control effect of weeds on the plant number was investigated; 40 days after applying the drug, the control effect of weeds on the plant number and fresh weight was investigated. 4 points were investigated in each plot, and each point was 0.25 m 2 , and the number of plants or fresh weight of each type of weed was calculated respectively.

[0142] After applying the drug, investigate whether the rice is damaged. If the rice is damaged by the drug, accurately describe the symptoms of the rice damaged by the drug (growth inhibition, chlorosis, necrotic spots, deformity, etc.), and record in detail the damaged symptoms, the time to return to normal growth, and the effects on the tillering and plant height of the rice.

[0143] Before rice harvest, observe whether the maturity is delayed in the medicament treatment area. Measure the yield of each treatment area during harvest and calculate the yield increase rate.

[0144] Pharmacodynamic formula:

[0145]

[0146]

[0147] Table 8 Results of herbicidal efficacy control test in paddy fields

[0148]

[0149] According to visual observation, the safety of the target crops and surrounding crops in each medicament treatment is good, no phytotoxicity symptoms are seen, and there is no impact on non-target organisms.

[0150] Twenty days after spraying, the plant control efficacy was investigated. For Preparation Example 6: 15% isoxaben amide·penoxsulam dispersible oil suspension concentrate (1:1) and Preparation Example 8: 0.3% isoxaben amide·penoxsulam granule (1:2), with the active ingredient application rate of 22.5 g / ha, the plant control efficacy against weeds was between 88.75% and 91.70%. The control agents, 25 g / L penoxsulam dispersible oil suspension concentrate and 20% isoxaben amide emulsifiable concentrate, had relatively poor control efficacy against weeds, with the plant control efficacy being 74.45% and 70.32% respectively.

[0151] Forty days after spraying, the plant control efficacy was investigated. For Preparation Example 6: 15% isoxaben amide·penoxsulam dispersible oil suspension concentrate (1:1) and Preparation Example 8: 0.3% isoxaben amide·penoxsulam granule (1:2), with the active ingredient application rate of 22.5 g / ha, the plant control efficacy against weeds was between 90.04% and 94.13%. The control agents, 25 g / L penoxsulam dispersible oil suspension concentrate and 20% isoxaben amide emulsifiable concentrate, had relatively poor control efficacy against weeds, with the plant control efficacy being 80.65% and 78.64% respectively.

[0152] During rice harvest, the yields of each treatment area in the test were measured. For the test medicaments, Preparation Example 6: 15% isoxaben amide·penoxsulam dispersible oil suspension concentrate (1:1) and Preparation Example 8: 0.3% isoxaben amide·penoxsulam granule (1:2), with the active ingredient application rate of 22.5 g / ha, the rice maturity periods in the treatment areas were normal and consistent, and the yield increase was significant, with the yield increase rates being 33.84% and 31.50% respectively.

[0153] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made thereto, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A herbicidal composition, characterized in that The herbicidal composition contains active ingredient A and active ingredient B, wherein the active ingredient A is isoxasulfuron, and the active ingredient B is any one of bispyribac, penoxsulam, and flumetsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 80:

1.

2. The herbicidal composition according to claim 1, characterized in that The active ingredient B is florasulam, and the mass ratio of the active ingredient A to the active ingredient B is 5:8 to 40:1; The active ingredient B is penoxsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 16:1; The active ingredient B is flumetsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 16:

1.

3. The herbicidal composition according to claim 2, characterized in that The active ingredient B is florasulam, and the mass ratio of the active ingredient A to the active ingredient B is 5:6 to 20:1; The active ingredient B is penoxsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:8 to 8:1; The active ingredient B is flumetsulam, and the mass ratio of the active ingredient A to the active ingredient B is 1:16 to 8:

1.

4. The herbicidal composition according to claim 1, characterized in that The total weight of the herbicidal composition is 100 wt %, and the active ingredients in the herbicidal composition account for 0.01% to 70% of the total weight of the herbicidal composition.

5. The herbicidal composition according to claim 1, characterized in that The herbicidal composition can be prepared in the form of a solid preparation or a liquid preparation.

6. The herbicidal composition according to claim 5, characterized in that The solid preparation is water dispersible granules, wettable powders, and granules, and the liquid preparation is suspoemulsions and dispersible oil suspensions.

7. Use of the herbicidal composition according to any one of claims 1 to 6 for controlling weeds in crop fields.

8. The use according to claim 7, characterized in that: The crop fields are wheat fields, rice fields, corn fields or soybean fields.

9. The use according to claim 7, characterized in that: The weeds are grass weeds, broadleaf weeds or sedge weeds; The grass weeds are barnyard grass, Leptochloa chinensis, Digitaria sanguinalis, Goosegrass, and Paspalum distachyon; The broadleaf weeds are cleavers, magnolia officinalis, zelacryma-jobi, carp intestine, duckweed, sesbania, knotweed, veronica, pondweed, chickweed, shepherd's purse, Arabian veronica, sophora japonica, bottle grass, prickly lettuce, and Amaranthus retroflexus; The weeds of Cyperaceae are water chestnut, Cyperus difformis, Cyperus angustifolia and Cyperus rotundus.

10. The use according to claim 9, characterized in that: The grass weeds are Leptochloa chinensis; The broadleaf weeds are cleavers, lacquer, veronica, prickly lettuce, and Channa chus; The sedge weeds are sedge with a different shape.

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