A herbicidal composition and use thereof

Abstract

This invention belongs to the field of pesticide weeding technology, and discloses a weeding composition and its application. The weeding composition comprises active ingredient A and active ingredient B. Active ingredient A is isoxaflutole or its ester, and active ingredient B is propyzoxystrobin or oxadiazon. The mass ratio of active ingredient A to active ingredient B is 3:80 to 96:5. The weeding composition of this invention can effectively improve the control effect on weeds, has high safety for field crops, and meets the requirements of integrated weed control in rice fields.

Description

Technical Field

[0001] This invention belongs to the field of pesticide weeding technology, and discloses a weeding composition and its application. Background Technology

[0002] Propylene oxadiazon is a novel oxazole-based nitrogen-containing heterocyclic herbicide, mainly used for controlling annual weeds in rice, potatoes, sunflowers, vegetables, sugar beets, and orchards, with a wide range of applications. Its chemical structure is shown below:

[0003]

[0004] Oxalide is a nitrogen-containing heterocyclic herbicide mainly used for weed control in paddy fields, but also effective against peanuts, cotton, and sugarcane in dry fields; it is a contact pre-emergence and post-emergence herbicide. Its structural formula is shown below:

[0005]

[0006] In recent years, crop cultivation has gradually moved towards mechanization and simplification. Weed control generally relies on chemical methods, and long-term chemical weeding has led to weeds developing resistance to some herbicides. The cross-regional operation of mechanized farming, environmental factors, climate factors, and seed transportation can all affect the dominant weed populations in paddy fields, potentially leading to a year-on-year increase in dominant weeds. The difficulty and high cost of weed control increase the cost of rice production, thus necessitating the continuous updating of herbicides and optimization of weed control programs to improve weed management in paddy fields. Field control generally combines agricultural and chemical control to reduce the weed population and control its growth. New herbicides are constantly being developed, and different herbicide mixing schemes are continuously being updated to address weed resistance and herbicide damage issues in the field. Summary of the Invention

[0007] Based on the above, the present invention provides a herbicidal composition that can effectively improve the control effect on weeds, has high safety for field crops, and meets the requirements of integrated weed control in rice fields.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a herbicidal composition comprising active ingredient A and active ingredient B, wherein active ingredient A is isoxaflutole or isoxaflutole methyl ester, and active ingredient B is any one of propyzoxystrobin or oxadiazon, wherein the mass ratio of active ingredient A to active ingredient B is 3:80 to 96:5.

[0009] Furthermore, the mass ratio of isoxaflutole to propyzine is 3:10 to 72:5;

[0010] The mass ratio of isoxaflutole to oxadiazon is 3:40 to 24:5;

[0011] The mass ratio of isoxaflutole methyl ester to propyzine oxaflutole is 3:10 to 96:5;

[0012] The mass ratio of isoxaflutole methyl ester to oxadiazon is 3:40 to 24:5.

[0013] Furthermore, the mass ratio of isoxaflutole to propyzine is 3:10 to 24:5;

[0014] The mass ratio of isoxaflutole to oxadiazon is 3:40 to 18:5;

[0015] The mass ratio of isoxaflutole methyl ester to propyzine oxaflutole is 3:5 to 72:5;

[0016] The mass ratio of isoxaflutole methyl ester to oxaflutole is 3:20 to 18:5.

[0017] Furthermore, the total weight of the herbicidal composition is 100 wt%, and the active ingredient accounts for 1% to 80% of the total weight of the herbicidal composition;

[0018] Furthermore, the active ingredient accounts for 1% to 40% of the total weight of the herbicidal composition, based on a total weight of 100 wt%.

[0019] Furthermore, the herbicidal composition contains other auxiliary ingredients in addition to the active ingredients, and the auxiliary ingredients are selected from one or more of the following: wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, or carriers.

[0020] Furthermore, the herbicidal composition is prepared into a pesticide-permitted formulation, wherein the formulation is a solid or liquid formulation.

[0021] Furthermore, the solid formulation is a water-dispersible granule or a wettable powder; the liquid formulation is an emulsifiable concentrate, a water-in-oil emulsion, a microemulsion, a dispersible oil suspension, or a suspension emulsion.

[0022] The present invention also discloses the application of the herbicidal composition described above for controlling weeds in rice paddies.

[0023] Furthermore, the weeds are annual weeds, specifically grass weeds, broadleaf weeds, or sedge weeds.

[0024] Furthermore, the grassy weeds are barnyard grass, barnyardgrass, double-spike barnyardgrass, crabgrass, goosegrass, purslane, and foxtail grass; the broadleaf weeds are duckweed, arrowhead, angelica, jointed greens, knotweed, water peanut, and pondweed; and the sedges are sedge, rice sedge, and nutgrass.

[0025] The beneficial effects of this invention are as follows:

[0026] The herbicidal composition of this invention has a synergistic effect on a variety of weeds in paddy fields, achieving a weeding effect comparable to that of a single component with a lower application rate; it broadens the weeding spectrum, covering more types of weeds and reducing dependence on single herbicides; while reducing the amount of herbicide used, it can effectively improve the actual control effect, controlling multiple weeds at once, reducing labor costs and time investment, and lowering costs; the herbicidal composition of this invention is safe for subsequent crops and is an excellent herbicide for paddy fields. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the formulation preparation examples and specific examples. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] The preparation examples prepared below have all met the quality and technical indicators required for the corresponding preparations after testing, and the resulting preparations are qualified preparations recognized in this field.

[0029] Preparation method of formulation example:

[0030] 1. Water-dispersible granules: According to the formula ratio, the active ingredients are added to the carrier, and surfactants and other functional additives are added to it. After mixing, the mixture is pulverized by air jet and 10-25% water is added. Then, the mixture is kneaded, granulated, dried and sieved to obtain the water-dispersible granule product; or the pulverized powder is sprayed with water, granulated and dried in a fluidized bed granulator, and then sieved to obtain the product.

[0031] 2. Wettable powder: According to the formula ratio, the active ingredients, dispersant, wetting agent and filler are mixed and stirred evenly in a mixing tank. The mixture is then pulverized and mixed evenly multiple times by an air jet mill to prepare the wettable powder of the composition of the present invention.

[0032] 3. Emulsifiable concentrate: According to the formula ratio, add the active ingredient, solvent, and co-solvent into the mixing tank and stir to dissolve them. Then add the emulsifier, and use the remaining solvent to make up the balance. Stir evenly in the mixing tank, and filter to obtain the emulsifiable concentrate required by the present invention.

[0033] 4. Dispersible oil suspension: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reaction vessel in sequence, mixed evenly with oil, and then subjected to high-speed shearing, wet sand milling, and finally homogenized filtration to obtain the dispersible oil suspension product.

[0034] 5. Water-in-water emulsion: Dissolve the active ingredients in the solvent according to the formula ratio, add the emulsifier to form a uniform oil phase, mix deionized water, antifreeze, etc. together to form a uniform aqueous phase; under high-speed shearing, add the oil phase to the aqueous phase, shear until the particle size is qualified, add defoamer, thickener, and preservative and stir evenly to form a well-dispersed water-in-water emulsion product.

[0035] 6. Microemulsion: According to the formula ratio, the active ingredients, solvents, emulsifiers, etc. are mixed evenly to obtain the oil phase. The antifreeze and water are mixed evenly to obtain the aqueous phase. The oil phase is added to the aqueous phase under stirring and stirred evenly. Shearing is continued for 10 minutes. Then, the defoamer is added and stirred evenly to obtain small droplets with oil phase particles of 0.01 to 0.1 micrometers, which is the microemulsion product.

[0036] Preparation Example 1: 34% isoxaflutamide·oxadiazon water-dispersible granules (12:5)

[0037] Formula composition: 24% isoxaflutole, 10% oxadiazon, 8% sodium lignosulfonate, 2.5% BX (a type of lignosulfonate), 1.5% sodium dodecylbenzenesulfonate, 5% white sugar, 6% naphthalenesulfonate formaldehyde condensate, and kaolin to make up the balance.

[0038] Preparation Example 2: 11% isoxaflutole·oxadiazon EC (6:5)

[0039] Formula composition: 6% isoxaflutole, 5% oxadiazon, 15% DMF, 14% styrene-phenol polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 20% propylene carbonate, xylene to make up the balance.

[0040] Preparation Example 3: 24% Isoxaflutamide·Oxalide Wettable Powder (3:5)

[0041] Formula composition: 9% isoxaflutole, 15% oxadiazon, 2% sodium dodecyl sulfate, 5% alkyl naphthalene sulfonate, 6% sodium polynaphthalene sulfonate, 10% kaolin, 10% silica, and bentonite to make up the balance.

[0042] Preparation Example 4: 16% isoxaflutole methyl ester·oxadiazon emulsifiable concentrate (3:5)

[0043] Formula composition: 6% isoxaflutole methyl ester, 10% oxaflutole, 20% N-methylpyrrolidone, 14% alkylphenol polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 10% DMF, and methyl oleate to make up the balance.

[0044] Preparation Example 5: 13% isoxaflutole methyl ester·oxadiazon aqueous emulsion (3:10)

[0045] Formula composition: 3% isoxaflutole methyl ester, 10% oxaflutole, 3% glyceryl fatty acid ester polyoxyethylene ether, 3% polyoxyethylene dehydrated sorbitan monooleate, 15% cyclohexanone, 0.1% xanthan gum, 0.1% isothiazolinone, 5% glycerol, 1.5% urea, 0.5% sodium sorbate, 0.1% silicone defoamer, deionized water to make up the balance.

[0046] Preparation Example 6: 11% isoxaflutamide methyl ester·oxadiazon microemulsion (6:5)

[0047] Formula composition: 6% isoxaflutamide methyl ester, 5% oxaflutole, 20% cyclohexanone, 15% tristyrene-phenylphenol polyoxyethylene ether, 2% dehydrated sorbitol polyoxyethylene ether, 1% fatty alcohol polyoxyethylene ether sulfate, 0.05% silicone defoamer, deionized water to make up the balance;

[0048] Preparation Example 7: 22% isoxaflutole·propycinoxaflutole water-dispersible granules (6:5)

[0049] Formula composition: 12% isoxaflutole, 10% propyzamide, 8% sodium lignosulfonate, 3% BX (a type of lignosulfonate), 1.5% sodium dodecylbenzenesulfonate, 8% glucose, 6% naphthalenesulfonate formaldehyde condensate, 10% starch, and kaolin to make up the balance.

[0050] Preparation Example 8: 32% isoxaflutole·propycinoxaflutole wettable powder (3:5)

[0051] Formula composition: 12% isoxaflutole, 20% propyzamide, 2% sodium dodecyl sulfate, 3% sodium lignosulfonate, 5% naphthalene sulfonate, 5% sodium polynaphthalene sulfonate, 10% kaolin, 10% silica, bentonite to make up the balance;

[0052] Preparation Example 9: 17% isoxaflutole·propycinoxaflutole EC (5:12)

[0053] Formula composition: 5% isoxaflutole, 12% propyzamide, 12% DMF, 10% tristyrene-phenol polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 15% propylene carbonate, and thallium to make up the balance.

[0054] Preparation Example 10: 14.5% isoxaflutole methyl ester·propycinoxaflutole dispersible oil suspension (24:5)

[0055] Formula composition: 12% isoxaflutole methyl ester, 2.5% propyzamide, 1% naphthalene sulfonate formaldehyde condensate, 5% triphenylethylphenol polyoxyethylene ether, 15% castor oil polyoxyethylene ether, 2% calcium dodecylbenzene sulfonate, 1% silica, 1% organic bentonite, soybean oil to make up the balance;

[0056] Preparation Example 11: 11% isoxaflutole methyl ester·propyneoxadiazon microemulsion (6:5)

[0057] Formula composition: 6% isoxaflutole methyl ester, 5% propyzamide, 20% cyclohexanone, 15% tristyrene-phenylphenol polyoxyethylene ether, 3% sorbitan oleate polyoxyethylene ether, 1% styrene-phenol polyoxyethylene ether sulfate, 1% calcium dodecylbenzenesulfonate, 0.05% silicone defoamer, deionized water to make up the balance;

[0058] Preparation Example 12: 8.5% isoxaflutole methyl ester·propyneoxadiazon aqueous emulsion (5:12)

[0059] Formula composition: 2.5% isoxaflutole methyl ester, 6% propyzamide methyl ester, 8% phenylethylphenol polyoxyethylene polyoxypropylene ether, 1% fatty alcohol polyoxyethylene ether sodium sulfate, 20% cyclohexanone, 0.2% xanthan gum, 5% ethylene glycol, 0.1% sodium benzoate, 0.02% silicone oil, deionized water to make up the balance.

[0060] Example 1: Indoor weed control bioactivity test

[0061] Test basis: The test refers to NY / T 1155.5-2006 "Guidelines for Indoor Bioassay Tests of Pesticides - Herbicides Part 5: Soil Activity Test of Herbicides in Paddy Fields - Irrigation Method".

[0062] Experimental targets: barnyard grass, crabgrass, dwarf arrowhead, eclipta prostrata, rice sedge, and sedge.

[0063] Test reagents: isoxaflutole technical, isoxaflutole methyl ester technical, propyzoxystrobin technical, and oxadiazon technical.

[0064] Preparation of the drug: Dissolve the above raw materials in a suitable solvent, and then dilute with a 0.1% Tween 80 aqueous solution.

[0065] Experimental Method: Six types of weed seeds were sown separately in plastic pots (9cm in diameter), each filled with 3 / 5 sieved fine soil. The weed seeds were thoroughly mixed with the fine soil before being sown in the plastic pots. Water was slowly added through the side of the pot to create a 2cm water layer. 1ml of each concentration of pesticide solution was pipetted into the pot. The treated plastic pots were placed in a light incubation chamber (27℃, light / dark cycle 16h / 8h), and water was added every other day to maintain a water layer of approximately 1.5cm. The experiment was repeated four times, with one plastic pot per replicate.

[0066] Survey: Herbicidal activity was investigated and recorded using the absolute value survey method 21 days after treatment.

[0067] Calculation method: Control efficacy E = (Number of weeds in the control area - Number of weeds in the treatment area) × 100 / Number of weeds in the control area

[0068] The combined effects of the mixtures were determined using the Gowing method, and the calculation formula is as follows:

[0069] Theoretical control efficacy of the mixture E0 = Weed control efficacy of herbicide A at dosage P + Weed control efficacy of herbicide B at dosage Q - Weed control efficacy of herbicide A at dosage P × Weed control efficacy of herbicide B at dosage Q ÷ 100

[0070] Evaluation criteria for the combined effects of mixed drugs:

[0071] E-E0 > 10% indicates a synergistic effect, E-E0 < -10% indicates an antagonistic effect, and E-E0 between ±10% indicates an additive effect.

[0072] Experimental results:

[0073] Table 1: Results of the indoor bioactivity assay of isoxaflutole and oxadiazon combination on barnyardgrass

[0074]

[0075] Table 1 shows that the combination of isoxaflutole and oxadiazon at an appropriate mass ratio has a good control effect on barnyardgrass. When the mass ratio of isoxaflutole to oxadiazon is 3:80–24:5, the E-E0 is greater than -10%, indicating an additive or synergistic effect. When the mass ratio of isoxaflutole to oxadiazon is 3:40–24:5, the E-E0 is greater than 10%, also indicating a synergistic effect. The synergistic effect is most significant when the mass ratio of isoxaflutole to oxadiazon is 12:5.

[0076] Table 2: Results of indoor bioactivity tests of isoxaflutole and oxadiazon combination on Sagittaria pyrifos.

[0077]

[0078] Table 2 shows that the combination of isoxaflutole and oxadiazon at an appropriate mass ratio effectively controls the broadleaf weed *Sagittaria sagittifolia*. A mass ratio of isoxaflutole to oxadiazon of 3:80–24:5 with an E-E0 greater than -10% indicates an additive or synergistic effect. A mass ratio of isoxaflutole to oxadiazon of 3:40–18:5 with an E-E0 greater than 10% also indicates a synergistic effect. The synergistic effect is most significant when the mass ratio of isoxaflutole to oxadiazon is 6:5.

[0079] Table 3: Results of indoor bioactivity tests of isoxaflutole and propyoxaflutole combination on *Symplocos chinensis*

[0080]

[0081]

[0082] Table 3 shows the results of the indoor experiments. It is evident that combining isoxaflutole and propyzoxystrobin at an appropriate mass ratio effectively controls the sedge weed *Cyperus difformis*. A mass ratio of isoxaflutole to propyzoxystrobin of 3:20–96:5, with an E-E0 greater than -10%, indicates an additive or synergistic effect. A mass ratio of isoxaflutole to propyzoxystrobin of 3:10–72:5, with an E-E0 greater than 10%, also indicates a synergistic effect. The synergistic effect is most significant when the mass ratio of isoxaflutole to propyzoxystrobin is 6:5.

[0083] Table 4: Results of Indoor Bioactivity Tests of the Combination of Isoxaflutole and Propyoxaflutole on Digitaria rubra

[0084]

[0085] Table 4 shows the results of the indoor experiments. It is evident that combining isoxaflutole methyl ester and propyzoxystrobin at an appropriate mass ratio effectively controls the grassy weed *Digitaria sanguinalis*. A mass ratio of isoxaflutole methyl ester to propyzoxystrobin of 3:20–96:5, with an E-E0 greater than -10%, indicates an additive or synergistic effect. A mass ratio of isoxaflutole methyl ester to propyzoxystrobin of 3:10–96:5, with an E-E0 greater than 10%, also indicates a synergistic effect. The synergistic effect is most significant when the mass ratio of isoxaflutole methyl ester to propyzoxystrobin is 24:5.

[0086] Table 5: Results of in vitro bioactivity assay of isoxaflutole methyl ester and propyoxaflutole in snake intestine

[0087]

[0088] Table 5 shows the results of the indoor experiments. It is evident that combining isoxaflutole methyl ester and propyzoxystrobin at an appropriate mass ratio effectively controls the broadleaf weed *Eclipta prostrata*. A mass ratio of isoxaflutole methyl ester to propyzoxystrobin of 3:20–96:5, with an E-E0 greater than -10%, indicates an additive or synergistic effect. A mass ratio of isoxaflutole methyl ester to propyzoxystrobin of 3:10–96:5, with an E-E0 greater than 10%, also indicates a synergistic effect. The synergistic effect is most significant when the mass ratio of isoxaflutole methyl ester to propyzoxystrobin is 6:5.

[0089] Table 6: Results of Indoor Bioactivity Tests of the Combination of Isoxaflutole and Oxalide on Cyperus rotundus

[0090]

[0091]

[0092] Table 6 shows the results of the indoor experiments. It is evident that combining isoxaflutole methyl ester and oxadiazon at an appropriate mass ratio effectively controls the sedge weed *Cyperus difformis*. When the mass ratio of isoxaflutole methyl ester to oxadiazon is 3:80–24:5, with an E-E0 greater than -10%, an additive or synergistic effect is observed. When the mass ratio of isoxaflutole methyl ester to oxadiazon is 3:40–24:5, with an E-E0 greater than 10%, a synergistic effect is also observed. The synergistic effect is most significant when the mass ratio of isoxaflutole methyl ester to oxadiazon is 3:5.

[0093] Example 2: Field efficacy test for controlling weeds in rice paddies

[0094] Experimental site: Wangdian Village, Kongcheng Town, Tongcheng City, Anhui Province. The soil at the experimental site was magan mud soil with medium to high fertilizer content.

[0095] Experimental rice variety: Yexiang Youhang 1573.

[0096] Experimental Design: The experiment consisted of 9 treatments, each with 4 replicates, arranged in a randomized block design, with a plot size of 25m². 2 .

[0097] Experimental Methods: Four days before rice transplanting, after the paddy fields were irrigated, leveled, and allowed to settle, pesticides were applied. The pesticide dosage for each treatment group was calculated according to the set dosage. The application equipment was a German SOLO 425LC manual backpack sprayer, with the spray nozzle removed for spraying. The water volume was 150 kg / hm². 2 After applying the pesticide, maintain a water layer of 3-5 cm in the field for 5-7 days.

[0098] Experimental survey: Following the experimental guidelines of "Field Efficacy Test Guidelines for Pesticides (I): Herbicide Control of Weeds in Rice Fields" (GB / T 17980.40—2000), four small points were randomly selected from each plot, each 0.25m in diameter. 2 The number of weeds was investigated 15 days after application, and the fresh weight of the weeds was also investigated 45 days after application.

[0099]

[0100] Safety survey: Observe the growth of rice seedlings periodically and record any pesticide damage. Measure yield at harvest and calculate the yield increase rate.

[0101]

[0102] Results and Analysis:

[0103] Table 7: Comparison of weed control efficacy among different treatments 15 days after application.

[0104]

[0105] Table 8: Comparison of control efficacy of different treatments at 45 days after application (weed count / fresh weight)

[0106]

[0107] Table 9: Effects of each treatment on rice yield

[0108] deal with Dosage of active ingredient (g / hectare) <![CDATA[Average yield (kg / hm 2 )]]> Production increase rate (%) Preparation Example 2: 11% isoxaflutole·oxadiazon EC (6:5) 100 8578.95 18.20 Preparation Example 5: 13% isoxaflutole methyl ester·oxadiazon aqueous emulsion (3:10) 100 8442.15 16.32 Preparation Example 11: 11% isoxaflutole methyl ester·propyneoxadiazon microemulsion (6:5) 70 8641.57 19.06 Preparation Example 9: 17% isoxaflutole·propycinoxaflutole EC (5:12) 70 8417.79 15.98 250g / L Oxadiazon EC 375 7984.76 10.02 80% Propylene Oxadiazon Water Dispersible Granules 75 8126.41 11.97 25% Isoxaflutole Dispersible Oil Suspension 140 7849.82 8.16 20% isoxaflutamide methyl ester emulsifiable concentrate 120 8041.57 10.80 Blank control / 7257.88 /

[0109] At 15 days post-application, the total herbicide control efficacy of the following preparations was 89.50%, 86.26%, 90.87%, and 86.11%, respectively: Preparation Example 2: 11% isoxaflutole·oxadiazon EC (6:5), Preparation Example 5: 13% isoxaflutole methyl ester·oxadiazon A Emulsion (3:10), Preparation Example 11: 11% isoxaflutole methyl ester·propyneoxadiazon Microemulsion (6:5), and Preparation Example 9: 17% isoxaflutole·propyneoxadiazon EC (5:12) (see Table 7).

[0110] At 45 days post-application, the total herbicide control efficacy of the following treatments was 92.48%, 90.14%, 93.03%, and 88.84% for Preparation Example 2 (11% isoxaflutole·oxadiazon EC, 6:5), 93.03% for Preparation Example 5 (13% isoxaflutole methyl ester·oxadiazon ADI, 3:10), 93.03% for Preparation Example 11 (11% isoxaflutole methyl ester·propyneoxadiazon microemulsion, 6:5), and 88.84% for Preparation Example 9 (17% isoxaflutole·propyneoxadiazon EC, 5:12), respectively, and the total herbicide control efficacy was 93.76%, 90.95%, 93.23%, and 89.73% for total fresh herbicide weight (see Table 8), respectively, which were significantly higher than those of the other treatment groups.

[0111] After rice transplanting, observations were conducted periodically. No phytotoxicity was observed in the rice seedlings under any of the treatments, and seedling growth was normal, with no significant difference compared to the control group. This indicates that the treatments were safe for rice growth at the dosages used in this experiment. Yield data (Table 9) showed that each treatment exhibited a certain yield increase compared to the blank control group. The compound formulation treatments yielded 8578.95, 8442.15, 8641.57, and 8417.79 kg / hm², respectively. 2 The yield increases were 18.20%, 16.32%, 19.06%, and 15.98%, respectively, all significantly higher than the yield increases of the control single-dose treatment group.

Claims

1. A herbicidal composition, characterized in that, The herbicidal composition comprises active ingredient A and active ingredient B, wherein active ingredient A is isoxaflutole or isoxaflutole methyl ester, and active ingredient B is either propyzine or oxaflutole. The mass ratio of isoxaflutole to propyzine is 3:10 to 72:5; The mass ratio of isoxaflutole to oxadiazon is 3:40 to 24:5; The mass ratio of isoxaflutole methyl ester to propyzine oxaflutole is 3:10 to 96:

5. The mass ratio of isoxaflutole methyl ester to oxadiazon is 3:40 to 24:

5.

2. The herbicidal composition according to claim 1, characterized in that, The mass ratio of isoxaflutole to propyzine is 3:10 to 24:5; The mass ratio of isoxaflutole to oxadiazon is 3:40 to 18:5; The mass ratio of isoxaflutole methyl ester to propyzine oxaflutole is 3:5 to 72:5; The mass ratio of isoxaflutole methyl ester to oxaflutole is 3:20 to 18:

5.

3. The herbicidal composition according to claim 1, characterized in that, The total weight of the herbicidal composition is 100 wt%, and the active ingredient accounts for 1% to 80% of the total weight of the herbicidal composition.

4. The herbicidal composition according to claim 1, characterized in that, The total weight of the herbicidal composition is 100 wt%, and the active ingredient accounts for 1% to 40% of the total weight of the herbicidal composition.

5. The herbicidal composition according to claim 1, characterized in that, In addition to the active ingredient, the herbicidal composition also contains other auxiliary ingredients, which are selected from one or more of the following: wetting agents, dispersants, emulsifiers, thickeners, disintegrants, antifreeze agents, defoamers, solvents, preservatives, stabilizers, synergists, or carriers.

6. The herbicidal composition according to claim 1, characterized in that, The herbicidal composition is prepared into a pesticide-permitted formulation, which may be a solid or liquid formulation.

7. The herbicidal composition according to claim 6, characterized in that, The solid formulation is a water-dispersible granule or a wettable powder; the liquid formulation is an emulsifiable concentrate, a water-in-oil emulsion, a microemulsion, a dispersible oil suspension, or a suspension emulsion.

8. The application of the herbicidal composition according to any one of claims 1-7 for the control of weeds in paddy fields, characterized in that, The weeds are grass weeds, broadleaf weeds, or sedge weeds; the grass weeds are barnyard grass and crabgrass; the broadleaf weeds are arrowhead and sedge; the sedge weeds are sedge and sedge.

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