Compound weeding composition containing flumioxazin and mesotrione

Abstract

The invention provides a compound weeding composition containing flumioxazin and mesotrione, and relates to the technical field of pesticides, the compound weeding composition provided by the invention combines metolachlor or butachlor, mesotrione and flumioxazin, and the inventor finds that through a large number of tests, the compound weeding composition has the advantages that the compound weeding composition has the effect of preventing and treating flumioxazin and mesotrione; the herbicides with different action mechanisms and herbicide controlling spectrums have a synergistic effect after combined action, the herbicide controlling spectrum is expanded, the residual period of the three herbicides is short, next-stubble crops are not affected, and crop rotation is facilitated. Under different proportions, the weeding composition can be used in sorghum fields, corn fields and the like, new pesticides and selection ways are added for weed prevention and control, the pesticide application amount is reduced, and sustainable development of agriculture is promoted.

Description

[0001] This application is a divisional application of the original application, whose application number is 202311266618.8 and whose application date is September 28, 2023. The invention title of the original application is "A compound herbicide and its preparation method and application". Technical Field

[0002] This invention relates to the field of pesticide technology, and in particular to a compound herbicidal composition containing propyne flumetsulam and mesotrione. Background Technology

[0003] Sorghum (sorghum bicolor) is sensitive to most herbicides, easily causing phytotoxicity, which is a major bottleneck restricting its production. Currently, compared to nearly 2,000 registered herbicides for corn fields, only 8 are registered pre-emergence soil-sealing agents for sorghum fields, 6 of which use atrazine as the main active ingredient. Due to the large dosage of atrazine and its increasingly prominent harm to the ecology, environment, and agricultural product quality, the development of agents to replace atrazine or atrazine combinations has become a major direction in the research and development of weed control agents for farmland. Related trials have been conducted in sorghum and corn fields.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] One of the main objectives of this invention is to provide a compound herbicide containing propyne fluroxypyr and mesotrione, so as to at least solve one of the technical problems existing in the prior art.

[0006] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted:

[0007] This invention provides a compound herbicide containing propyne flumetsulam and mesotrione, wherein the compound herbicide comprises the following (a) to (c):

[0008] (a) Metolachlor or butachlor;

[0009] (b) nicosulfuron;

[0010] (c) Propylene fluroxypyr.

[0011] Furthermore, (a) is metolachlor;

[0012] Preferably, the compound herbicide comprises isopropyl alachlor, propyzoxystrobin, and mesotrione in a mass ratio of 70–110:3–4:10–30, more preferably in a mass ratio of 70–110:3–4:10, and even more preferably in a mass ratio of 110:4:10.

[0013] Furthermore, the application rate of the compound herbicide is 1004.4–1339.2 g ai / hm. 2 .

[0014] Furthermore, the formulation of the compound herbicide includes a suspension emulsion;

[0015] Preferably, the suspension emulsion comprises, by weight, 33 parts of isopropylmetribazine, 1.2 parts of propyzoxystrobin, 3 parts of mesotrione, 15-18 parts of emulsifier, 0.5-2 parts of dispersant, 0.5-2.5 parts of suspending agent, and the balance being water.

[0016] Furthermore, (a) is butachlor;

[0017] Preferably, the compound herbicide comprises butachlor, propyzamide, and mesotrione in a mass ratio of 80–120:3–4:10–30, more preferably in a mass ratio of 80–120:3–4:10, and even more preferably in a mass ratio of 120:4:10.

[0018] Furthermore, the application rate of the compound herbicide is 1025.1–1386.9 g ai / hm. 2 .

[0019] Furthermore, the formulation of the compound herbicide includes a suspension emulsion;

[0020] Preferably, the suspension emulsion comprises, by weight, 36 parts butachlor, 1.2 parts propyzamide, 3 parts mesotrione, 15-18 parts emulsifier, 0.5-2 parts dispersant and / or spreading agent, 0.5-2.5 parts suspending agent, and the balance being water.

[0021] This invention also provides the application of the above-mentioned compound herbicide in sorghum and corn fields;

[0022] Preferably, the application period for sorghum and corn fields is after sowing but before seedling emergence.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The compound herbicide provided by this invention combines amide herbicides, mesotrione, and propyzoxystrobin. Through extensive experimentation, the inventors discovered that these herbicides, with their different mechanisms of action and weed-killing spectra, not only exhibit synergistic effects when combined, but also broaden the weed-killing spectrum. Furthermore, all three have short residual periods, do not affect subsequent crops, and facilitate crop rotation. Under different formulations, it can be used in sorghum fields, corn fields, etc., providing new agents and options for weed control, reducing pesticide application rates, and promoting sustainable agricultural development. Detailed Implementation

[0025] Unless otherwise defined herein, the scientific and technical terms used in conjunction with this invention shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any event of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.

[0026] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The research team of this invention conducted extensive research on the occurrence of weeds in sorghum and other crop fields, gaining a basic understanding of the occurrence and severity of weeds in sorghum fields. Combined with the research content of ongoing projects, the team completed the relevant experimental verification for this invention. In terms of herbicide screening, among pre-emergence soil-applied herbicides, a preliminary screening of over 1000 herbicides was conducted based on their pesticide mechanisms, prioritizing high activity and low residue. Further screening was then conducted based on their safety for crops such as sorghum. Combining the herbicidal spectrum and application techniques, indoor safety tests, combined activity tests, formulation exploration tests, and field efficacy tests were conducted. The optimal formulation, dosage form, and application method of the herbicide were preliminarily determined, and the following technical solution is proposed:

[0028] According to one aspect of the present invention, a compound herbicide containing propyne flumetsulam and mesotrione is provided, the compound herbicide comprising the following (a) to (c):

[0029] (a) Metolachlor or butachlor;

[0030] (b) nicosulfuron;

[0031] (c) Propylene fluroxypyr.

[0032] The compound herbicide provided by this invention combines amide herbicides, mesotrione, and propyzoxystrobin. Through extensive experimentation, the inventors discovered that these herbicides, with their different mechanisms of action and weed-killing spectra, not only exhibit synergistic effects when combined, but also broaden the weed-killing spectrum. Furthermore, all three have short residual periods, do not affect subsequent crops, and facilitate crop rotation. Under different formulations, it can be used in sorghum fields, corn fields, etc., providing new agents and options for weed control, reducing pesticide application rates, and promoting sustainable agricultural development.

[0033] The mass ratio of metolachlor, nicosulfuron, and propyzoxystrobin can be 70–110:3–4:10–30, for example, but not limited to 70:3:10, 110:4:30, 80:3:20, 90:4:18, 100:3.5:35, etc. Under these ratios, no antagonistic effect was observed in the herbicides; they exhibited additive or synergistic effects, while simultaneously broadening the weed-killing spectrum. Among the various mixture ratios, the combination of metolachlor, propyzoxystrobin, and nicosulfuron showed the most significant additive or synergistic effect on barnyardgrass, amaranth, and velvetleaf when the ratio was (70–110):(3–4):10. This can be considered the optimal ratio range for mixing these three herbicides against the three weeds. Given that the dosage of nicosulfuron is higher than 120 g ai / hm, this ratio is considered optimal. 2 For the safety of sorghum, a ratio of 110:4:10 is preferred.

[0034] Optionally, the application rate of the compound herbicide is 1004.4–1339.2 g ai / hm. 2 For example, it could be, but is not limited to, 1004.4 g ai / hm 2 1100g ai / hm 2 1200g ai / hm 2 1300ga.i. / hm 2 Or 1339.2ga.i. / hm 2 Verification by this invention has shown that when the dosage is within the above-mentioned range, pre-emergence soil spraying after sowing has a high control effect on annual weeds.

[0035] In practical application, different formulations will have different effects on the efficacy of compound herbicides. Based on the above ratios, this invention screened wettable powders, suspension emulsions, and water-dispersible granules using suspension rate and thermal storage stability as indicators. The screening results showed that suspension emulsions were more ideal. Specifically:

[0036] 37.2% metolachlor·propyzoxystrobin·nicosulfuron SE (110∶4∶10), the adjuvant ratio of SE was further optimized and determined to be as follows:

[0037] Based on 100 parts by weight, it includes: 33 parts isopropylmetribazine, 1.2 parts propyzoxystrobin, 3 parts mesotrione, 15-18 parts emulsifier (agricultural emulsion 600, 602), 0.5-2.0 parts dispersant (OP-10, NP-10, NNO), 0.5-2.5 parts suspending agent (xanthan gum), and the remainder is made up with water.

[0038] Further optimization yielded 33 parts isopropylmetribazine, 1.2 parts propyzoxystrobin, 3 parts mesotrione, 15 parts emulsifier (agricultural emulsion 600), 2.0 parts dispersant (OP-10), 0.8 parts suspending agent (0.2 parts xanthan gum, 0.6 parts soluble starch), with the remainder to be made up with water.

[0039] The processing flow of the suspension emulsion can be as follows: First, add the measured amount of nicosulfuron and propyzamide with an appropriate amount of water to a sand mill for sand milling. After the raw material powder particles are smaller than 45μm, open the discharge valve and enter the shear mixer. Add some adjuvants and stir. On the other hand, put isopropyl alachlor and the corresponding adjuvants into another shear mixer for thorough shearing and stirring. After the properties are stable, put the two into the same shear mixer, and at the same time add other adjuvants (emulsifiers, dispersants, spreading agents, suspending agents, developing agents, etc.). Perform high-speed shearing. After the physicochemical properties are stable, enter the mixing tank, stir evenly, open the bottom valve of the mixing tank, add the suspension emulsion to the filter for filtration, transfer the filtered suspension emulsion to the suspension storage tank, let it stand, and after natural defoaming, take a sample for testing. After passing the test, send it to the suspension packaging machine for packaging.

[0040] In another alternative embodiment, the compound herbicide includes butachlor, mesotrione, and propyzoxystrobin.

[0041] The mass ratio of butachlor, mesotrione, and propyzoxystrobin can be 80–120:3–4:10–30, for example, but not limited to 80:3:10, 120:4:30, 90:3:15, 100:4:20, 110:3.5:25, etc. Under the above ratios, no antagonistic effect was observed in the herbicide combination, showing additive or synergistic effects, while also broadening the weed control spectrum. Among the various ratios of the mixture, the combination of butachlor, propyzoxystrobin, and mesotrione at (80–120):(3–4):10 showed the most significant additive or synergistic effect on barnyardgrass, amaranth, and velvetleaf, and can be considered as the optimal ratio range for the three weeds. Given that the dosage of mesotrione is higher than 120 g ai / hm, 2 For the safety of sorghum, a ratio of 120:4:10 is preferred.

[0042] Optionally, the application rate of the compound herbicide is 1025.1–1386.9 g ai / hm. 2 For example, it could be, but is not limited to, 1025.1 g ai / hm 2 1100g ai / hm 2 1200g ai / hm 2 1300ga.i. / hm 2 Or 1386.9ga.i. / hm 2Verification by this invention has shown that when the dosage is within the above-mentioned range, pre-emergence soil spraying after sowing has a high control effect on annual weeds.

[0043] In practical application, different formulations will have different effects on the efficacy of compound herbicides. Based on the above ratios, this invention screened wettable powders, suspension emulsions, and water-dispersible granules using suspension rate and thermal storage stability as indicators. The screening results showed that suspension emulsions were more ideal. Specifically:

[0044] 40.2% butachlor·propyzoxystrobin·nicosulfuron SE (120∶4∶10), the adjuvant ratio of SE was further optimized and determined to be as follows:

[0045] The product comprises, by weight, 36 parts butachlor, 1.2 parts propyzamide, 3 parts mesotrione, 15-18 parts emulsifier (agricultural emulsion 600, 602), 0.5-2.0 parts dispersant / spreading agent (OP-10, NP-10, NNO), 0.5-2.5 parts suspending agent (xanthan gum, soluble starch), with the remainder to be made up with water.

[0046] Further optimization yielded 36 parts butachlor, 1.2 parts propyzamide, 3 parts mesotrione, 15 parts emulsifier (agricultural emulsion 600), 2.0 parts dispersant (NNO), 0.8 parts suspending agent (0.3 parts xanthan gum + 0.5 parts soluble starch), with the remainder to be made up with water.

[0047] The processing flow of the suspension emulsion can be as follows: First, add the measured amount of nicosulfuron-methyl and propyzamide with an appropriate amount of water to a sand mill for sand milling. After the raw material powder particles are smaller than 45μm, open the discharge valve and enter the shear mixer. Add some adjuvants and stir. On the other hand, put butachlor and the corresponding adjuvants into another shear mixer for thorough shearing and stirring. After the properties are stable, put the two into the same shear mixer, and at the same time add other adjuvants (emulsifiers, dispersants, spreading agents, suspending agents, developing agents, etc.). Perform high-speed shearing. After the physicochemical properties are stable, enter the mixing tank, stir evenly, open the bottom valve of the mixing tank, add the suspension emulsion to the filter for filtration, transfer the filtered suspension emulsion to the suspension storage tank, let it stand, and after natural defoaming, take a sample for testing. After passing the test, send it to the suspension packaging machine for packaging.

[0048] Based on the beneficial effects of the compound herbicide provided by the present invention, another aspect of the present invention also provides the application of the above-mentioned compound herbicide in weeding in sorghum and corn fields;

[0049] Preferably, the dryland application period is after sowing but before seedling emergence.

[0050] The present invention will be further illustrated by the following examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or purchased directly from the market.

[0051] Example 1: Metolachlor / Butachlor + Propylenefluthrin + Mesotrione

[0052] (I) Safety test of sorghum

[0053] Safety tests were conducted according to NY / T 1155.8-2007, and indoor toxicity tests were conducted according to industry standard NY / T1156.7-2006. Formulation screening tests used suspension rate and thermal storage stability as the main test indicators, and the specific procedures were carried out according to national standards. This application only lists the screening process for the applied-for pesticides; the eliminated combinations are not detailed here. Preliminary safety test results show that several pesticides, including metolachlor, butachlor, nicosulfuron, propyzoxystrobin, and propyzoxystrobin, have relatively high safety for sorghum within a certain range. Compared with metolachlor and butachlor, acetochlor and propyzoxystrobin have higher fresh weight inhibition rates and lower safety in sorghum.

[0054] Table 1. Statistical table of safety tests of several herbicides on sorghum.

[0055]

[0056]

[0057] (II) Screening of Compound Ratio

[0058] The screening test was conducted using the Colby method:

[0059] The theoretical fresh weight efficacy of each treatment combination was calculated and then compared with the measured efficacy (E) to evaluate the combined effect type of the herbicides on weeds. The theoretical fresh weight efficacy of the herbicides was calculated according to formula (1):

[0060]

[0061] In the formula:

[0062] X—the fresh weight efficacy of herbicide 1 at a dosage of P;

[0063] Y—the fresh weight efficacy of herbicide 2 at a dosage of Q;

[0064] Z—the fresh weight efficacy of herbicide 3 at a dosage of R;

[0065] E0—Theoretical efficacy of herbicide 1 at dosage P + theoretical efficacy of herbicide 2 at dosage Q + theoretical efficacy of herbicide 3 at dosage R;

[0066] E—The actual control efficacy of herbicides 1, 2 and 3 when mixed in different proportions.

[0067] E-E0 > 10% indicates a synergistic effect; E-E0 < -10% indicates an antagonistic effect; and E-E0 values ​​between the theoretical value and ±10% indicate an additive effect.

[0068] The experimental results show that:

[0069] 1) Within the ratio range of (70–110):(3–4):(10–30), no antagonistic effect was observed between metolachlor, propyzoxystrobin, and nicosulfuron, showing additive or synergistic effects. Among the eight different mixtures of the three, the E-E0 value of the combined effect of metolachlor, propyzoxystrobin, and nicosulfuron against barnyardgrass, amaranth, and velvetleaf was greater than 10 when the ratio was (70–110):(3–4):10, indicating the most significant additive or synergistic effect. This can be considered the optimal ratio range for mixing the three herbicides against the three weeds. Given that the dosage of nicosulfuron is higher than 120 g ai / hm, 2 For the safety of sorghum, a ratio of 110:4:10 is preferred.

[0070] 2) Within the ratio range of (80–120):(3–4):(10–30), no antagonistic effect was observed between butachlor, propyzoxystrobin, and mesotrione; they exhibited additive or synergistic effects. Among the eight different ratios of the three, the combination of butachlor, propyzoxystrobin, and mesotrione at (80–120):(3–4):10 resulted in an E-E0 value greater than 10 for barnyard grass, amaranth, and velvetleaf, indicating the most significant additive or synergistic effect. This can be considered the optimal ratio range for mixing the three with barnyard grass. Given that the dosage of mesotrione is higher than 120 g ai / hm, 2 For the safety of sorghum, a ratio of 120:4:10 is preferred. Specific screening test data are shown in Tables 2, 3, and 4.

[0071] Table 2 Combined effects of metolachlor / butachlor, propyzoxystrobin, and nicosulfuron-methyl mixtures on barnyardgrass.

[0072] Table 3. Combined effects of metolachlor / butachlor, propyzoxystrobin, and nicosulfuron-methyl mixed formulations on amaranth.

[0073]

[0074]

[0075] Table 4. Combined effects of metolachlor / butachlor, propyzoxystrobin, and nicosulfuron-methyl mixtures on velvetleaf.

[0076]

[0077]

[0078] (III) Drug Product Development

[0079] Based on the above formulation experiments, this invention screened wettable powders, suspension emulsions, water-dispersible granules, and dispersible oil suspensions using suspension rate and thermal storage stability as indicators. The screening results showed that suspension emulsions were the most ideal. The suspension rate and stability test results are shown in Table 5 for dosage form screening. Thermal storage stability was determined according to national standards.

[0080] Table 5. Test results for activity and thermal storage stability.

[0081]

[0082] The proportion of adjuvants in the SE (Self-Enhancing Agent) formulation of 40.2% butachlor, propyzoxystrobin, and mesotrione compound preparation was further optimized and determined to be as follows:

[0083] Based on 100 parts by weight, it includes: 36 parts butachlor, 1.2 parts propyzamide, 3 parts mesotrione, 15-18 parts emulsifier (agricultural emulsion 600, 602), 0.5-2.0 parts dispersant and spreading agent (OP-10, NP-10, NNO), 0.5-2.5 parts suspending agent (xanthan gum, soluble starch), and the remainder is made up with water.

[0084] Further optimization yielded 36 parts butachlor, 1.2 parts propyzamide, 3 parts mesotrione, 15 parts emulsifier (agricultural emulsion 600), 2.0 parts dispersant (NNO), 0.8 parts suspending agent (0.3 parts xanthan gum + 0.5 parts soluble starch), with the remainder to be made up with water.

[0085] The adjuvant ratio of the 37.2% metolachlor, propyzamide, and mesotrione compound formulation was further optimized and determined to be as follows:

[0086] Based on 100 parts by weight, it includes: 33 parts isopropyl chlorpyrifos, 1.2 parts propyzoxystrobin, 3 parts mesotrione, 15-18 parts emulsifier (agricultural emulsion 600, 602), 0.5-2.0 parts dispersant (OP-10, NP-10, NNO), 0.5-2.5 parts suspending agent (xanthan gum), with the remainder made up with water.

[0087] Further optimization yielded the following ingredients: 33 parts isopropylmetribazine, 1.2 parts propyzoxystrobin, 3 parts mesotrione, 15 parts emulsifier (agricultural emulsion 600), 2.0 parts dispersant (OP-10), 0.8 parts suspending agent (0.2 parts xanthan gum, 0.6 parts soluble starch), with the remainder to be made up with water.

[0088] Suspension emulsion processing flow: First, add the measured amount of nicosulfuron-methyl and propyzamide with an appropriate amount of water to a sand mill for sand milling. After the raw material powder particles are smaller than 45μm, open the discharge valve and enter the shear mixer. Add some adjuvants and stir. On the other hand, put butachlor or metolachlor and the corresponding adjuvants into another shear mixer for thorough shearing and stirring. After the properties are stable, put the two into the same shear mixer, and at the same time add other adjuvants (emulsifiers, dispersants, spreading agents, suspending agents, developing agents, etc.). Perform high-speed shearing. After the physicochemical properties are stable, enter the mixing tank, stir evenly, open the bottom valve of the mixing tank, add the suspension emulsion to the filter for filtration, transfer the filtered suspension emulsion to the suspension storage tank, let it stand, and after natural defoaming, take a sample for testing. After passing the test, send it to the suspension packaging machine for packaging.

[0089] (iv) Field safety trials and field efficacy trials against weeds

[0090] 1. Safety test

[0091] Field safety verification tests were conducted on the 40.2% butachlor·propyzoxystrobin·mesulfuron SE formulation developed above. The results showed that the 40.2% butachlor·propyzoxystrobin·mesulfuron SE formulation was safe at a dosage ≤1507.5 g ai / hm. 2 At this time, it has high safety for sorghum seedling emergence and growth, when the dosage is ≥1628.1g ai / hm. 2 At that time, it affected sorghum emergence and growth; the experimental dosage ranged from 1266.3 to 2532.6 g ai / hm. 2 Within the specified range, no impact was observed on corn seedling emergence; the safety for corn was good.

[0092] The safety profile of 37.2% metolachlor·propyzoxystrobin·nicosulfuron SE in sorghum and corn is similar to that of 40.2% butachlor·propyzoxystrobin·nicosulfuron SE, when the dosage is >1618.2 g ai / hm. 2 At that time, it affected sorghum emergence and growth; the experimental dosage ranged from 1171.8 to 1618.2 g ai / hm. 2 Within the range (including 1618.2 g ai / hm) 2 It showed high safety for sorghum growth, and no effect on corn emergence was observed within the tested dosage range; it also showed relatively high safety for corn. Specific data are shown in Table 6.

[0093] Table 6 Safety of the two compound agents on sorghum and corn

[0094]

[0095] In field efficacy verification trials, different doses of 40.2% butachlor·propycinol·mesulfuron SE showed good control efficacy against annual weeds, with doses ranging from 1266.3 to 1386.9 g ai / hm. 2 Within the specified range, 40 days after application, the plant control efficacy against annual weeds in sorghum fields ranged from 87.2% to 92.2%, and the fresh weight control efficacy ranged from 92.2% to 95.6%. The application rate of 40.2% butachlor·propycinol·mesulfuron SE was 1266.3 g ai / hm². 2 At the same time, compared with the control agent 50% metolachlor·atrazine SE (1500g ai / hm) 2 Compared to the previous method, the control efficacy was slightly higher, but the application rate was reduced by 15.58%. Furthermore, the application rate was between 1266.3 and 1386.9 g a.i. / hm². 2 Within this range, sorghum is relatively safe.

[0096] Note: Other weeds include: water thorn, reverse branch amaranth, pigweed, etc.

[0097] 40.2% butachlor·propyzoxystrobin·nicosulfuron SE at different dosages showed good control efficacy against annual weeds, with dosages ranging from 1025.1 to 1386.9 g ai / hm. 2 Within the specified range, 40 days after application, the plant control efficacy against annual weeds in sorghum fields ranged from 73.0% to 92.2%, and the fresh weight control efficacy ranged from 79.4% to 95.6%. The application rate of 40.2% butachlor·propycinol·mesulfuron SE was 1206.0 g ai / hm². 2 At the same time, compared with the control agent 50% metolachlor·atrazine SE (1500 g a.i. / hm) 2 Compared to other methods, the control efficacy was slightly higher, but the application rate was reduced by 19.6%. Furthermore, the application rate was between 1025.1 and 1386.9 g ai / hm. 2 Within this range, no adverse effects were observed on sorghum emergence and growth, indicating high safety, and this range can be used as the application dosage range for sorghum fields.

[0098] 37.2% metolachlor·propyzoxystrobin·nicosulfuron SE at different dosages showed good control efficacy against annual weeds, with dosages ranging from 1004.4 to 1339.2 g ai / hm. 2 Within the specified range, 40 days after application, the plant control efficacy against annual weeds in sorghum fields ranged from 72.3% to 97.2%, and the fresh weight control efficacy ranged from 78.3% to 96.7%. At the same efficacy, compared with the control herbicide 50% metolachlor·atrazine SE, the application rate was reduced. Visual observation after application indicated high safety for sorghum within this range, which can be considered the appropriate dosage range for this herbicide in sorghum fields.

[0099] Table 7. Weed control efficacy of butachlor / metolachlor·propyzoxystrobin·nicosulfuron SE against sorghum fields (40 days after application).

[0100] Note: Other weeds include: water thorn, reverse branch amaranth, pigweed, etc.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A compound herbicide containing propyzoxystrobin and mesotrione, characterized in that, The compound herbicide includes the following (a) to (c): (a) Metolachlor or butachlor; (b) nicosulfuron; (c) Propylene fluroxypyr.

2. The compound herbicide according to claim 1, characterized in that, (a) is metolachlor; Preferably, the compound herbicide comprises isopropyl alachlor, propyzoxystrobin, and mesotrione in a mass ratio of 70–110:3–4:10–30, and more preferably in a mass ratio of 110:4:

10.

3. The compound herbicide according to claim 2, characterized in that, The application rate of the compound herbicide is 1004.4–1339.2 g ai / hm. 2 .

4. The compound herbicide according to claim 2 or 3, characterized in that, The formulation of the compound herbicide includes suspension emulsions; Preferably, the suspension emulsion comprises, by weight, 33 parts of isopropylmetribazine, 1.2 parts of propyzoxystrobin, 3 parts of mesotrione, 15-18 parts of emulsifier, 0.5-2 parts of dispersant, 0.5-2.5 parts of suspending agent, and the balance being water.

5. The compound herbicide according to claim 1, characterized in that, (a) is butachlor; Preferably, the compound herbicide comprises butachlor, propyzamide, and mesotrione in a mass ratio of 80–120:3–4:10–30; more preferably, the mass ratio is 120:4:

10.

6. The compound herbicide according to claim 5, characterized in that, The application rate of the compound herbicide is 1025.1–1386.9 g ai / hm. 2 .

7. The compound herbicide according to claim 5 or 6, characterized in that, The formulation of the compound herbicide includes suspension emulsions; Preferably, the suspension emulsion comprises, by weight, 36 parts butachlor, 1.2 parts propyzamide, 3 parts mesotrione, 15-18 parts emulsifier, 0.5-2 parts dispersant, 0.5-2.5 parts suspending agent, and the balance being water.

8. The application of the compound herbicide according to any one of claims 1-7 in sorghum and corn fields; Preferably, the application period for corn and sorghum crops is before seedling emergence.

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