Herbicidal composition containing pyraflufen and preparation method thereof

Abstract

The invention relates to the technical field of weeding compositions and herbicides, and particularly discloses a weeding composition containing pyraflufen and a preparation method of the weeding composition. According to the weeding composition containing the pyraflufen-ethyl, the effective active ingredients are the imazamox and the pyraflufen-ethyl, and the mass ratio of the imazamox to the pyraflufen-ethyl is (1-60): (1-60). When the imazamox and the pyraflufen in the prepared weeding composition containing the pyraflufen are mixed for use, the synergistic effect is achieved, the weeding effect is enhanced, broadleaf weeds and grassy weeds can be controlled at the same time through mixed use, and the more comprehensive weeding effect is provided.

Description

Technical Field

[0001] The present application relates to the technical field of herbicidal composition herbicides, and more specifically, to a herbicidal composition containing metazachlor and a preparation method thereof. Background Art

[0002] Metazachlor, whose chemical name is N-(1-ethylpropyl)-2,6-dinitro-3,4-dimethylaniline, is a selective herbicide belonging to the aniline herbicide class. It achieves the weed control effect mainly by inhibiting the growth of weed seedlings and preventing cell division in their roots and hypocotyls. It is usually used to control a variety of annual grass weeds and is widely used in field management of crops such as corn, soybeans, cotton, wheat, barley, oats, beets, sunflowers, tobacco, potatoes, and vegetables.

[0003] With the development of agricultural science and technology, metazachlor has been widely used in agricultural production, with good control effect, which can effectively protect crops from weed competition and improve crop yield and quality. However, when metazachlor is used alone, its weed control effect is limited and it is easy to develop drug resistance. Summary of the invention

[0004] In order to improve the problem that the herbicidal effect of metazachlor is limited to a certain extent when used alone, the present application provides a herbicidal composition containing metazachlor and a preparation method thereof.

[0005] In a first aspect, the present application provides a herbicidal composition containing metazachlor, adopting the following technical scheme: a herbicidal composition containing metazachlor, wherein the effective active ingredients are imazamox and metazachlor, and the mass ratio of imazamox to metazachlor is 1-60:1-60.

[0006] By adopting the above technical scheme, in the herbicidal composition, the mechanism of action of imazamox is to inhibit photosystem II in photosynthesis and prevent weed growth; the mechanism of action of metazachlor is to inhibit the cell division and growth of weed seedlings and prevent the development of weed roots and shoots, thereby achieving a weed control effect. When imazamox and metazachlor are used in combination, they play a synergistic role and enhance the weed control effect. The combination can control broadleaf weeds and grass weeds at the same time, providing a more comprehensive weed control effect.

[0007] The mass ratio of imazamox and metazachlor is further limited. Imazamox mainly targets annual broadleaf weeds and grass weeds by inhibiting photosystem II in photosynthesis to prevent weed growth; while metazachlor mainly controls annual grass weeds by inhibiting cell division and growth of weed seedlings to prevent the development of roots and shoots. Limiting the mass ratio helps avoid the long-term use of the same herbicide alone, thereby reducing the risk of weeds developing resistance to specific herbicides.

[0008] In a second aspect, the present application also provides a use of the above-mentioned herbicidal composition in the preparation of a herbicide for post-emergence weed control in soybean fields.

[0009] By adopting the above technical scheme, common weeds in soybean fields include broadleaf weeds and grass weeds. The herbicide composition can control these two types of weeds at the same time by containing herbicides with different mechanisms of action, thereby providing a wider weed control spectrum; by using a composition containing multiple herbicides, the risk of weeds developing resistance to a single herbicide can be reduced, thereby extending the service life of the herbicide.

[0010] Optionally, the herbicidal composition comprises the following raw materials: 50-60 parts of effective active ingredients, 6-10 parts of sodium lignin sulfonate, 8-12 parts of modified saponin powder, 30-35 parts of modified attapulgite, and 3-6 parts of polyoxyethylene monopalmitate.

[0011] By adopting the above technical scheme, in the herbicidal composition, the effective active ingredients can remove weeds, reduce the risk of weeds developing resistance to a single herbicide, and extend the service life of the herbicide. Sodium lignin sulfonate can reduce the surface tension of water, improve the dispersibility of the herbicidal composition in water, so that the herbicidal composition can be evenly dispersed to form a stable suspension, prevent the effective active ingredients from precipitating, and ensure the uniformity of the liquid during spraying. The modified saponin powder contains active ingredients such as saponins, which can improve the wettability and dispersibility of the effective active ingredients, making the effective active ingredients easier to disperse in water to form a uniform suspension, thereby improving the efficacy of the herbicidal composition; the saponins in the modified saponin powder have surface activity, which can reduce the surface tension of water, help the effective active ingredients to better adhere to the surface of the crop, and improve the efficacy.

[0012] Modified attapulgite has good adsorption and porous structure, and can be used as a carrier of effective active ingredients to evenly carry and fix the active ingredients of the herbicide composition, ensuring the stability and uniform distribution of the active ingredients during spraying; and the special structure of modified attapulgite helps to slow-release the effective active ingredients, prolong the retention time of the herbicide composition on the crop surface, and improve the durability of the efficacy. Polyoxyethylene monopalmitate can emulsify the oily components in the effective active ingredients to form a stable emulsion in water, thereby improving the dispersibility and uniformity of the effective active ingredients. In the herbicide composition, the various components cooperate with each other, and the prepared herbicide composition can adhere to the plant leaves and prolong the efficacy time.

[0013] Optionally, the preparation method of the modified sapodilla powder comprises the following steps: (1) cleaning the sapodilla, grinding, sieving, dispersing in an acetic acid solution, stirring for 5-10 min, washing with water, dispersing in an aqueous solution of sodium dodecylbenzene sulfonate, stirring evenly, filtering, and drying to obtain pretreated sapodilla; (2) Dispersing the modified fly ash in deionized water, stirring for 15-20 minutes, adding the sapodilla pretreated in step (1), stirring at a temperature of 80-85° C. for 1-2 hours, drying, grinding, and sieving to obtain modified sapodilla powder.

[0014] By adopting the above technical solution, the acidity of acetic acid can interact with the saponin components in the soapberry powder, enhance its surface activity, reduce the surface tension of water, make the soapberry powder dispersed more evenly in the water, prevent it from agglomerating or precipitating in the water, maintain its suspended state, and facilitate subsequent mixing with other components. The combination of sodium dodecylbenzene sulfonate and the saponin components in the soapberry powder can significantly enhance the surface activity of the mixture, reduce the surface tension of water, make water more easily wet the solid surface, and help the herbicidal composition better adhere to the crop surface and exert its efficacy.

[0015] The modified fly ash is rich in minerals such as silicon, aluminum, and calcium, has a certain adsorption capacity, can be loaded on the surface and pores of the pre-treated sapodilla particles, increase the biological activity of sapodilla, and improve the control effect of the herbicidal composition on pests and pathogens. In addition, the adsorption of sapodilla particles is increased, so that the modified sapodilla powder is adsorbed and adhered to the surface of crops, the drug effect persistence of effective active ingredients is increased, and the use efficiency of the herbicidal composition is improved. In addition, the adsorption of fly ash can delay the release of the herbicidal composition, prolong the drug effect time of the herbicidal composition on the plant surface, reduce the number of applications of the herbicidal composition, and reduce the use cost of the herbicidal composition.

[0016] Optionally, the mass ratio of the saponins, sodium dodecylbenzene sulfonate and modified fly ash is 1:0.2-0.4:0.5-0.6.

[0017] By adopting the above technical scheme, the mass ratio of saponins, sodium dodecylbenzene sulfonate and fly ash is further limited within a certain range, thereby improving the biological activity, adhesion and wettability of the modified saponin powder. The combination of sodium dodecylbenzene sulfonate and saponin components in the saponin powder can significantly enhance the surface activity of the mixture, reduce the surface tension of water, make it easier for water to wet the solid surface, and help the herbicidal composition to better adhere to the crop surface. The modified fly ash can be loaded on the surface and pores of the pretreated saponin particles, thereby increasing the biological activity of the saponins, allowing the modified saponin powder to adhere to the crop surface, increasing the durability of the efficacy of the effective active ingredients, reducing the number of applications of the herbicidal composition, and reducing the use cost of the herbicidal composition.

[0018] Optionally, the preparation method of the modified fly ash comprises the following steps: heating the fly ash at 300-320°C for 1-1.5h, washing with ethanol, dispersing it in deionized water, adding fatty alcohol polyoxyethylene ether and sodium silicate, stirring evenly, filtering and drying to obtain pretreated fly ash.

[0019] By adopting the above technical scheme, the fly ash is heated at a temperature of 300-320°C, which promotes the further combustion of unburned carbonaceous components in the fly ash, reduces the carbon content in the fly ash, improves the activity of the fly ash, makes its particles denser, reduces the porosity, and improves the filling and compactness of the fly ash.

[0020] Fatty alcohol polyoxyethylene ether has good wetting, dispersing and emulsifying properties. As a nonionic surfactant, fatty alcohol polyoxyethylene ether can significantly reduce the surface tension of water, improve the wettability of the herbicidal composition on the plant surface, and make the herbicidal composition more evenly attached to the plant leaves. Fly ash has a certain adsorption capacity and can adsorb the effective ingredients of the herbicidal composition. As a carrier of the herbicidal composition, it improves the adhesion and persistence of the herbicidal composition. When fatty alcohol polyoxyethylene ether is mixed with fly ash, the wetting and dispersing effects of fatty alcohol polyoxyethylene ether are combined with the adsorption and carrier effects of fly ash, which can improve the adhesion and permeability of the herbicidal composition, so that the herbicidal composition can be more effectively absorbed and utilized by plants.

[0021] Sodium silicate has certain gelling properties, wettability and adhesion, and can be used as a stabilizer in the herbicidal composition to help the effective active ingredients remain stable during storage and transportation, and improve the wettability and adhesion of the effective active ingredients on the crop surface. Sodium silicate can be loaded on the surface and pores of fly ash, and combined with fly ash and fatty alcohol polyoxyethylene ether, it can improve the adhesion of the herbicidal composition on the crop surface, improve the stability of the herbicidal composition, and prolong the efficacy of the herbicidal composition.

[0022] Optionally, the method for preparing the modified attapulgite comprises the following steps: (1) dispersing attapulgite in a hydrochloric acid solution, stirring at 60-65° C. for 1-2 hours, washing with water, then calcining at 700-750° C. for 4-5 hours, and cooling to obtain pretreated attapulgite; (2) dispersing the modified starch in deionized water, heating at 75-80° C. for 10-15 min, filtering, and drying to obtain treated starch; (3) Dispersing the pretreated attapulgite in step (1) in deionized water, adding the starch and lignin treated in step (2), stirring at a temperature of 86-90° C. for 1-2 h, filtering, and drying to obtain modified attapulgite.

[0023] By adopting the above technical scheme, hydrochloric acid activates the surface of the attapulgite, changes the interlayer structure of the attapulgite, makes it have a higher specific surface area and porosity, and improves its adsorption performance; then it is calcined at 700-750°C to remove moisture from the attapulgite, form a more stable crystal structure, and further improve the adsorption performance of the attapulgite.

[0024] When the modified starch is heated, the starch granules absorb water, expand in volume, and eventually form a transparent colloidal solution. The hydrogen bonds between the starch molecules are broken, the starch granules rupture, and more starch molecules are released, thereby increasing the solubility and viscosity of the starch.

[0025] Pretreated attapulgite, treated starch and lignin are mixed, and lignin can be loaded on the surface and pores of the attapulgite. The starch has a certain viscosity, so that the lignin adheres to the surface of the attapulgite, thereby increasing the dispersibility and stability of the attapulgite. The composite material of attapulgite and starch has a large specific surface area and porosity, which can increase the adhesion of the herbicide composition on the crop surface. The biological activity and surface activity of lignin help the components of the herbicide composition to better penetrate into plant tissues, thereby improving the biological activity and efficacy of the herbicide composition.

[0026] Optionally, the mass ratio of the attapulgite, modified starch and lignin is 1:0.6-0.8:0.2-0.3.

[0027] By adopting the above technical scheme, the mass ratio of attapulgite, modified starch and lignin is further limited within a certain range, the dispersibility, adsorption and stability of attapulgite are improved, and lignin can be used as a synergist of the herbicidal composition to improve the biological activity and efficacy of the herbicidal composition, and can promote the attachment and penetration of the herbicidal composition on the surface of the plant, thereby improving the utilization rate and effect of the herbicidal composition. Lignin can be loaded on the surface and pores of attapulgite, starch has a certain viscosity, so that lignin adheres to the surface of attapulgite, increasing the dispersibility and stability of attapulgite, and the composite material of attapulgite and starch has a large specific surface area and porosity, increasing the adhesion of the herbicidal composition on the surface of the crop, and lignin helps the components of the herbicidal composition to better penetrate into the plant tissue, thereby improving the biological activity and efficacy of the herbicidal composition.

[0028] Optionally, the preparation method of the modified starch comprises the following steps: dispersing starch in deionized water, adding a silane coupling agent, stirring at a temperature of 80-85° C. for 1-2 hours, then adding hydroxyethyl methyl cellulose, stirring evenly, drying, and grinding to obtain the modified starch.

[0029] By adopting the above technical scheme, the silane coupling agent can improve the interfacial bonding force between the herbicide composition and the crop surface, improve the adhesion and permeability of the herbicide composition, enable the components of the herbicide composition to penetrate into plant tissues more effectively, and improve biological activity and efficacy. The silane coupling agent, as an interfacial modifier, can improve the interfacial bonding force of starch and improve the surface properties of starch. Hydroxyethyl methylcellulose has good dispersibility and thickening properties. When mixed with starch and silane coupling agent, the interaction between the systems is enhanced, and the overall viscosity is improved, so that the modified starch has better viscosity, which helps to improve the viscosity of attapulgite, so that the attapulgite adheres to the crop surface and improves the durability of the efficacy of the herbicide composition.

[0030] In a third aspect, the present application provides a method for preparing a herbicidal composition containing metazachlor, comprising the following steps: mixing the effective active ingredient, sodium lignin sulfonate, modified saponin powder, modified attapulgite and polyoxyethylene monopalmitate evenly, and crushing them to obtain the herbicidal composition.

[0031] By adopting the above technical solution, the method is simple to operate, and the composition can be stirred evenly, which helps the herbicidal composition to exert its efficacy more stably.

[0032] In summary, this application has the following beneficial effects: 1. The mechanism of action of imazamox in this application is to inhibit photosystem II in photosynthesis and prevent weed growth; the mechanism of action of metazachlor is to inhibit the cell division and growth of weed seedlings and prevent the development of weed roots and shoots, thereby achieving a weed control effect. When imazamox and metazachlor are used in combination, they play a synergistic role and enhance the weed control effect. The mixed use can control broadleaf weeds and grass weeds at the same time, providing a more comprehensive weed control effect.

[0033] 2. The modified saponin powder in the present application contains active ingredients such as saponins, which can improve the wettability and dispersibility of the effective active ingredients, making the effective active ingredients easier to disperse in water to form a uniform suspension, thereby improving the efficacy of the herbicidal composition; the saponins in the modified saponin powder have surface activity, which can reduce the surface tension of water, help the effective active ingredients better adhere to the crop surface, and improve the efficacy.

[0034] 3. The modified attapulgite in the present application has good adsorption and porous structure, and can be used as a carrier of effective active ingredients to evenly carry and fix the active ingredients of the herbicide composition, ensuring the stability and uniform distribution of the active ingredients during spraying; and the special structure of the modified attapulgite helps to slow-release the effective active ingredients, prolong the retention time of the herbicide composition on the crop surface, and improve the durability of the efficacy. DETAILED DESCRIPTION

[0035] Preparation example of modified saponin powder Preparation Example 1-1 The preparation method of modified saponin powder comprises the following steps: (1) 1.2 kg of sapodilla was cleaned, ground, passed through a 60-mesh sieve, and then dispersed in 2 L of 12% acetic acid solution, stirred for 10 min, washed with water, and then dispersed in a 0.3% sodium dodecylbenzene sulfonate aqueous solution, stirred evenly, filtered, and dried to obtain pretreated sapodilla; (2) Disperse the modified fly ash in 3 L of deionized water, stir for 18 min, add the sapodilla pretreated in step (1), stir for 2 h at 85 °C, dry, grind, and pass through an 80-mesh sieve to obtain modified sapodilla powder.

[0036] The mass ratio of saponins, sodium dodecylbenzene sulfonate and modified fly ash is 1:0.2:0.6.

[0037] The preparation method of modified fly ash comprises the following steps: heating 1 kg of fly ash at 320° C. for 1.5 h, washing with ethanol, dispersing in 1.5 L of deionized water, adding 0.3 kg of fatty alcohol polyoxyethylene ether and 0.5 kg of sodium silicate, stirring evenly, filtering and drying to obtain pretreated fly ash.

[0038] Preparation Example 1-2 The difference from Preparation Example 1-1 is that in step (1), sodium dodecylbenzenesulfonate is not added.

[0039] Preparation Example 1-3 The difference from Preparation Example 1-1 is that in step (2), no modified fly ash is added.

[0040] Preparation Example 1-4 The difference from Preparation Example 1-1 is that the mass ratio of saponins, sodium dodecylbenzene sulfonate and modified fly ash is 1:0.4:0.5.

[0041] Preparation Example 1-5 The difference from Preparation Example 1-1 is that the mass ratio of saponins, sodium dodecylbenzene sulfonate and modified fly ash is 1:0.1:0.8.

[0042] Preparation Example 1-6 The difference from Preparation Example 1-1 is that fatty alcohol polyoxyethylene ether is not added in the preparation method of modified fly ash.

[0043] Preparation Example 1-7 The difference from Preparation Example 1-1 is that sodium silicate is not added in the preparation method of modified fly ash.

[0044] Preparation example of modified attapulgite Preparation Example 2-1 The preparation method of modified attapulgite comprises the following steps: (1) dispersing 1.5 kg of attapulgite in 2.1 L of 8% hydrochloric acid solution, stirring at 65° C. for 2 h, washing with water, and then calcining at 750° C. for 5 h, cooling, and obtaining pretreated attapulgite; (2) dispersing the modified starch in 1.2 L of deionized water, heating at 80° C. for 15 min, filtering, and drying to obtain treated starch; (3) Disperse the pretreated attapulgite in step (1) in 3.5 L of deionized water, add the starch and lignin treated in step (2), stir at 90° C. for 2 h, filter, and dry to obtain modified attapulgite.

[0045] The mass ratio of attapulgite, modified starch and lignin is 1:0.6:0.3.

[0046] The preparation method of modified starch comprises the following steps: dispersing 1 kg of starch in 1.5 L of deionized water, adding silane coupling agent GH570, stirring at a temperature of 85° C. for 2 hours, adding 0.2 kg of hydroxyethyl methylcellulose, stirring evenly, drying, and grinding to obtain modified starch.

[0047] Preparation Example 2-2 The difference from Preparation Example 2-1 is that in step (2), no modified starch is added.

[0048] Preparation Example 2-3 The difference from Preparation Example 2-1 is that in step (3), no lignin is added.

[0049] Preparation Example 2-4 The difference from Preparation Example 2-1 is that the mass ratio of attapulgite, modified starch and lignin is 1:0.8:0.2.

[0050] Preparation Example 2-5 The difference from Preparation Example 2-1 is that the mass ratio of attapulgite, modified starch and lignin is 1:0.1:0.6.

[0051] Preparation Example 2-6 The difference from Preparation Example 2-1 is that in the preparation method of the modified starch, no silane coupling agent GH570 is added.

[0052] Preparation Example 2-7 The difference from Preparation Example 2-1 is that hydroxyethyl methyl cellulose is not added in the preparation method of the modified starch. Example

[0053] Example 1 A herbicidal composition containing metazachlor, wherein the effective active ingredients are imazamox and metazachlor, and the mass ratio of imazamox to metazachlor is 1:1.

[0054] The herbicidal composition comprises the following raw materials: 50 kg of effective active ingredients, 10 kg of sodium lignin sulfonate, 12 kg of modified saponin powder, 35 kg of modified attapulgite, and 3 kg of polyoxyethylene monopalmitate.

[0055] The preparation method of a herbicidal composition containing metazachlor comprises the following steps: mixing effective active ingredients, sodium lignin sulfonate, modified saponin powder, modified attapulgite and polyoxyethylene monopalmitate uniformly, and crushing them to obtain the herbicidal composition.

[0056] The modified saponin powder was prepared according to Preparation Example 1-1, and the modified attapulgite was prepared according to Preparation Example 2-1.

[0057] Example 2 A herbicidal composition containing metazachlor, which is different from Example 1 in that the mass ratio of imazapic-pirox to metazachlor is 1:60.

[0058] The herbicidal composition comprises the following raw materials: 60 kg of effective active ingredients, 6 kg of sodium lignin sulfonate, 8 kg of modified saponin powder, 30 kg of modified attapulgite, and 6 kg of polyoxyethylene monopalmitate.

[0059] Example 3 A herbicidal composition containing metazachlor, which is different from Example 1 in that the mass ratio of methoxam to metazachlor is 60:1.

[0060] Example 4 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified saponin powder adopts the preparation example 1-2.

[0061] Example 5 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified saponin powder adopts the preparation example 1-3.

[0062] Example 6 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified saponin powder adopts the preparation examples 1-4.

[0063] Example 7 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified saponin powder adopts the preparation example 1-5.

[0064] Example 8 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified saponin powder adopts the preparation example 1-6.

[0065] Example 9 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified saponin powder adopts the preparation example 1-7.

[0066] Example 10 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified attapulgite adopts the preparation example 2-2.

[0067] Embodiment 11 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified attapulgite adopts the preparation example 2-3.

[0068] Example 12 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified attapulgite is prepared according to Preparation Example 2-4.

[0069] Embodiment 13 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified attapulgite is prepared according to Preparation Example 2-5.

[0070] Embodiment 14 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified attapulgite is prepared according to Preparation Example 2-6.

[0071] Embodiment 15 A herbicidal composition containing metazachlor, which is different from Example 1 in that the modified attapulgite is prepared in Preparation Example 2-7.

[0072] Comparative Example Comparative Example 1 A herbicidal composition containing metazachlor, which differs from Example 1 in that modified saponin powder is not added.

[0073] Comparative Example 2 A herbicidal composition containing metazachlor, which is different from Example 1 in that an equal amount of sapodilla powder is used to replace the modified sapodilla powder.

[0074] Comparative Example 3 A herbicidal composition containing metazachlor, which differs from Example 1 in that modified attapulgite is not added.

[0075] Comparative Example 4 A herbicidal composition containing metazachlor, which is different from Example 1 in that an equal amount of attapulgite is used to replace the modified attapulgite.

[0076] Performance testing The herbicidal compositions containing metazachlor prepared in Examples 1-15 and Comparative Examples 1-4 were tested for their medicinal properties.

[0077] Field efficacy test A soybean field was selected as the test site. Glechoma longituba, Purslane, Setaria viridis, and Echinochloa crus-galli were basically evenly distributed as the test objects. The number of weeds in each treatment was counted 30 days and 45 days after application, and the control effect was calculated. Control effect (%) = (number of weeds before application - number of weeds after application) / number of weeds before application × 100 Comparison of drugs: 4% methoxazole aqueous solution (commercially available), 500g / L metazachlor aqueous suspension (commercially available).

[0078] Test method: The test area was divided into 20 plots, and the herbicidal compositions of Examples 1-15 and Comparative Examples 1-4 were used in the plots. Each test plot had an area of ​​30 square meters and was arranged in random blocks. 36 kg of water was added per mu, 10 g of the agent was used per mu, and the test area was evenly sprayed with a backpack sprayer. After the test, the death of weeds was observed 30 days and 45 days after the spraying. The test results are shown in Table 1.

[0079] Table 1 Test data of embodiments and comparative examples Combining the examples and the data in Table 1, it can be seen that the herbicidal compositions containing metazachlor prepared in Examples 1-3 have good weed control effects, among which the control effects of cleavers in Example 1 30 days and 45 days after the application are 99.5% and 97.4% respectively, the control effects of purslane 30 days and 45 days after the application are 99.8% and 97.7% respectively, the control effects of Setaria viridis 30 days and 45 days after the application are 99.7% and 97.5% respectively, and the control effects of barnyard grass 30 days and 45 days after the application are 99.9% and 97.8% respectively, indicating that the herbicidal compositions prepared in the present application cooperate with each other, and the prepared herbicidal compositions can adhere to the plant leaves, improve the efficacy, and prolong the efficacy time.

[0080] In Example 4, sodium dodecylbenzene sulfonate is not added to the modified sapodilla powder of the herbicidal composition, and in Example 5, modified fly ash is not added to the modified sapodilla powder of the herbicidal composition. In Examples 6-7, the mass ratio of sapodilla, sodium dodecylbenzene sulfonate and modified fly ash is changed. The control effects of cholerae, purslane, foxtail grass and barnyard grass 30 days after application and 45 days after application of the herbicidal composition in Examples 4-5 are lower than those in Examples 1-3, while the control effects of cholerae, purslane, foxtail grass and barnyard grass 30 days after application and 45 days after application of the herbicidal composition in Example 7 are lower than those in Examples 1-2, but higher than those in Examples 4-5, indicating that sodium dodecylbenzene sulfonate combines with the saponin components in the sapodilla powder to enhance the surface activity of the mixture, making it easier for water to wet the solid surface, which helps the herbicidal composition to better adhere to the crop surface, and the modified fly ash can be loaded on the surface and pores of the pretreated sapodilla particles, so that the modified sapodilla powder adheres to the crop surface and increases the durability of the efficacy of the effective active ingredients.

[0081] Fatty alcohol polyoxyethylene ether is not added to the fly ash modified by the herbicidal composition in Example 8, and sodium silicate is not added to the fly ash modified by the herbicidal composition in Example 9. The protective effects of Glechoma longituba, Portulaca oleracea, Setaria viridis, and Echinochloa crus-galli 30 days after application and 45 days after application of Examples 8-9 are lower than those of Examples 1-3, but higher than those of Example 5, indicating that fatty alcohol polyoxyethylene ether significantly reduces the surface tension of water, improves the wettability of the herbicidal composition on the plant surface, and makes the herbicidal composition more evenly attached to the plant leaves; sodium silicate can be loaded on the surface and pores of fly ash, and combined with fly ash and fatty alcohol polyoxyethylene ether, improves the adhesion of the herbicidal composition on the crop surface, improves the stability of the herbicidal composition, and prolongs the efficacy of the herbicidal composition.

[0082] In Example 10, no modified starch is added to the modified attapulgite of the herbicidal composition, and in Example 11, no lignin is added to the modified attapulgite of the herbicidal composition. In Examples 12-13, the mass ratio of attapulgite, modified starch and lignin is changed. The protective effects of cleaver, purslane, foxtail grass and barnyard grass 30 days after application and 45 days after application of the herbicidal composition in Examples 10-11 are lower than those in Examples 1-3, while the protective effects of cleaver, purslane, foxtail grass and barnyard grass 30 days after application and 45 days after application of the herbicidal composition in Example 13 are lower than those in Examples 1-3, but higher than those in Examples 10-11, indicating that lignin can be loaded on the surface and pores of attapulgite, starch has a certain viscosity, so that lignin adheres to the surface of attapulgite, thereby increasing the adhesion of the herbicidal composition on the crop surface, and lignin helps the components of the herbicidal composition to better penetrate into plant tissues, thereby improving the biological activity and efficacy of the herbicidal composition.

[0083] No silane coupling agent GH570 is added to the modified starch of the herbicidal composition in Example 14, and no hydroxyethyl methylcellulose is added to the modified starch of the herbicidal composition in Example 15. The protective effects of Glechoma longituba, Purslane, Setaria viridis, and Echinochloa crus-galli of Examples 14-15 30 days after application and 45 days after application are lower than those of Examples 1-3, but higher than those of Example 11, indicating that the silane coupling agent improves the interfacial bonding force of starch and improves the surface properties of starch. Hydroxyethyl methylcellulose has good dispersibility and thickening properties, and is mixed with starch and silane coupling agent to improve the overall viscosity, so that the modified starch has better viscosity, which helps to improve the viscosity of attapulgite, allows the attapulgite to adhere to the crop surface, and improves the durability of the herbicidal composition.

[0084] Comparative Examples 1 and 3 do not add modified saponin powder and modified attapulgite, respectively. As can be seen from Table 1, compared with Example 1, the protective effects of Gleditsia sinensis, Portulaca oleracea, Setaria viridis, and Echinochloa crus-galli 30 days after application and 45 days after application are lower than those of Examples 1-3, indicating that the saponins in the modified saponin powder have surface activity, which helps the effective active ingredients to better adhere to the crop surface and improve the efficacy; the modified attapulgite has good adsorption and porous structure, and can be used as a carrier of the effective active ingredients, prolonging the residence time of the herbicidal composition on the crop surface and improving the durability of the efficacy.

[0085] Comparative Example 2 and Comparative Example 4 are respectively replaced by modified saponin powder with an equal amount of saponin powder and modified attapulgite with an equal amount of attapulgite. As can be seen from Table 1, compared with Example 1, the protective effects of Gleditsia sinensis, Portulaca oleracea, Setaria viridis, and Echinochloa crus-galli 30 days after application and 45 days after application are significantly worse than those of Examples 1-3, but better than those of Comparative Example 1 and Comparative Example 3, indicating that the modified saponin powder and attapulgite in the present application have better protective effects, thereby prolonging the effective active ingredients to better adhere to the crop surface and improving the efficacy.

[0086] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A herbicidal composition containing metazachlor, characterized in that: The effective active ingredients are imazamox and metazachlor, and the mass ratio of the imazamox to metazachlor is 1-60:1-60.

2. Use of the herbicidal composition as claimed in claim 1 in weeding soybean seedlings.

3. A herbicidal composition containing metazachlor according to claim 1, characterized in that: The herbicidal composition comprises the following raw materials: 50-60 parts of effective active ingredients, 6-10 parts of sodium lignin sulfonate, 8-12 parts of modified saponin powder, 30-35 parts of modified attapulgite, and 3-6 parts of polyoxyethylene monopalmitate.

4. A herbicidal composition containing metazachlor according to claim 3, characterized in that: The preparation method of the modified saponin powder comprises the following steps: (1) Cleaning the sapodilla, grinding, sieving, and then dispersing in an acetic acid solution, stirring for 5-10 minutes, washing with water, and then dispersing in an aqueous solution of sodium dodecylbenzene sulfonate, stirring evenly, filtering, and drying to obtain pretreated sapodilla; (2) Dispersing the modified fly ash in deionized water, stirring for 15-20 minutes, adding the sapodilla pretreated in step (1), stirring at a temperature of 80-85° C. for 1-2 hours, drying, grinding, and sieving to obtain modified sapodilla powder.

5. A herbicidal composition containing metazachlor according to claim 4, characterized in that: The mass ratio of the saponins, sodium dodecylbenzene sulfonate and modified fly ash is 1:0.2-0.4:0.5-0.

6.

6. A herbicidal composition containing metazachlor according to claim 4, characterized in that: The preparation method of the modified fly ash comprises the following steps: heating the fly ash at 300-320°C for 1-1.5h, washing with ethanol, dispersing the fly ash in deionized water, adding fatty alcohol polyoxyethylene ether and sodium silicate, stirring evenly, filtering and drying to obtain pretreated fly ash.

7. A herbicidal composition containing metazachlor according to claim 3, characterized in that: The preparation method of the modified attapulgite comprises the following steps: (1) dispersing attapulgite in a hydrochloric acid solution, stirring at 60-65° C. for 1-2 hours, washing with water, and then roasting at 700-750° C. for 4-5 hours, cooling, and obtaining pretreated attapulgite; (2) dispersing the modified starch in deionized water, heating at 75-80° C. for 10-15 min, filtering, and drying to obtain treated starch; (3) Dispersing the pretreated attapulgite in step (1) in deionized water, adding the starch and lignin treated in step (2), stirring at a temperature of 86-90° C. for 1-2 h, filtering, and drying to obtain modified attapulgite.

8. A herbicidal composition containing metazachlor according to claim 7, characterized in that: The mass ratio of the attapulgite, modified starch and lignin is 1:0.6-0.8:0.2-0.

3.

9. The herbicidal composition containing metazachlor according to claim 7, characterized in that: The preparation method of the modified starch comprises the following steps: dispersing starch in deionized water, adding a silane coupling agent, stirring at a temperature of 80-85° C. for 1-2 hours, adding hydroxyethyl methyl cellulose, stirring evenly, drying, and grinding to obtain the modified starch.

10. The herbicidal composition containing metazachlor according to claim 3, characterized in that: The effective active ingredients, sodium lignin sulfonate, modified saponin powder, modified attapulgite and polyoxyethylene monopalmitate are uniformly mixed and crushed to obtain a herbicidal composition.

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