An emulsifiable floating granule of a rice machine transplanting field weeding composition and a preparation method thereof

Abstract

This invention discloses an emulsifiable floating granule formulation for weed control in mechanized rice transplanting fields and its preparation method. The weed control composition comprises the following components by weight percentage: 1%-10% pretilachlor technical, 1%-10% bensulfuron technical, 1%-10% bispyribac-sodium technical, 2%-6% wetting agent, 4%-15% dispersant, 0.5%-1.5% binder, 1%-10% disintegrant, 10%-40% corn starch adsorbent, and the balance being cenospheres. This composition is prepared into emulsifiable floating granules through processes such as dissolution, emulsification, adsorption, volatilization, and extrusion granulation. It combines the automatic emulsification and dispersion characteristics of emulsifiable concentrates with the convenient application features of water-dispersible granules. During its action, the active ingredients slowly desorb in water, automatically dispersing like emulsifiable concentrates until the active ingredient concentration is uniformly dispersed, eliminating the need for additional manual mixing. Furthermore, it has a long-lasting weed control effect, reduced environmental toxicity, and is beneficial to ecological balance.

Description

Technical Field

[0001] This invention belongs to the field of pesticide technology, specifically relating to an emulsifiable floating granule formulation for weed control in machine-transplanted rice fields and its preparation method. Background Technology

[0002] As an important product of modern agricultural development, especially the "Ten Thousand Mu of Fertile Land" project, machine-transplanted rice paddies not only eliminate the need for manual rice planting, saving labor costs, but also improve rice cultivation efficiency and avoid wasting seedbeds. Machine-transplanted paddies involve turning the roots before planting, resulting in larger row spacing and more open fields, providing favorable conditions for weed growth, especially during the rice's greening and early tillering stages. Currently, the main weeds in machine-transplanted paddies include barnyard grass, Echinochloa crus-galli, Paspalum distichum, Monochoria lactea, and Cyperus difformis, which require time-consuming and labor-intensive traditional pesticide spraying methods.

[0003] Pretilachlor is an amide herbicide, a highly effective, low-toxicity, broad-spectrum pre-emergence selective herbicide. When used as a soil treatment, it can control barnyard grass, sedge, bulrush, duckweed, and narrow-leaved water plantain in rice paddies. It is typically applied 3-5 days before transplanting. However, when applied alone, its selectivity for wet-transplanted rice is relatively poor.

[0004] Mefenacet is an amide herbicide, a systemic pre-emergent herbicide that is mainly absorbed through the coleoptile and roots. It is used to control grassy weeds in rice paddies and is particularly effective against barnyard grass and rice barnyard grass. Due to its low solubility in water, its herbicidal activity is generally highest when applied under water-retentive conditions.

[0005] Bispyribac-sodium is a benzoic acid herbicide and a highly active acetolactate synthase (ASL) inhibitor. After being sprayed onto weeds, bispyribac-sodium is rapidly absorbed by the stems and leaves of the weeds, making it highly effective, broad-spectrum, and requiring low dosage. Bispyribac-sodium effectively controls barnyard grass and other grassy weeds in rice paddies, and also controls most broadleaf weeds, some sedges, and barnyard grass resistant to other herbicides.

[0006] Currently, common herbicide formulations typically include emulsifiable concentrates (ECs), suspension concentrates, and wettable powders. For example, pretilachlor technical grade is a viscous liquid with low water solubility; the mainstream formulations currently registered or patented are primarily ECs, prepared as suspension concentrates or water-dispersible granules. ECs and wettable powders are considered high-pollution formulations, and their registration is currently restricted, with their market size decreasing. Data shows that pretilachlor, under water-retaining conditions or when prepared as conventional granules, experiences oil-water separation due to its low water solubility, resulting in poor weed control. Bismuth subsalicylate degrades rapidly in water and has a short residual effect; preparing these active ingredients into ordinary granules or water-dispersible granules limits their efficacy. Furthermore, many rice varieties are sensitive to these chemical herbicides, and even conventional herbicide dosages can cause herbicide damage. To reduce the adverse effects of chemical herbicides on rice production, it is necessary to develop a herbicide with low dosage, high efficacy, and long-lasting action. Summary of the Invention

[0007] In view of the technical problems pointed out in the background art, the purpose of this invention is to provide an emulsifiable floating granule formulation for weed control in mechanized rice transplanting fields and its preparation method. Addressing the weed control characteristics and application methods of pretilachlor, bensulfuron-methyl, and bispyribac-sodium, this invention provides a weed control composition for mechanized rice transplanting fields. This composition is prepared into emulsifiable floating granules through processes such as dissolution, emulsification, adsorption, volatilization, and extrusion granulation, making it convenient to apply and providing significant weed control efficacy.

[0008] The present invention first provides a weed control composition for rice transplanting fields, the active components of which are composed of pretilachlor, bensulfuron-methyl and bispyribac-sodium, with the mass ratio of pretilachlor, bensulfuron-methyl and bispyribac-sodium being 1-10:3.5-5:1-10; preferably, the mass ratio of pretilachlor, bensulfuron-methyl and bispyribac-sodium is 5:3.5:1.5.

[0009] The present invention further provides an emulsifiable floating granule comprising the above-mentioned herbicidal composition. Based on previous experience and actual efficacy tests, the applicant has selected the total weight of the active ingredients to be 5%-20%, preferably 8%-16%, further preferably 10-16%, and more preferably 10%. That is, 5% pretilachlor, 3.5% bensulfuron-methyl, and 1.5% bispyribac-sodium.

[0010] As one of the preferred technical solutions for the above-mentioned emulsifiable floating granules containing a herbicidal composition, the granules comprise, by weight percentage: 8%-16% of the herbicidal composition, 5%-20% of the emulsifier, 2%-6% of the wetting agent, 5%-12% of the dispersant, 0.5%-1.5% of the binder, 5% of the disintegrant, 25-35% of the adsorbent, and the balance being cenospheres.

[0011] Furthermore, the emulsifiable floating granules comprise, by weight percentage: 10%-16% of the herbicidal composition, 10%-20% of the emulsifier, 3%-6% of the wetting agent, 8%-12% of the dispersant, 0.5%-1.5% of the binder, 5% of the disintegrant, 25-32% of the adsorbent, and the balance being cenospheres.

[0012] Furthermore, the emulsifiable floating granules comprise, by weight percentage: 10% of the herbicidal composition, 10% of the emulsifier, 3% of the wetting agent, 8% of the dispersant, 1% of the binder, 5% of the disintegrant, 25-32% of the adsorbent, and the balance being cenospheres.

[0013] The emulsifier described in this invention is an alkyl (C) 10 -C 16 ) Calcium benzenesulfonate, ammonium alkylbenzenesulfonate, sodium salt of fatty alcohol polyoxyethylene ether sulfate, sodium salt of alkylphenol polyoxyethylene ether sulfate, sodium salt of arylphenol polyoxyethylene ether sulfate, alkyl phosphate salt, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, fatty amine polyoxyethylene ether, alkylphenol polyoxyethylene ether formaldehyde condensate, alkylphenol polyoxyethylene polyoxypropylene ether, vegetable oil polyoxyethylene ether, polyoxyethylene ether fatty acid ester, ethylene oxide / propylene oxide block copolymer, sorbitan ester ether, polyglycerol fatty acid ester, etc., preferably ethylene oxide / propylene oxide block copolymer.

[0014] The wetting agent is an alkylbenzene sulfonate, alkyl sulfate, polyoxyethylene-polyoxypropylene block copolymer, alkylnaphthalene sulfonate, sodium alkyl succinate sulfonyl salt, sodium N-methyl taurate salt of fatty amide, sodium sodium polyoxyethylene ether sulfate of fatty alcohol, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene ether sulfate, alkylphenol polyoxyethylene ether succinate half ester sulfonate, alkylphenol polyoxyethylene ether formaldehyde condensate, alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, alkylphenol polyoxyethylene ether formaldehyde condensate succinate half ester sulfonate, lignin sulfonate, polycarboxylate, fatty alcohol polyoxyethylene ether, sodium alkyl diphenyl ether sulfonate, dimethyl octanediol, dimethyl octanediol ethylene oxide adduct, tetramethyl decanediol, tetramethyl decanediol ethylene oxide adduct, or organophosphate; preferably an alkyl sulfate.

[0015] The dispersant is a polyacrylate copolymer, sodium salt of alkyl naphthalene sulfonate formaldehyde condensate, lignin sulfonate, alkyl polyoxyethylene ether formaldehyde condensate, alkyl polyoxyethylene ether formaldehyde condensate sulfate, aralkyl polyoxyethylene ether formaldehyde condensate, aralkyl polyoxyethylene ether formaldehyde condensate sulfate, alkyl naphthalene sulfonate formaldehyde condensate, aralkyl naphthalene sulfonate formaldehyde condensate, sodium salt of aralkyl naphthalene sulfonate formaldehyde condensate, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether, fatty alcohol polyoxyethylene ether sulfate, fatty amide N-methyl taurate sodium salt, alkyl naphthalene sulfonate, glycerol fatty acid ester polyoxyethylene ether, vegetable oil ethylene oxide adduct, vegetable oil ethylene oxide adduct derivative, organophosphate ester; considering economic cost, sodium salt of alkyl naphthalene sulfonate formaldehyde condensate is preferred.

[0016] The binder is sodium carboxymethyl cellulose.

[0017] The disintegrant is ammonium sulfate, sodium sulfate, soluble starch, sodium bicarbonate, urea, or sodium chloride; sodium sulfate is preferred, but the manufacturer does not specify otherwise, and conventional disintegrants are acceptable.

[0018] For environmental protection reasons, the adsorbent is corn starch, with a weight ratio of 25%-35%; preferably 25%-32%.

[0019] The cenospheres described in this invention have a bulk density of 0.060 g / cm³. 3, The buoyancy rate is ≥99.98%.

[0020] This invention also provides a method for preparing an emulsifiable floating granule comprising a herbicidal composition, which is prepared through processes such as dissolution, emulsification, adsorption, volatilization, and extrusion granulation, specifically including the following steps:

[0021] ① Dissolve the technical grade of pretilachlor in a solvent, add emulsifier and stir until homogeneous;

[0022] ② Use corn starch to adsorb the pretilachlor emulsifiable concentrate solution while stirring to ensure the material is mixed evenly;

[0023] ③ Use static or boiling drying methods, with the temperature controlled at 50-60℃, to dry the ethanol contained in the above mixture until the solid content no longer changes.

[0024] ④ Mix the technical grade of bispyribac-sodium and bensulfuron-methyl with wetting agents, dispersants, binders, disintegrants and cenospheres. At this time, the fineness of the mixture is between 45μm and 100μm.

[0025] ⑤ The mixture is pulverized by airflow, with a particle size of 100% < 45 μm;

[0026] ⑥ Mix the solids of pretilachlor with the material after air jet milling, add 5%-20% purified water to the mixture, and knead until it can be formed into a ball by hand and crumbles when released.

[0027] ⑦ The mixture in step ⑥ is extruded using a screw extrusion granulator to form tiny particles with a particle size between 0.3-0.5 mm;

[0028] ⑧ Dry the granules at a temperature between 60-65℃ to remove moisture; ⑨ Screen the dried granules to obtain the desired emulsifiable floating granules.

[0029] In step ①, the solvent is used as a medium. The criteria for the selected medium are low dosage, high solubility for pretilachlor, and easy volatility after adsorption. The solvent of the medium is selected from aromatic solvent oil, white oil, methanol, ethanol, ethylene glycol, methyl oleate, soybean oil, and N-methylpyrrolidone; ethanol is preferred.

[0030] This invention emulsifies pretilachlor and combines it with two other active ingredients to prepare an emulsifiable floating granule, allowing pretilachlor to contact water in an emulsified state. Water-soluble bags are used for packaging, delaying the degradation of bispyribac-sodium upon contact with water. The more direct economic benefits are labor savings and ease of operation; in machine-transplanted rice fields, only the water-soluble bags need to be scattered at fixed points. It can be applied to machine-transplanted rice fields by manual or mechanical application.

[0031] Compared with the prior art, the present invention has at least one of the following advantages:

[0032] 1. This invention integrates the herbicidal mechanisms of pretilachlor, bensulfuron-methyl, and bispyribac-sodium, and uses the three active components in combination. The optimal ratio was determined through ratio screening experiments, which significantly improves the herbicidal effect, inhibits the growth of weeds at all stages, reduces the amount of active components used, reduces the phytotoxicity of herbicides to rice, and the herbicidal composition has a long herbicidal effect, reduced environmental toxicity, and is conducive to the development of ecological balance.

[0033] 2. Based on the pharmacological properties of pretilachlor, the concept of a solid emulsifiable concentrate is introduced. Through processes such as dissolution, emulsification, adsorption, volatilization, and extrusion granulation, the composition is prepared into emulsifiable granules, combining the automatic emulsification and dispersion characteristics of emulsifiable concentrates with the convenient application features of water-dispersible granules. During the action period, the active ingredient in these granules slowly desorbs in water and automatically disperses like an emulsifiable concentrate until the active ingredient concentration is uniformly dispersed, without the need for additional manual mixing.

[0034] 3. The emulsifiable floating granules prepared by this invention overcome the problems of low solubility and fast degradation rate of pretilachlor and bispyribac-sodium in water. By forming an emulsion, the solubility of pretilachlor in water is increased, thereby achieving the technical effect of reducing dosage and increasing efficiency. Detailed Implementation

[0035] The present invention is described below through specific embodiments, but is not limited to the specific implementation examples given below.

[0036] Implementation Cases

[0037] The paddy field weed control composition comprises the following components in parts by weight: 1-10% pretilachlor as the active ingredient, 3.5-5% bensulfuron-methyl as the active ingredient, 1-10% bispyribac-sodium as the active ingredient, 5-20% emulsifier, 2-6% wetting agent, 5-12% dispersant, 1% sodium carboxymethyl cellulose as a binder, 5% sodium sulfate as a disintegrant, 25-32% corn starch as an adsorbent carrier, and the remaining cenospheres.

[0038] The active ingredients, pretilachlor, bensulfuron-methyl, and bispyribac-sodium, were sourced from Jiangsu Provincial Agricultural Hormone Engineering Technology Research Center Co., Ltd., and their purity met relevant quality requirements. The emulsifiers were selected from Nouryon's Ethylan NS-500LQ or SoprophorFD sodium salt of fatty alcohol polyoxyethylene ether sulfate, an ethylene oxide / propylene oxide block copolymer. The wetting agents were alkyl sulfates sourced from Synesqo Additives Company's Geropon L-WET-P or TENSIOFIX BCZ sodium salt of fatty amide N-methyl taurate. The dispersants were alkyl naphthalene sulfonic acid formaldehyde condensate sodium salt sourced from Nouryon Additives Company, trade name Morwet D-425 or Agrilan 700 polyacrylate copolymer. Corn starch was provided by Shandong Hongdou Food Co., Ltd. The cenospheres were provided by Zhejiang Haiyue New Material Co., Ltd., with a bulk density of 0.060 g / cm³. 3, The buoyancy rate is ≥99.98%. Example 1

[0039] The paddy field weed control composition by weight percentage is as follows: 5% pretilachlor, 3.5% benzyl sulfadiazine, 1.5% bispyribac-sodium, 10% ethylene oxide / propylene oxide block copolymer Ethylan NS-500LQ as emulsifier, 3% alkyl sulfate Geropon L-WET-P as wetting agent, 8% sodium alkyl naphthalene sulfonic acid formaldehyde condensate Morwet D-425 as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 25% corn starch as adsorbent carrier, and the balance being cenospheres.

[0040] The preparation method of emulsifiable floating granules includes the following steps:

[0041] ① Dissolve 5g of pretilachlor technical in 10g of ethanol, add 10g of emulsifier ethylene oxide / propylene oxide block copolymer, stir evenly to obtain pretilachlor emulsifiable concentrate solution;

[0042] ② Use 32g of corn starch to adsorb the pretilachlor emulsifiable concentrate solution while stirring to ensure the material is mixed evenly;

[0043] ③ Use static or boiling drying methods, with the temperature controlled at 50-60℃, to dry the ethanol contained in the above mixture until the solid mass no longer changes, to obtain the pretilachlor solids;

[0044] ④ Mix the technical grade of bispyribac-sodium and bensulfuron-methyl with wetting agents, dispersants, binders, disintegrants and cenospheres. At this time, the fineness of the mixture is between 45μm and 100μm.

[0045] ⑤ The mixture is pulverized by airflow, with a particle size of 100% < 45 μm;

[0046] ⑥ Mix the solids of pretilachlor with the material after air jet milling, add 5%-20% purified water to the mixture, and knead until it can be formed into a ball by hand and crumbles when released.

[0047] ⑦ The mixture in step ⑥ is extruded using a screw extrusion granulator to form tiny particles with a particle size between 0.3-0.5 mm;

[0048] ⑧ Dry the granules at a temperature between 60-65℃ to remove moisture.

[0049] ⑨ The dried granules are sieved to obtain the desired emulsifiable floating granules. Example 2

[0050] The paddy field weed control composition by weight percentage is as follows: 1% pretilachlor, 5% bensulfuron-methyl, 10% bispyribac-sodium, 10% ethylene oxide / propylene oxide block copolymer Ethylan NS-500LQ as emulsifier, 3% alkyl sulfate Geropon L-WET-P as wetting agent, 8% sodium alkyl naphthalene sulfonate formaldehyde condensate Morwet D-425 as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 32% corn starch as adsorbent carrier, and the balance being cenospheres. The preparation method is the same as in Example 1. Example 3

[0051] The paddy field weed control composition by weight percentage is as follows: 10% pretilachlor, 3.5% benzyl sulfadiazine, 1% bispyribac-sodium, 10% ethylene oxide / propylene oxide block copolymer Ethylan NS-500LQ as emulsifier, 3% alkyl sulfate Geropon L-WET-P as wetting agent, 8% sodium alkyl naphthalene sulfonate formaldehyde condensate Morwet D-425 as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 32% corn starch as adsorbent carrier, and the balance being cenospheres. The preparation method is the same as in Example 1. Example 4

[0052] The paddy field weed control composition by weight percentage is as follows: 10% pretilachlor, 3.5% benzyl sulfadiazine, 1% bispyribac-sodium sulfate (Soprophor FD) as emulsifier, 3% alkyl sulfate (Geropon L-WET-P) as wetting agent, 8% alkyl naphthalene sulfonic acid formaldehyde condensate sodium salt (Morwet D-425) as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 25% corn starch as adsorbent carrier, and the balance being cenospheres. The preparation method is the same as in Example 1. Example 5

[0053] The paddy field weed control composition by weight percentage is as follows: 10% pretilachlor, 3.5% benzyl sulfadiazine, 1% bispyribac-sodium sulfate (Soprophor FD) as emulsifier, 3% TENSIOFIX BCZ (Texamid N-methyl taurate) as wetting agent, 8% Morwet D-425 (alkyl naphthalene sulfonic acid formaldehyde condensate) as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 32% corn starch as adsorbent carrier, and the balance being cenospheres. The preparation method is the same as in Example 1. Example 6

[0054] The paddy field weed control composition by weight percentage is as follows: 5% pretilachlor, 3.5% benzyl sulfadiazine, 1.5% bispyribac-sodium, 10% ethylene oxide / propylene oxide block copolymer Ethylan NS-500LQ as emulsifier, 3% alkyl sulfate Geropon L-WET-P as wetting agent, 8% polyacrylate copolymer Agrilan 700 as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 32% corn starch as adsorbent carrier, and the balance being cenospheres. Example 7

[0055] The paddy field weed control composition by weight percentage is as follows: 5% pretilachlor, 3.5% benzyl sulfadiazine, 1.5% bispyribac-sodium, 5% ethylene oxide / propylene oxide block copolymer Ethylan NS-500LQ as emulsifier, 2% alkyl sulfate Geropon L-WET-P as wetting agent, 5% sodium alkyl naphthalene sulfonic acid formaldehyde condensate Morwet D-425 as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 32% corn starch as adsorbent carrier, and the balance being cenospheres. Example 8

[0056] The paddy field weed control composition by weight percentage is as follows: 5% pretilachlor, 3.5% benzyl sulfadiazine, 1.5% bispyribac-sodium, 20% ethylene oxide / propylene oxide block copolymer Ethylan NS-500LQ as emulsifier, 6% alkyl sulfate Geropon L-WET-P as wetting agent, 12% sodium alkyl naphthalene sulfonic acid formaldehyde condensate Morwet D-425 as dispersant, 1% sodium carboxymethyl cellulose as binder, 5% sodium sulfate as disintegrant, 25% corn starch as adsorbent carrier, and the balance being cenospheres. Comparative Example 1

[0057] The difference between this comparative example and Example 1 is that the pretilachlor technical material is not emulsified and is directly adsorbed with corn starch; the other steps are the same as in Example 1.

[0058] Comparing Examples 1, 4-7, and Comparative Example 1: Example 4 exhibited poor emulsification and dispersion performance after being added to water; Example 5 showed slow wetting effect upon adding water; Example 6 resulted in severe heat generation during the formulation extrusion process, leading to coarse particles, making it unsuitable for large-scale production; Example 7's reduced emulsifier dosage affected the herbicide's efficacy; Example 8's herbicide, due to its high emulsifier, wetting agent, and dispersant dosages, did not conform to the concept of green energy conservation and was not recommended for use; Comparative Example 1 showed no emulsification effect, and the pretilachlor technical material easily suspended in the solution as oil droplets, forming a precipitate.

[0059] Examples 1-3 and Comparative Example 1 were applied to control barnyard grass in paddy fields at a rate of 400g / mu. The weed control efficacy of Example 1 was over 95%; that of Example 2 was 90%; that of Example 3 was 80%; and that of the comparative example was over 70%.

[0060] Efficacy tests were conducted on the above-mentioned granular products. The control drugs were bensulfuron-methyl·bispyribac-methyl·pyrimisulfuron fine granules (Jiangsu Provincial Hormone Research Institute Co., Ltd.) and 69% bensulfuron-methyl·bensulfuron wettable powder (Jiangsu Kuida Agrochemical Co., Ltd.). A blank control was set up.

[0061] The test site is located in Longwangmiao Village, Chunhua Town, Changsha County, Hunan Province (28.18°N, 113.17°E), belonging to the hilly double-cropping rice area. More than 100 hectares of rice are planted in large continuous plots throughout the year. The test field has a rich variety of weeds. The main weeds in the paddy field are Echinochloa crusgalli, Leptochloa chinensis, Monochoria vaginalis, Lindernia procumbens, Rotala indica, Cyperus difformis, etc. The occurrence amount is large, and it can represent the local weed occurrence situation. The soil fertility is uniform, and the field surface is plowed and harrowed flat.

[0062] Rice variety: Nongxiang 25

[0063] Cultivation method: machine transplanting

[0064] Main weeds: Echinochloa crusgalli Echinochloa crusgalli (L.) Beauv., Monochoria vaginalis Monochorion vaginal (Burm.f.) Presl ex Kunth, Lindernia procumbens Lindernia procumbens (Krock.) Philcox

[0065] Table 1 Experimental design:

[0066]

[0067] Plot area: 20 m 2 .

[0068] Number of replicates: 3 times, arranged in a completely random block design.

[0069] Using the broadcasting method, the application rates are 480 g a.i. / hm 2 , 600 g a.i. / hm 2 , 960 g a.i. / hm 2 .

[0070] Record relevant data such as meteorological data, field management data, survey data, survey time and frequency during pesticide application.

[0071] Survey method:

[0072] According to the "Pesticide Field Efficacy Test Guidelines (I)" GB / T 17980.40 - 2000, the control efficacy calculation method is as follows: Control efficacy (%) = ×100 (1)

[0073] In the formula: PT - the number of remaining weeds (or fresh weight) in the treatment area

[0074] CK - the number of living weeds (or fresh weight) in the blank control area

[0075] Experimental results:

[0076] Table 2 The plant control efficacy (%) of bensulfuron-methyl·bispyribac-sodium·oxadiazon granules on weeds in machine-transplanted rice fields

[0077] —After applying the medicine 20 d

[0078]

[0079] Table 3. Control efficacy (%) of propargite-benzyl-methyl-bispyribac-sodium granules against weeds in machine-transplanted rice fields.

[0080] —After applying the medicine 40 d

[0081]

[0082] Table 4. Fresh weight control efficacy (%) of propargite-benzyl-methyl-bispyribac-sodium granules against weeds in machine-transplanted rice fields.

[0083] —After applying the medicine 40 d

[0084]

[0085] Compared with the control agent, 10% propargite·benzyl thiamethoxam·bispyribac-sodium granules have excellent control effects on weeds such as barnyard grass, duckweed, and wild vegetable in rice transplanting fields, and have good safety for machine-transplanted indica rice, making them suitable for weed control in machine-transplanted rice fields.

[0086] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for preparing an emulsifiable floating granule, characterized in that, Includes the following steps: (1) Dissolve the technical grade of pretilachlor in a solvent, add an emulsifier and stir until uniform to obtain a pretilachlor emulsifiable concentrate solution; add the pretilachlor emulsifiable concentrate solution to an adsorbent, stir and mix until uniform, and dry to constant weight to obtain material A; (2) Mix the technical grade of bispyribac-sodium and bensulfuron-methyl with wetting agent, dispersant, binder, disintegrant and cenospheres evenly, and then perform air jet milling to control the maximum particle size <45μm; to obtain material B; (3) Mix material A and material B evenly, add 5-20% water to wet, and obtain material C; (4) The material C is extruded and granulated to obtain wet granules with a particle size of 0.3-0.5 mm; (5) Dry and sieve to obtain emulsifiable floating granules; The mass ratio of pretilachlor, bensulfuron-methyl, and bispyribac-sodium is 1-10:3.5-5:1-10.

2. The method for preparing emulsifiable floating granules according to claim 1, characterized in that, The mass ratio of pretilachlor, bensulfuron-methyl, and bispyribac-sodium is 5:3.5:1.

5.

3. The method for preparing emulsifiable floating granules according to claim 1, characterized in that, The emulsifiable floating granules comprise, by weight percentage: 8%-16% herbicidal composition, 5%-20% emulsifier, 2%-6% wetting agent, 5%-12% dispersant, 0.5%-1.5% binder, 5% disintegrant, 25-35% adsorbent, and the balance being cenospheres; the herbicidal composition is composed of pretilachlor, bensulfuron-methyl, and bispyribac-sodium.

4. The method for preparing emulsifiable floating granules according to claim 3, characterized in that, The emulsifiable floating granules comprise, by weight percentage: 10%-16% herbicidal composition, 10%-20% emulsifier, 3%-6% wetting agent, 8%-12% dispersant, 0.5%-1.5% binder, 5% disintegrant, 25-32% adsorbent, and the balance being cenospheres.

5. The method for preparing emulsifiable floating granules according to claim 1, characterized in that, The emulsifier is selected from one or more of the following: calcium alkylbenzene sulfonate, ammonium alkylbenzene sulfonate, sodium salt of fatty alcohol polyoxyethylene ether sulfate, sodium salt of alkylphenol polyoxyethylene ether sulfate, sodium salt of arylphenol polyoxyethylene ether sulfate, alkyl phosphate salt, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, fatty amine polyoxyethylene ether, alkylphenol polyoxyethylene ether formaldehyde condensate, alkylphenol polyoxyethylene polyoxypropylene ether, vegetable oil polyoxyethylene ether, polyoxyethylene ether fatty acid ester, ethylene oxide / propylene oxide block copolymer, sorbitan ester ether, and polyglycerol fatty acid ester.

6. The method for preparing emulsifiable floating granules according to claim 1, characterized in that, The wetting agent is one or more of the following: alkylbenzene sulfonate, alkyl sulfate, polyoxyethylene-polyoxypropylene block copolymer, alkylnaphthalene sulfonate, sodium alkyl succinate sulfonate, sodium fatty amide N-methyl taurate, sodium fatty alcohol polyoxyethylene ether sulfate, alkylphenol polyoxyethylene ether, alkylphenol polyoxyethylene ether sulfate, alkylphenol polyoxyethylene ether succinate half ester sulfonate, alkylphenol polyoxyethylene ether formaldehyde condensate, alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, alkylphenol polyoxyethylene ether formaldehyde condensate succinate half ester sulfonate, lignin sulfonate, polycarboxylate, fatty alcohol polyoxyethylene ether, sodium alkyl diphenyl ether sulfonate, dimethyl octanediol, dimethyl octanediol ethylene oxide adduct, tetramethyl decanediol, tetramethyl decanediol ethylene oxide adduct, and organophosphate ester.

7. The method for preparing emulsifiable floating granules according to claim 1, characterized in that, The dispersant is one or more of the following: polyacrylate copolymer, sodium salt of alkyl naphthalene sulfonate formaldehyde condensate, lignin sulfonate, alkyl polyoxyethylene ether formaldehyde condensate, alkyl naphthalene sulfonate, glycerol fatty acid ester polyoxyethylene ether, vegetable oil ethylene oxide adduct, and vegetable oil ethylene oxide adduct derivative.

8. The method for preparing emulsifiable floating granules according to claim 1, characterized in that, The selected binder is sodium carboxymethyl cellulose; and / or, the disintegrant is one or more of ammonium sulfate, sodium sulfate, soluble starch, sodium bicarbonate, urea, and sodium chloride; and / or, the adsorbent is corn starch.

9. The method for preparing emulsifiable floating granules according to claim 1, characterized in that, The solvents used in step (1) are one or more of the following: aromatic solvent oil, white oil, methanol, ethanol, ethylene glycol, methyl oleate, soybean oil, and N-methylpyrrolidone.

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