Paddy field soil sealing weeding composition and application thereof

Abstract

The invention belongs to the field of pesticide chemistry application, and particularly relates to a weeding composition with synergistic interaction and weed resistance treatment and application thereof.The weeding composition is composed of bensulfuron methyl, benzobicylon, butachlor and fenclorim active ingredients, and the weight ratio of bensulfuron methyl to benzobicylon to butachlor to fenclorim is 1: (1-3): (20-40): (2-5). The dispersible oil suspending agent is prepared through dosage form processing, is diluted with water to form a homogeneous liquid, is applied in the early stage of rice germination acceleration and barnyard grass germination in direct seeding rice fields, and has an excellent prevention and treatment effect on amide-resistant moleplant seeds.

Description

Technical Field

[0001] The present invention belongs to the technical field of agricultural chemical applications, and specifically relates to a paddy field soil sealing herbicide composition, which is composed of bensulfuron-methyl, bicyclon-butyl, butachlor, and fenpyralid active ingredients. The composition is applied to rice fields for germination and sowing, and for controlling annual weeds in rice fields by applying pesticides before weeds germinate. Background Art

[0002] my country's rice cultivation methods include direct-seeding rice, transplanted rice, and ratoon rice. Direct-seeding rice is divided into water-seeded and dry-seeded methods, while transplanted rice is divided into manual transplanting, machine transplanting, and broadcasting. Water-seeded rice is labor-saving and low-cost during cultivation, but weeds grow simultaneously with the rice, making weed control challenging. Weed control in water-seeded rice generally adopts a "one kill, two kill, three supplement" strategy. The first step is to level the field and moisten the field to eliminate waterlogging. Then, the germinated and whitened rice grains are evenly spread in the field. Soil sealing is then carried out using Nongdes (10% bensulfuron-methyl wettable powder), 10% pyrazosulfuron-methyl wettable powder, 30% pretilachlor emulsifiable concentrate, and a combination of bensulfuron-methyl and pretilachlor. However, with the development of amide weed resistance, pretilachlor's sealing effect on Leptochloa chinensis and Echinochloa crus-galli is less than ideal. After 16 years of professional technical accumulation and a lot of effort in the research and development of water-based direct seeding sealing agents, I have finally developed a highly effective sealing herbicide combination that can be used for water-based direct seeding. This combination not only has a highly effective control effect on resistant Leptochloa crus-galli that current direct-seeded rice sealing agents cannot control, but also has excellent control effects on annual weeds such as barnyard grass, Polygonum sylvestris, Ligusticum chuanxiong, and Cyperus heterophyllus in the fields. Moreover, this product has excellent safety when used on indica, japonica, and glutinous hybrid rice.

[0003] Bensulfuron-methyl is a selective systemic sulfonylurea herbicide that is mainly absorbed through the roots and leaves of weeds and transmitted to the whole plant, inhibiting the synthesis of branched-chain amino acids, hindering cell division, and gradually killing the weeds. It has a good preventive effect on sweet potato, Polygonum multiflorum, Duck tongue grass, Potamogeton chinensis, Cyperus rotundus, and Cattleya arvense. With 30 years of use, the resistance of bensulfuron-methyl to Polygonum multiflorum, Cyperus rotundus, Cyperus dimorphus, and Cattleya arvense has increased year by year, and the control effect of single use is not ideal.

[0004] Butachlor is a selective, systemic amide herbicide. It is absorbed primarily through weed shoots and young secondary roots, inhibiting cell growth by hindering protein synthesis. It is effective against annual weeds such as barnyardgrass, Leptochloa chinensis, Cyperus diversiformis, and Cyperus rotundus. However, due to the frequent use of amides over the past 20 years and the development of cross-resistance, their effectiveness against barnyardgrass, Leptochloa chinensis, and Cyperus diversiformis has been suboptimal.

[0005] Bicyclazone is a bicyclic octene trione herbicide and an HPPD inhibitor. It blocks carotenoid synthesis, causing weed leaves to bleach and die. It has some effectiveness against firefly rush, Cyperus diversifolius, Echinochloa crusgalli, and Leptochloa chinensis. Bicyclazone is safe for japonica rice but poses some safety risks to indica rice, potentially causing bleaching and seedling death. The recent increase in indica rice planting area and the decline in japonica rice planting area in China have hindered the application and promotion of bicyclazone in my country.

[0006] The China Pesticide Information Network provides the following: Limin Chemical Co., Ltd.'s PD20250421 24% Pretilachlor·Bicyclotrione Dispersible Oil Suspension Concentrate, registered for foliar spraying in rice transplanting fields, with the label specifically emphasizing that it should not be used in indica rice fields. Jiangxi Zhongxun Agrochemical Co., Ltd.'s PD20250163 20% Ethoxysulfuron·Bicyclotrione Dispersible Oil Suspension Concentrate, registered for spraying in rice transplanting fields, with the label specifically emphasizing that indica rice is sensitive and should not be used in indica rice fields. Japan Styx Bioscience Co., Ltd.'s PD20181275 25% Bicyclotrione SC, registered for spraying in direct-seeded and transplanted rice fields, with the label emphasizing that it should not be used in indica rice fields.

[0007] The following were retrieved from the China Patent Network: 1) Patent No. CN111328815B, entitled "A herbicide composition containing bicyclon-1, oxaziclomefone, and butachlor, and its use." Field application examples indicate that this composition is applied to rice after transplanting and returning to green, and does not involve research on application technology after rice germination. 2) Patent No. CN103348981B, entitled "A rice field herbicide formulated with bicyclon-1, does not involve application after rice germination." 3) Patent No. CN108739834B, entitled "A herbicide composition containing penoxsulam, does not involve application after rice germination." Summary of the Invention

[0008] The purpose of the present invention is to provide a paddy field soil sealing herbicide composition to solve the problem of difficult weed control in direct-seeding paddy fields.

[0009] In order to fully illustrate the advantages of the present invention, the following technical solutions are now provided.

[0010] A paddy soil-sealing herbicide composition and its application. The composition comprises a mixture of the active ingredients bensulfuron-methyl, bicyclazone, butachlor, and fencloram. The mass ratio of bensulfuron-methyl:bicyclazone:butachlor:fencloram is 1:1-3:20-40:2-5. From the perspectives of economic benefits and increased efficiency and reduced dosage, the paddy soil-sealing herbicide composition preferably has a weight ratio of bensulfuron-methyl:bicyclazone:butachlor of 1:1:30, and a weight ratio of butachlor:fencloram of 8:1.

[0011] The herbicidal composition and application thereof of the present invention are characterized in that a solvent and an emulsifier are added to bensulfuron-methyl, bicyclazone, butachlor and fenclorac to prepare a dispersible oil suspension concentrate, wherein the weight ratio of bensulfuron-methyl, bicyclazone and butachlor is 30-50%.

[0012] The herbicidal composition of the present invention is characterized in that the herbicidal composition is applied to direct-seeding fields of rice (indica rice, japonica rice, glutinous rice), sown after the rice is germinated, and the weeds are applied at the early stage of germination.

[0013] The herbicidal composition of the present invention is characterized in that it has a good blocking effect on amide-resistant Leptochloa chinensis.

[0014] The herbicidal composition of the present invention is used to prepare a dispersible oil suspension concentrate which is diluted with water to become a homogeneous state and is sprayed on the soil for controlling annual weeds in rice fields.

[0015] Compared with the prior art, the present invention has the following excellent effects.

[0016] This invention overcomes existing application limitations for bicyclazone. Official data indicates that bicyclazone carries significant risks when used on indica rice. However, this invention has no specific application restrictions on rice varieties and is safe for use on indica, japonica, and glutinous rice.

[0017] The present invention overcomes the existing technical barriers of soil-sealed direct seeding. Because rice is in its early germination stage, it is sensitive to pesticides and has limited suitable applications. The most common pesticides are bensulfuron-methyl, pretilachlor, and pyrazosulfuron-methyl. These can easily lead to pesticide damage if not handled with caution. The present invention is highly safe for use after accelerated germination of rice.

[0018] The present invention breaks through the existing technical barriers of water-direct seeding and soil-sealed application, and has excellent control effects on currently resistant barnyard grass, Leptochloa chinensis, Polygonum multiflorum, and Cyperus heterophyllus. DETAILED DESCRIPTION

[0019] The excellent effects of the present invention are described in detail with reference to the following examples, but it should be understood that the protection scope of the present invention is not limited by the specific examples.

[0020] Example 1 Detoxification of Butachlor and Fenpyralid on Rice The experimental agents were provided or prepared by Zhejiang Tianfeng Biological Science Research Institute. The agents involved were 60% butachlor emulsifiable concentrate, 20% fencloram microemulsion, and Jiangxi resistant barnyardgrass.

[0021] Zheyou hybrid indica rice was pre-germinated until just white, and uniform, newly white rice kernels were selected, with 30 kernels placed in each pot. A 3WP-2000 traveling spray tower from the Nanjing Agricultural Mechanization Research Institute of the Ministry of Agriculture and Rural Affairs was used for spraying according to the designed spraying method, at a spray rate of 250 mm / s.

[0022] Table 1 Effects of different ratios of butachlor and fencloram on the safety of rice and the blocking effect on Echinochloa crusgalli in Jiangxi Province 10 days after application From the perspective of rice safety and herbicidal efficacy, butachlor without a safener, applied after rice germination, resulted in a germination rate of only 20%, while achieving a 75% control efficacy against resistant barnyardgrass. Mixing butachlor and fencloram in ratios of 16:1, 8:1, and 4:1, applied after rice germination, increased rice germination rates to 90%, 95%, and 95%, respectively, while achieving 72%, 68%, and 65% control efficacy against resistant barnyardgrass, respectively. This suggests that a butachlor / fencloram ratio of 4-16:1, applied after rice germination, is safe for rice and suitable for use. Considering both economic benefits and reduction in residue, an 8:1 ratio of butachlor to fencloram is preferred.

[0023] Example 2 Determination of synergistic effect on Longyou-resistant Leptochloa chinensis The experimental agents were provided or prepared by Zhejiang Tianfeng Biological Science Research Institute. These agents included 25% cycloheximide SC (without synergists), 60% butachlor emulsifiable concentrate (butachlor:fenac = 8:1) (without synergists), and 10% bensulfuron-methyl suspension concentrate.

[0024] Pre-plant the Longyou kiwifruit (Zhejiang Longyou kiwifruit) and evenly sow it in pots and pans, then cover lightly with soil until ready for use. Pre-germinated rice grains were evenly placed in pots, 30 grains per pot, and lightly covered with soil until ready for use. To ensure the experiment more closely resembles field data, all cultivation, from sowing to pesticide application to observation, was carried out outdoors. Three replicates were set for each treatment, with one blank treatment also included.

[0025] The 3WP-2000 walking spray tower of the Nanjing Agricultural Mechanization Research Institute of the Ministry of Agriculture and Rural Affairs was used for spraying according to the design scheme. The control effect was observed 15 days after the application. The evaluation method was based on the Colby method formula: , A, B, C represent the actual weed survival rate of a single dose (%); E represents the theoretical survival rate (%); E-E0≤-10%, synergistic effect, -10%>E-E0<10%, additive effect, E-E0≥10%, antagonistic effect.

[0026] Table 2 Combined toxicity test of bensulfuron-methyl, cypermethrin, and butachlor (butachlor: cypermethrin 8:1) on resistant Leptochloa chinensis 15 days after treatment Indoor interactive tests showed that bensulfuron-methyl at an effective concentration of 0.05 g / L had a 0% control effect on resistant Leptochloa chinensis; oxabicyclon at 0.05, 0.1, and 0.15 g / L had control effects of 20%, 30%, and 55%, respectively; butachlor + fencloram (butachlor:fencloram 8:1) at 1.0 g / L, 0.125 g / L, 1.5 g / L, 0.1875 g / L, and 2 g / L, 0.25 g / L, had control effects of 15%, 20%, and 35%, respectively. Mixtures of bensulfuron-methyl, oxabicyclon, butachlor, and fencloram all showed synergistic effects on resistant Leptochloa chinensis, with the most significant synergistic effects observed at ratios of 1:1:30 and 1:2:30 for bensulfuron-methyl:oxabicyclon:butachlor, with the ratio of butachlor:fencloram being 8:1.

[0027] Based on the Ministry of Agriculture and Rural Affairs' requirements for reducing the use of pesticides and increasing their efficiency as well as their commercial application value, the preferred weight ratio of bensulfuron-methyl, bicyclon-butyl: butachlor is 1:1:30, among which the ratio of butachlor: fenpyroxicam is 8:1.

[0028] Example 3: Field Trial of a Technological Breakthrough in the Application of Bicyproconazole. The trial was conducted in Longyou, Zhejiang Province. Indica hybrid rice was planted in batches according to plan. Manual spraying was performed after the rice germinated and whitened (0-2 leaves), at the 3rd leaf stage, and at the 5th leaf stage. The safety of the rice was observed 5 days after the application.

[0029] Table 3 Investigation of rice safety and weed control effects in the field Experiments have shown that, under existing technology, the application of bicyclazone to rice stems and leaves during the 3-leaf and 5-leaf stages is unsafe for rice. This indicates that, as stated on existing pesticide labels, bicyclazone is not suitable for indica rice varieties. However, the present inventors have demonstrated that the application of bicyclazone to rice during the germination and whitening (0-2 leaf stage) is safe for indica rice varieties. This represents a breakthrough in existing application technologies.

[0030] Example 4 Formulation Processing A 32% bensulfuron-methyl·bicyclazone·butachlor (1:1:30) dispersible oil suspension concentrate was prepared, comprising 1% bensulfuron-methyl, 1% bicyclazone, 30% butachlor, 3.75% fencloram, 8% calcium dodecylbenzenesulfonate (Nantong Deyi Chemical Co., Ltd.), 2% Ethylan NS-500LQ (Nouryon), 7% EMULSOGEN EL 360 (Clariant), 1% organobentonite (Zhejiang Anji Tianlong Organobentonite Co., Ltd.), and the remainder methylated soybean oil (Suzhou Fengbei Biotechnology Co., Ltd.). The mixture was ground in a sand mill to a D90 value of 5 μm.

[0031] Example 5 Formulation Processing A 33% bensulfuron-methyl·bicyclazone·butachlor (1:2:30) dispersible oil suspension concentrate was prepared, comprising 1% bensulfuron-methyl, 2% bicyclazone, 30% butachlor, 3.75% fenpyroximate, 7% calcium dodecylbenzenesulfonate, 3% Ethylan NS-500LQ, 7% EMULSOGEN EL 360, 1% organobentonite, and the remainder methylated soybean oil. The mixture was ground in a sand mill to a D90 value of 5 μm.

[0032] Example 6 Formulation Processing: A 48% bensulfuron-methyl·bicyclazone·butachlor (1:1:30) dispersible oil suspension concentrate was prepared by grinding bensulfuron-methyl 1.5%, bicyclazone 1.5%, butachlor 45%, fenpyroximate 5.6%, calcium dodecylbenzenesulfonate 10%, Ethylan NS-500LQ 2%, EMULSOGEN EL 360 7%, organic bentonite 1%, and methylated soybean oil as the remainder, with the mixture being ground in a sand mill to a D90 of 5 μm.

[0033] Note: For clarification and illustration, the processing techniques for the dosage forms of Examples 4-6 of the present invention are well known to those skilled in the art. The differences between the formulations primarily stem from the percentage of active ingredient in the total weight and the ratio of the active ingredients. The types and amounts of excipients were kept consistent as much as possible, with only adjustments made to the lipophilic and hydrophilic ratios to reduce unnecessary experimental variables.

[0034] Example 7 Field plot test The experiment was conducted in Longyou, Zhejiang Province. The rice variety was hybrid indica rice, and the rice was directly seeded in the field. On the second day after the rice was germinated and sown, the weeds in the field included resistant Leptochloa chinensis, Echinochloa crus-galli, Cyperus rotundus, and Polygonum syringae. The above weeds had not yet germinated or were in the early stages of germination.

[0035] An agricultural electric sprayer (capacity of 18 kg / barrel) was used for spraying. The principle was to spray evenly and thoroughly. The target spray rate was 25 barrels of liquid per hectare. The safety of rice was investigated after 7 days, and the weed control effect in the field was investigated after 15 days.

[0036] Table 4 Investigation of rice safety and weed control effects in the field The test showed that the treatments of 32% benzylpyridinium·bicyclam·butachlor (1:1:30) and 33% benzsulfuron-methyl·bicyclam·butachlor (1:2:30) applied after germination of indica rice were safe for rice and had excellent blocking effects against Leptochloa chinensis, Echinochloa crusgalli, Polygonum syringae, and Cyperus rotundus. Compared with traditional agents butachlor and benzylpyridinium, bicyclam had the effect of broadening the herbicide spectrum and improving control of Leptochloa chinensis, Echinochloa crusgalli, Polygonum syringae, and Cyperus rotundus. Surprisingly, bicyclam was safe for indica rice varieties, surpassing previous technology (which had prohibited its use on indica rice).

[0037] Example 8 Field plot test The experiment was conducted in Yueyang, Hunan Province. The rice variety was hybrid glutinous rice and the rice was directly seeded in the field. On the second day after the rice was germinated and sown, other weeds in the field included resistant Leptochloa chinensis, Echinochloa crus-galli, Cyperus difformis, etc. The above weeds had not yet germinated or were in the early stages of germination.

[0038] An agricultural electric sprayer (capacity of 18 kg / barrel) was used for spraying. The principle was to spray evenly and thoroughly. The target spray rate was 25 barrels of liquid per hectare. The safety of rice was investigated after 7 days, and the weed control effect in the field was investigated after 15 days.

[0039] Table 5 Investigation of rice safety and weed control effects in the field The experiment shows that the treatment scheme of 32% benzylsulfuron-butyl-butachlor dispersible oil suspension concentrate (1:1:30) is applied after germination of glutinous rice, which is safe to rice and has excellent blocking effect on Leptochloa chinensis, Echinochloa crus-galli, Moschus chinensis, and Cyperus heterosexualus. The mixed preparation of 60% benzylsulfuron-methyl WDG and 30% pretilachlor emulsifiable concentrate has a control effect of 60%, 72%, 90%, and 60% on Leptochloa chinensis, Echinochloa crus-galli, Moschus chinensis, and Cyperus heterosexualus, respectively, which is significantly lower than the control effect of the patent of the present invention.

[0040] Example 9 Field plot test The experiment was conducted in Yueyang, Hunan Province. The rice variety was hybrid japonica rice, and the rice was directly seeded in the field. On the second day after the rice was germinated and sown, other weeds in the field included resistant Leptochloa chinensis, Echinochloa crus-galli, Commelina communis, and Rhizoma Cibotii. The above weeds had not yet germinated or were in the early stages of germination.

[0041] An agricultural electric sprayer (capacity of 18 kg / barrel) was used for spraying. The principle was to spray evenly and thoroughly. The target spray rate was 25 barrels of liquid per hectare. The safety of rice was investigated after 7 days, and the weed control effect in the field was investigated after 15 days.

[0042] Table 6 Investigation of rice safety and weed control effects in the field The test showed that the 48% benzylpyridinium-bicyclonone-butachlor dispersible oil suspension, applied after germination of japonica rice, was safe for rice and had excellent blocking effects on Leptochloa chinensis, Echinochloa crusgalli, Commelina dasyphylla, and Rhizoma Cibotii. A mixed formulation of 60% benzylsulfuron-methyl WDG, 60% butachlor emulsifiable concentrate, and 20% fenthiocarb microemulsion was also safe for rice, with control efficacy of 80%, 86%, 62%, and 58% against Leptochloa chinensis, Echinochloa crusgalli, Commelina dasyphylla, and Rhizoma Cibotii, respectively, significantly lower than the efficacy of the patented invention. A mixed formulation of 60% benzylsulfuron-methyl WDG and 60% butachlor emulsifiable concentrate was not safe for rice, with control efficacy of 81%, 85%, 65%, and 62% against Leptochloa chinensis, Echinochloa crusgalli, Commelina dasyphylla, and Rhizoma Cibotii, respectively.

[0043] The above embodiments are intended to demonstrate the advantages of the present invention. Any modifications, equivalent substitutions, or alterations made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention. It is also worth noting that the dosage form processing techniques of the present invention are all prior art and are well known to those skilled in the art.

Claims

1. A paddy field soil sealing herbicidal composition, characterized in that: The effective ingredients of the herbicidal composition are a mixture of bensulfuron-methyl, bicyclazone, butachlor and fenclorac, wherein the mass ratio of bensulfuron-methyl:bicyclazone:butachlor:fenclorac is 1:1-3:20-40:2-5.

2. The herbicidal composition according to claim 1, characterized in that The weight ratio of bensulfuron-methyl:bicyclon:butachlor is 1:1:30, and the weight ratio of butachlor:fenac is 8:

1.

3. The herbicidal composition according to claim 2, characterized in that Bensulfuron-methyl, bicyclam, butachlor and fenchlorpyrifos are added with a solvent and an emulsifier to prepare a dispersible suspension concentrate.

4. The herbicidal composition according to claim 3, characterized in that The weight ratio of bensulfuron-methyl, bicyclazone and butachlor is 30-80%.

5. The herbicidal composition according to claim 4, characterized in that The weight ratio of bensulfuron-methyl, bicyclazone and butachlor is 30-50%.

6. The herbicidal composition according to claim 1, characterized in that The herbicidal composition is applied to rice varieties including indica rice, glutinous rice and japonica rice.

7. The herbicidal composition according to claim 1, characterized in that The herbicidal composition is applied to the early germination stage of weeds after rice germination and sowing.

8. The herbicidal composition according to claim 7, characterized in that The herbicidal composition controls Leptochloa chinensis resistant to amide herbicides.

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