Paddy field herbicide composition as well as preparation method and application thereof

Abstract

The invention relates to the technical field of pesticides and fertilizers, in particular to a paddy field herbicide composition as well as a preparation method and application thereof. The herbicide composition for the paddy field comprises the following materials in percentage by weight: bensulfuron methyl, pretilachlor, clomazone, a safener, a carrier and a fertilizer. The preparation method comprises the following steps: mixing and screening masterbatch extruded particles (prepared from bensulfuron methyl, clomazone, pretilachlor, a safener, a carrier and a fertilizer such as ammonium sulfate and ammonium chloride), seaweed extract extruded particles (prepared from a fertilizer such as seaweed extract and ammonium chloride) and a fertilizer such as diammonium phosphate, urea, potassium chloride and zinc sulfate to obtain a qualified product. The paddy field herbicide composition has the weeding effect and the fertilizing effect after being applied once in paddy rice production, overcomes the defects of two or more times of herbicide and fertilizer application in the prior art, and is wider in herbicide controlling spectrum, better in weed control effect, less in herbicide dosage and capable of remarkably increasing the yield.

Description

Technical Field

[0001] The present invention relates to the technical field of pesticides and fertilizers, and in particular to a rice field herbicide composition, a preparation method and an application thereof, and specifically to a rice field herbicide fertilizer composition containing benzylsulfuron-methyl, clomazone and pretilachlor, a preparation method and an application thereof. Background Art

[0002] Pretilachlor, chemical name 2-chloro-2′,6′-diethyl-N-(2-propoxyethyl)acetanilide, molecular formula C 17 H 26 ClNO 2 , CAS: 51218-49-6, is a selective pre-emergence herbicide, which is mainly absorbed by the plant hypocotyl, mesocylinder and coleoptile, directly interfering with the protein synthesis in the weeds, and indirectly affecting photosynthesis and respiration, leading to the death of the weeds. Rice has a strong ability to decompose pretilachlor, so it has a certain selectivity. Pretilachlor can effectively control annual grasses and some broad-leaved weeds in rice fields, such as barnyard grass, duckweed, water amaranth, etc., but has poor control effect on sedge weeds.

[0003] Bensulfuron methyl, chemical name N-(4,6-dimethoxypyrimidin-2-yl) methyl o-formate benzylsulfonylurea, molecular formula C 16 H 18 N 4 O 7 S, CAS: 83055-99-6, is a selective systemic herbicide. The benzylsulfuron-methyl is an inhibitor of amino acid branched-chain synthesis, which selectively inhibits the biosynthesis of essential amino acids valine and isoleucine in organisms, prevents cell division, and stops plant growth. Benzylsulfuron-methyl is a systemic herbicide, which is absorbed by leaves and roots and moves rapidly in the meristem. Benzylsulfuron-methyl can be used to control broad-leaved weeds and sedge weeds such as Alisma orientalis, Duck tongue grass, Moshangcai, Dwarf Sagittaria, Dianthus, Water Cyperus, Water Amaranthus, and Cattle Felt, but has poor control effect on grass weeds in rice fields. When used alone, benzylsulfuron-methyl cannot completely control all weeds in rice fields.

[0004] Clomazone, chemical name 2-(2-chlorobenzyl)-4,4-dimethylisoxazolin-3-one, molecular formula C 12 H 14 ClNO 2 , CAS: 81777-89-1, by inhibiting the synthesis of isoprene compounds, hindering the biosynthesis of carotene and chlorophyll, inhibiting the biosynthesis of photosynthetic pigments of sensitive weeds, and killing sensitive weeds in a short period of time. Isopropylamine can be used to control broadleaf weeds and grass weeds, but it is ineffective against sedge weeds.

[0005] Based on this, in order to overcome the defects of bensulfuron-methyl, clomazone, and pretilachlor when used alone, the prior art (such as shown in CN117940016A) uses a variety of herbicides such as bensulfuron-methyl, clomazone, and pretilachlor in combination. However, there is no report on the combination of bensulfuron-methyl, clomazone, pretilachlor, safener, carrier and specific fertilizer to form a new rice field herbicide composition, and its preparation method and application.

[0006] In traditional agricultural production techniques, weeding and fertilizing of rice fields are separated, which increases the labor intensity and number of labors for farmers.

[0007] In actual use, most existing pesticides are often mixed with soil or sand, and then mixed with compound fertilizer (or urea).

[0008] During the mixing process, soil or sand must be found. Some farmlands may not have suitable dry soil next to them, so farmers need to go to far away places to get it, which brings great trouble to farmers and increases labor costs. Moreover, in reality, farmers often mix 30-50 grams of pesticides (such as herbicides) + 2 kilograms of dry soil, and then mix them with 10-20 kilograms of compound fertilizer (or urea). This often makes it impossible to mix pesticides and fertilizers evenly, and the amount of pesticides (such as herbicides) added is large, and the effect of weed control is not good; some pesticides will also react and decompose when mixed with fertilizers, which can easily cause pesticide damage, especially the consequences of herbicides are more serious, which will reduce the overall control effect of weeds. In addition, some pesticides are highly toxic, and farmers lack the necessary protection knowledge during the mixing process, and poisoning often occurs. The users (i.e. farmers) have a relatively low level of awareness. For the sake of simplicity, convenience and safety, they may even skip the step of adding soil and apply pesticides directly. This will cause a waste of pesticides, and the control effect is often not good, and may even lead to a decrease in rice yields. Summary of the invention

[0009] The present invention aims to provide a rice field herbicide composition and its preparation method and application, and specifically provides a rice field herbicide fertilizer granule containing benzsulfuron-methyl, clomazone, and pretilachlor and its preparation method and application. The rice field herbicide composition scientifically combines benzsulfuron-methyl, clomazone, pretilachlor, safener, carrier and specific fertilizer, has good stability, good weed control effect, and promotes early growth of rice. Users can prevent and kill weeds in rice fields by applying the rice field herbicide composition once in agricultural production, and can also use the rice field herbicide composition as base fertilizer, avoiding the situation that the application of medicine and fertilizer cannot be taken into account in the past, improving production efficiency and reducing labor costs. Moreover, the ratio of benzsulfuron-methyl, clomazone, pretilachlor, safener, carrier and selected fertilizer in the rice field herbicide composition is scientific, which not only expands the weed control spectrum, but also has good overall prevention effect on weeds. The preparation method of the rice field herbicide composition is simple in process and low in production cost.

[0010] To achieve the above object, the present invention provides a rice field herbicide composition, the material formula of which is as follows by weight percentage:

[0011]

[0012]

[0013] Fertilizer replenishment to 100%;

[0014] The safener is fenpyroximate, cloquintocet-mexyl or isoxadiazole;

[0015] The carrier is a mixture of one or more of kaolin, diatomaceous earth, pearl clay, quartz sand, stone powder and white carbon black;

[0016] The fertilizer is a mixture of multiple types of potassium dihydrogen phosphate, potassium chloride, potassium sulfate, potassium nitrate, urea, ammonium chloride, ammonium sulfate, monoammonium phosphate, diammonium phosphate, sodium molybdate, ammonium molybdate tetrahydrate, zinc sulfate, manganese sulfate, copper sulfate, seaweed essence, and silicon fertilizer.

[0017] Furthermore, the weight percentages of benzylsulfuron-methyl, clomazone and pretilachlor in the rice field herbicide composition are preferably 0.001%-0.01%, 0.01%-0.05% and 0.05-0.1%, respectively.

[0018] Furthermore, the safener is preferably fenchlorpyrifos, and the weight percentage of fenchlorpyrifos in the rice field herbicide composition is preferably 0.01%-0.1%.

[0019] Furthermore, the carrier is preferably one of kaolin and white carbon black or a mixture of the two, and the weight percentage of the carrier in the rice field herbicide composition is preferably 0.1-3%.

[0020] Furthermore, the fertilizer is a mixture of diammonium phosphate, urea, potassium chloride, ammonium sulfate, ammonium chloride, zinc sulfate and seaweed extract; the percentage of the fertilizer in the total weight of the paddy field herbicide composition is as follows:

[0021]

[0022] Ammonium chloride was added to make up to 100%.

[0023] Furthermore, the percentage of the fertilizer to the total weight of the paddy field herbicide composition is preferably:

[0024]

[0025]

[0026] Most preferably, the present invention provides a rice field herbicide composition, the material formula of which is as follows by weight percentage:

[0027]

[0028] Among them, the sum of the weight percentages of benzylsulfuron-methyl, clomazone and pretilachlor in the rice field herbicide composition is 0.11%.

[0029] The present invention also provides an application of a rice field herbicide composition, wherein the rice field herbicide composition is used for preventing and controlling weeds in rice nursery fields, rice direct-seeding fields, rice machine-transplanted rice fields, rice seedling-casting fields, and rice transplanting fields (such as barnyard grass, Leptochloa chinensis, dwarf arrowhead, wild arrowhead, flat-stem Scirpus, water bamboo leaves, oriental water plantain, knotweed, duckweed, four-leaf duckweed, pondweed, moss, Polygonum syringae, Cyperus rotundus, Cyperus difformis, Cyperus rotundus (Tripterygium wilfordii), felt, firefly rush, Channa intestine, and other annual and some perennial weeds).

[0030] Furthermore, the product formulation of the rice field herbicide composition is a granule; the granules of the rice field herbicide composition are used to control weeds in rice nursery fields, rice direct-seeding fields, rice machine-transplanted rice fields, rice seedling-casting fields, and rice transplanted fields, especially for controlling annual weeds in direct-seeding rice fields (such as barnyard grass, Leptochloa chinensis, dwarf arrowhead, wild arrowhead, flat-stem Scirpus, water bamboo leaves, Alisma orientalis, knotweed, duckweed, four-leaf duckweed, pondweed, moss, Polygonum syringae, Cyperus rotundus, Cyperus difformis, Cyperus rotundus (Tripterygium wilfordii), felt, firefly rush, Channa intestines and other annual and some perennial weeds).

[0031] Furthermore, the granules of the rice field herbicide composition are spread manually, spread by a spreading machine, mechanically spread in the air using a drone, or manually spread in the air using an agricultural aircraft.

[0032] The present invention also provides a method for preparing a paddy field herbicide composition, wherein the product dosage form of the paddy field herbicide composition is a granule; the fertilizer is a mixture of diammonium phosphate, urea, potassium chloride, ammonium sulfate, ammonium chloride, zinc sulfate and seaweed extract;

[0033] The preparation method of the rice field herbicide composition comprises the following preparation steps:

[0034] (1) Preparation of mother powder: The weighed benzylsulfuron-methyl, clomazone, pretilachlor, safener and carrier are subjected to air flow grinding and stirred to obtain mother powder;

[0035] (2) Preparation of mother drug extruded granules: weighed mother powder, ammonium sulfate and part of ammonium chloride are put into a disc mixer and mixed evenly, then crushed into powder by a chain mill, pre-screened, the qualified materials are humidified and stirred in a double-shaft mixer, and then enter the extrusion granulator for granulation (the materials that fail the pre-screening are transferred to the disc mixer, and the above process cycle is performed); the granulated materials enter the primary screening, and the qualified materials enter the drying machine for drying (the materials that fail the primary screening are transferred to the pre-screening through the fine return scraper, and the above process cycle is performed); the dried materials enter the cooling machine for cooling, and the cooled materials enter the fine screening again, and the qualified materials enter the coating machine for coating (the materials that fail the fine screening are transferred to the pre-screening through the fine screening return scraper, and the above process cycle is performed), to obtain mother drug extruded granules;

[0036] (3) Preparation of seaweed extract extruded particles: weighed seaweed extract and residual ammonium chloride are put into a disc mixer and mixed evenly, then crushed into powder by a chain mill, pre-screened, and the qualified materials are humidified and stirred in a double-shaft mixer, and then sent to an extrusion granulator for granulation (the materials that fail the pre-screening are transferred to the disc mixer, and the above process cycle is performed); the granulated materials are sent to the primary screen, and the qualified materials are sent to the dryer for drying (the materials that fail the primary screen are transferred to the pre-screen through a fine return scraper, and the above process cycle is performed); the dried materials are sent to a cooler for cooling, and the cooled materials are sent to a fine screen again, and the qualified materials are sent to a coating machine for coating (the materials that fail the fine screen are transferred to the pre-screen through a fine screen return scraper, and the above process cycle is performed), to obtain seaweed extract extruded particles;

[0037] (4) Preparation of 0.11% benzylsulfuron-methyl-isothiazolin-methyl-pretilachlor herbicide granules for rice fields: weighed mother drug extruded granules, seaweed extract extruded granules, diammonium phosphate, urea, potassium chloride and zinc sulfate are respectively put into a mixing drum through a batching belt for mixing; after sampling and testing, they are measured by a packaging scale, heat-sealed, sewn, stacked and stored.

[0038] Compared with the prior art, the present invention has at least the following beneficial effects:

[0039] The paddy field herbicide composition of the present invention (especially the paddy field herbicide composition granules) has the following advantages:

[0040] 1. High efficiency, safety, and a wide spectrum of weed control. Since the three herbicides (bensulfuron-methyl, clomazone, and pretilachlor) have different mechanisms of action in weeds, the combination of these three herbicides improves the weed control effect; combining these three herbicides with safeners, carriers, and specially selected fertilizers in a scientific ratio further improves the overall weed control effect and expands the weed control spectrum. Therefore, the paddy field herbicide composition of the present invention can effectively prevent and control all types of weeds in paddy fields (including weeds of Gramineae, Broadleaf Family, and Cyperaceae), and is safe for rice, overcoming the defects of bensulfuron-methyl, clomazone, and pretilachlor when used alone, solving most of the weed problems in paddy fields, and having both sealing and weed control effects.

[0041] 2. The paddy field herbicide composition of the present invention scientifically combines three herbicides with fertilizers, so that it has the characteristics of both pesticides and fertilizers, is easy to use, and can achieve the two purposes of weeding and applying base fertilizer in one application, avoiding the mixing and secondary application in the agricultural production process, reducing labor costs; it also avoids the harm of pesticides to farmers when mixing and using, and is safer to use; and effectively avoids the problem of large amount of pesticides (such as herbicides) added and poor weed control effect caused by mixing and using, with a wider weed control spectrum, better control effect, and less input of pesticides (such as herbicides). In addition, compared with existing operations, the paddy field herbicide composition granules of the present invention are more convenient to use, without spraying or mixing with soil for spreading, and the granules can be directly spread into the field, which improves production efficiency, effectively reduces labor intensity, saves labor costs and protects farmers' health. Agriculture is vital and irreplaceable to national life and even human survival. Therefore, the paddy field herbicide composition of the present invention has a huge effect on agricultural production such as rice.

[0042] 3. The paddy field herbicide composition (especially the paddy field herbicide composition granules) of the present invention has the characteristics of good fluidity, good film formation and gloss, good wear resistance, no sticky particles agglomeration, no shedding, no dust, and high safety. The formulation is safe and environmentally friendly, avoiding the pollution of the environment by the organic solvent in the emulsifiable concentrate, and also avoiding the potential safety hazards of the dust generated by the wettable powder to the operator (such as causing inhalation by the operator, causing irritation to the skin and eyes, etc.).

[0043] 4. The granular formulation of the rice field herbicide composition of the present invention is economical and environmentally friendly. The preparation method of the granular formulation of the rice field herbicide composition of the present invention has a simple process and low production cost. The use of this formulation for agricultural production can save packaging and fillers of pesticides, and can also save repeated transportation of pesticides and fertilizers, which can save money for users. Moreover, since many pesticide adjuvants are mostly xylene, stone powder, etc., these are polluting to the environment. The granular formulation of the rice field herbicide composition of the present invention does not need to introduce other adjuvants such as dispersants, wetting agents, organic solvents, surfactants, etc., and the pollution to the environment is greatly reduced.

[0044] 5. The paddy field herbicide composition of the present invention is based on the fertilizer requirement law of direct-seeded rice growth and development. The application of nitrogen, phosphorus and potassium fertilizers at the optimal period for the application of rice herbicides and fertilizers (that is, before the paddy field is plowed and leveled) is beneficial to the rapid absorption of nutrients by rice. The paddy field herbicide composition of the present invention is combined with a variety of specially selected fertilizers such as zinc sulfate and seaweed extract to ensure the healthy growth of rice with sufficient trace elements, effectively prevent rice from setting roots, enhance rice's resistance to stress, and reduce the occurrence of diseases and insect pests.

[0045] 6. The present invention can completely change the traditional backpack spraying method of rice field weeding. It is a product of the times that conforms to the current rural land management mode change, the large-scale transfer of rural labor force, and the increasing attention paid to the value of labor. Directly throwing in the field without mixing with soil or spraying greatly liberates the labor force and makes the heavy rice field weeding work easy and simple.

[0046] 7. The granules of the rice field herbicide composition of the present invention can be used for drone application, realizing the simple, efficient and accurate use of the integrated medicine and fertilizer, avoiding the drift of the medicine, being safe for rice, and greatly reducing the labor cost.

[0047] 8. Compared with conventional agents, the paddy field herbicide composition of the present invention not only has a higher prevention effect, but also has a significant yield-increasing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a process flow chart for preparing the extruded granules of the parent drug in Example 1.

[0049] Figure 2 This is a process flow chart for preparing seaweed essence extruded particles of Example 1.

[0050] Figure 3 This is a process flow chart for preparing the 0.11% benzylsulfuron-methyl-clomazone-pretilachlor herbicide composition granules for rice fields of Example 1. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Example 1

[0053] This embodiment provides a 0.11% benzylsulfuron-methyl-clomazone-pretilachlor herbicide composition granules for rice fields, and its material formula is as follows in terms of weight percentage:

[0054] 0.008% bensulfuron-methyl, 0.022% clomazone, 0.08% pretilachlor, 0.02% fenthiocarb, 0.56% white carbon, 26.0% diammonium phosphate, 20.5% potassium chloride, 16.1% urea, 0.12% seaweed extract, 0.4% zinc sulfate, 2% ammonium sulfate, and ammonium chloride is supplemented to 100% (i.e., 34.19% ammonium chloride). The sum of the weight percentages of bensulfuron-methyl, clomazone and pretilachlor in the granules of the rice field herbicide composition is 0.11%.

[0055] This embodiment also provides a method for preparing a 0.11% benzylsulfuron-methyl-clomazone-pretilachlor herbicide composition granule for rice fields, comprising the following preparation steps:

[0056] (1) Preparation of mother powder: The weighed benzylsulfuron-methyl (unless otherwise specified, the weighed amount is the same as in Example 1), clomazone, pretilachlor, fenthiocarb and white carbon are air flow-milled together and stirred to obtain a mother powder.

[0057] (2) Preparation of mother drug extruded granules: weighed mother powder, ammonium sulfate and 24.42% ammonium chloride are put into a disc mixer and mixed for 5 minutes, then crushed into powder by a chain mill, pre-screened, and the qualified materials are humidified and stirred in a double-shaft mixer, and then enter the extrusion granulator for granulation (the materials that fail the pre-screening are transferred to the disc mixer, and the above process cycle is executed). The granulated materials enter the primary screening, and the qualified materials enter the dryer for drying (the materials that fail the primary screening are transferred to the pre-screening through the fine return scraper, and the above process cycle is executed). The dried materials enter the cooler for cooling, and the cooled materials enter the fine screening again. The qualified materials enter the coating machine for coating (the materials that fail the fine screening are transferred to the pre-screening through the fine screening return scraper, and the above process cycle is executed), and the mother drug extruded granules are obtained (the process flow chart of this step is shown in the figure). Figure 1 shown).

[0058] (3) Preparation of seaweed essence extruded granules: weighed seaweed essence and 9.77% ammonium chloride are put into a disc mixer and mixed for 5 minutes, then crushed into powder by a chain mill, pre-screened, and the qualified materials are humidified and stirred in a double-shaft mixer, and then sent to an extrusion granulator for granulation (the materials that fail the pre-screening are transferred to the disc mixer, and the above process cycle is executed). The granulated materials enter the primary screening, and the qualified materials enter the dryer for drying (the materials that fail the primary screening are transferred to the pre-screening through a fine return scraper, and the above process cycle is executed). The dried materials enter the cooler for cooling, and the cooled materials enter the fine screening again. The qualified materials enter the coating machine for coating (the materials that fail the fine screening are transferred to the pre-screening through a fine screening return scraper, and the above process cycle is executed), and the seaweed essence extruded granules are obtained (the process flow chart of this step is shown in the figure). Figure 2 shown).

[0059] (4) Preparation of 0.11% benzylsulfuron-methyl-isothiazolin-pretilachlor herbicide granules for rice fields: Weighed mother drug extruded granules, seaweed extract extruded granules, diammonium phosphate, urea, potassium chloride, and zinc sulfate are respectively mixed in a drum through a batching belt. After sampling and testing, they are weighed, heat-sealed, sewn, stacked, and stored. (The process flow chart of this step is shown in the figure) Figure 3 shown).

[0060] Field experiment results

[0061] 1) Application method

[0062] Spread the pesticide evenly 2 days before rice sowing, after land preparation and before field leveling. Keep a 1-2 cm water layer in the field when applying the pesticide, and drain or dry naturally 1-2 days after applying the pesticide. Manual weeding is carried out 15 days and 25 days after applying the pesticide, for a total of 2 times.

[0063] The 0.11% benzsulfuron-methyl·clomazone·pretilachlor rice field herbicide composition granules of Example 1 (hereinafter referred to as 0.11% benzsulfuron-methyl·clomazone·pretilachlor granules) and 0.3% benzsulfuron-methyl·pretilachlor granules were accurately measured for each treatment area, and the weighed agents were put into self-sealing bags and taken to the field for direct and even application.

[0064] The control group treated with 32% benzylsulfuron-methyl wettable powder, 38% benzylsulfuron-methyl·isothiazolin·pretilachlor wettable powder and 5% pretilachlor·pentachlor granules were applied by soil method: Use an electronic balance to weigh the required pesticide for the plot and place it in a sealed bottle. When applying the pesticide, mix the sample in the sealed bottle with an appropriate amount of fine moist soil to make 20 kg / mu of medicated soil, i.e. 600 g of medicated soil per plot. Put it into a self-sealing bag and take it to the field for evenly spreading.

[0065] Soil spraying of the control agent 480 g / L clomazone EC and 30% pretilachlor EC treatment group: water consumption was 600 L / hm 2 , each cell (20m 2 ) The theoretical water consumption is 1.200L, and the actual water consumption is 1.320L. Accurately measure the amount of medicine used in each treatment area (the actual weighed amount is 10% more than the theoretical amount), put it in a plastic centrifuge tube and bring it to the field. When preparing the liquid medicine, first measure 1.320L of water, add 1 / 4 to 1 / 2 of the spray liquid amount of clean water to the rinsed sprayer, use the secondary dilution method, first add an appropriate amount of water to the beaker, then pour the medicine into the beaker and stir evenly, then transfer it to the sprayer, and finally add the remaining water and mix it thoroughly. Among them, the liquid medicine in the plastic centrifuge tube and the beaker must be rinsed at least 3 times during the transfer process to ensure that all the weighed medicine is transferred to the sprayer. Spray the soil evenly.

[0066] 2) Survey Results

[0067] The DPS analysis software was used to perform variance analysis on the control effect results of each treatment using Duncan's new multiple range method (DMRT).

[0068] Refer to "Guidelines for Field Efficacy Tests of Pesticides (I)" GB / T 17980.40-2000 Part 40: Herbicides for Control of Weeds in Rice Fields. The control efficiency calculation method is as follows:

[0069]

[0070] Table 1 Field efficacy test 1 (Qingyuan, Guangdong)

[0071]

[0072] Note: Rice variety: 19-spice rice; Main weeds: Echinochloa crus-galli (L.) P.Beauv., Ludwigia prostrata Roxb., Lindernia procumbens (Krock.) Borbás, Cyperusiria L. Control agents: 32% benzsulfuron-methyl wettable powder (Jiangsu Kuaida Agrochemical Co., Ltd., registration number PD20083816, the active ingredient is benzsulfuron-methyl), 480 g / L clomazone emulsifiable concentrate (Shandong Aokun Crop Science Co., Ltd., registration number PD20142413, the active ingredient is clomazone), 30% pretilachlor emulsifiable concentrate (Hefei Xingyu Chemical Co., Ltd., registration number PD20110065, the active ingredient is pretilachlor), 38% benzsulfuron-methyl·clomazone·pretilachlor wettable powder (Zhejiang Tianyi Biotechnology Co., Ltd., registration number PD20095392, the active ingredients are benzsulfuron-methyl, clomazone and pretilachlor), 5% pretilachlor·pentachlor granules (Jiangsu Laike Chemical Co., Ltd., registration number PD20210069, the active ingredients are pretilachlor and penoxsulam).

[0073] Table 2 Field efficacy test 2 (Jining, Shandong)

[0074]

[0075] Note: Rice variety: Luhuaxiang No. 1; Main weeds: Echinochloa crusgalli, Leptochloa chinensis, Eclipta prostrata, Cyperus difformis. There are also a small amount of dwarf arrowhead and flat-stemmed sedge. Control agents: 32% benzsulfuron-methyl wettable powder (Jiangsu Kuaida Agrochemical Co., Ltd., registration number PD20083816, the active ingredient is benzsulfuron-methyl), 480 g / L clomazone emulsifiable concentrate (Hotan Chemical Co., Ltd., Shenyang, Liaoning Province, registration number PD20200637, the active ingredient is clomazone), 30% pretilachlor emulsifiable concentrate (Jiangsu Huanong Biochemical Co., Ltd., registration number PD20080354, the active ingredient is pretilachlor), 0.3% benzsulfuron-methyl·pretilachlor granules (Guangdong Zhongxun Agricultural Science Co., Ltd., registration number PD20131264, the active ingredients are benzsulfuron-methyl and pretilachlor).

[0076] It can be seen from Tables 1-2 that the 0.11% benzylsulfuron-methyl·clomazone·pretilachlor granules of the present invention (that is, the 0.11% benzylsulfuron-methyl·clomazone·pretilachlor rice field herbicide composition granules of Example 1) are significantly superior to other control agents in terms of plant control effect (such as plant control effect 15 days after application, plant control effect 30 days after application, and plant control effect 40 days after application) and fresh weight control effect (such as fresh weight control effect 30 days after application, and fresh weight control effect 40 days after application), as well as in terms of yield increasing effect. Moreover, the plant control effect, fresh weight control effect and yield increase effect of the 0.11% benzylsulfuron-methyl·isothiazolin·pretilachlor granules of the present invention are gradually improved with the increase of the dosage of the active ingredient of the agent (the dosage of the active ingredient increases from 412.5 g / hectare to 577.5 g / hectare); among them, the dosage of the active ingredient of the agent of 577.5 g / hectare has reached the maximum dosage allowed for registration and setting by the Ministry of Agriculture and Rural Affairs, so no further tests were conducted on the dosage of the active ingredient of the agent.

[0077] Effect of field aerial spraying experiment

[0078] 1) Application method

[0079] 0.11% benzsulfuron-methyl·clomazone·pretilachlor granules (i.e., 0.11% benzsulfuron-methyl·clomazone·pretilachlor rice field herbicide composition granules of Example 1) were spread as base fertilizer using a plant protection drone DJIT60 before land preparation and field leveling, and rice was directly sown after field leveling. A control agent, 40% benzsulfuron-methyl·pretilachlor dispersible oil suspension mixed fertilizer, was manually spread as base fertilizer before land preparation and field leveling, and rice was directly sown after field leveling.

[0080] 2) Calculation method of drug efficacy

[0081]

[0082] In the formula: PT---the number of remaining grasses in the treatment area (or fresh weight); CK---the number of living grasses in the blank control area (or fresh weight)

[0083] 0.11% benzylsulfuron-methyl·clomazone·pretilachlor granules were used as basal fertilizer before land preparation and leveling. The total weed control effect on direct-seeded fields was 84.5% and 91.6% respectively 40 days after application. The total weed control effect of 0.11% benzylsulfuron-methyl·clomazone·pretilachlor granules 30kg was 25% higher than that of the control agent 40% benzylsulfuron-methyl·pretilachlor dispersible oil suspension 80g / mu (Table 3). After application, the rice grew well, with normal plant height and leaf color, and no symptoms of pesticide damage appeared. The number of rice stem tillers was investigated 40 days after application. The number of 0.11% benzylsulfuron-methyl·clomazone·pretilachlor granules 30kg per mu increased by 13.6% compared with the control agent 40% benzylsulfuron-methyl·pretilachlor dispersible oil suspension 40%.

[0084] Table 3 Results of the demonstration test of 0.11% benzylsulfuron-methyl-clomazone-pretilachlor granules for controlling weeds in direct-seeded fields by drone (40 days after application)

[0085]

[0086] Note: Rice variety: Wuyoudizhang; 40% benzsulfuron-methyl·pretilachlor dispersible oil suspension concentrate (active ingredients are benzsulfuron-methyl and pretilachlor), registration number PD20190155, produced by Hunan Xunchao Agrochemical Co., Ltd.

[0087] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0088] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A rice field herbicide composition, characterized in that: The material formula is as follows by weight percentage: The safener is fenthiocarb, cloquintocet-mexyl or isoxadiazole; The carrier is a mixture of one or more of kaolin, diatomaceous earth, pearl clay, quartz sand, stone powder and white carbon black; The fertilizer is a mixture of multiple types of potassium dihydrogen phosphate, potassium chloride, potassium sulfate, potassium nitrate, urea, ammonium chloride, ammonium sulfate, monoammonium phosphate, diammonium phosphate, sodium molybdate, ammonium molybdate tetrahydrate, zinc sulfate, manganese sulfate, copper sulfate, seaweed essence, and silicon fertilizer.

2. A rice field herbicide composition according to claim 1, characterized in that: The weight percentages of benzylsulfuron-methyl, clomazone and pretilachlor in the rice field herbicide composition are 0.001%-0.01%, 0.01%-0.05% and 0.05-0.1% respectively.

3. A rice field herbicide composition according to claim 1, characterized in that: The safener is fenchlorpyrifos, and the weight percentage of fenchlorpyrifos in the rice field herbicide composition is 0.01%-0.1%.

4. A rice field herbicide composition according to claim 1, characterized in that: The weight percentage of the carrier in the paddy field herbicide composition is 0.1-3%; the carrier is kaolin and / or white carbon black.

5. A rice field herbicide composition according to claim 1, characterized in that: The fertilizer is a mixture of diammonium phosphate, urea, potassium chloride, ammonium sulfate, ammonium chloride, zinc sulfate and seaweed extract; The percentage of the fertilizer in the total weight of the paddy field herbicide composition is as follows:

6. A rice field herbicide composition according to claim 5, characterized in that: The percentage of the fertilizer in the total weight of the paddy field herbicide composition is:

7. A rice field herbicide composition according to any one of claims 1 to 6, characterized in that: The material formula is as follows by weight percentage:

8. The use of a rice field herbicide composition according to any one of claims 1 to 7, characterized in that: The rice field herbicide composition is used for preventing and controlling weeds in rice nursery fields, direct-seeding rice fields, machine-transplanted rice fields, broadcast-cast rice fields, and transplanted rice fields.

9. The use of a rice field herbicide composition according to claim 8, characterized in that: The product formulation of the rice field herbicide composition is a granule; the granules of the rice field herbicide composition are used to control annual weeds in direct-seeded rice fields; The application method of the rice field herbicide composition granules is: spreading the rice field herbicide composition granules manually, spreading them with a spreading machine, mechanically spreading them in the air using a drone, or manually spreading them in the air using an agricultural aircraft.

10. The method for preparing a rice field herbicide composition according to any one of claims 1 to 7, characterized in that: The product dosage form of the rice field herbicide composition is a granule; the fertilizer is a mixture of diammonium phosphate, urea, potassium chloride, ammonium sulfate, ammonium chloride, zinc sulfate and seaweed extract; The preparation method of the rice field herbicide composition comprises the following preparation steps: (1) Preparation of mother powder: The weighed benzylsulfuron-methyl, clomazone, pretilachlor, safener and carrier are subjected to air flow grinding and stirred to obtain mother powder; (2) Preparation of mother drug extruded granules: The weighed mother powder, ammonium sulfate and part of ammonium chloride are mixed evenly, crushed into powder, pre-screened, the pre-screened qualified materials are humidified and stirred, and then extruded and granulated. The granulated materials enter the primary screening, the qualified materials of the primary screening are dried, cooled, finely screened, and the qualified materials of the fine screening are coated to obtain mother drug extruded granules; (3) Preparation of seaweed extract extruded granules: The weighed seaweed extract and the remaining ammonium chloride are uniformly mixed, crushed into powder, pre-screened, the pre-screened qualified materials are humidified and stirred, and then extruded and granulated. The granulated materials enter the primary screening, the qualified materials of the primary screening are dried, cooled, finely screened, and the qualified materials of the fine screening are coated to obtain seaweed extract extruded granules; (4) Preparation of granules of rice field herbicide composition: Weighed mother drug extruded granules, seaweed extract extruded granules, diammonium phosphate, urea, potassium chloride and zinc sulfate are mixed, and after screening, they are packaged and stored.

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