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: mefenacet, oxaziclomefone, pyrazosulfuron-ethyl, a carrier, a pigment and a specially selected fertilizer, the fertilizer is preferably a mixture of zinc sulfate, silicon fertilizer, urea, ammonium chloride and seaweed essence. The preparation method comprises the following steps: mixing and screening masterbatch extruded particles (prepared from mefenacet, oxaziclomefone, pyrazosulfuron-ethyl, pigment, carrier and ammonium chloride), seaweed extract extruded particles (prepared from seaweed extract and ammonium chloride), silicon fertilizer extruded particles (prepared from silicon fertilizer and ammonium chloride), urea and zinc sulfate to obtain a qualified product. The paddy field herbicide composition is applied once in rice production, has weeding and fertilizing effects, overcomes the defects of two or more times of herbicide and fertilizer application in the prior art, and is less in herbicide dosage, wider in herbicide controlling spectrum, better in control effect, capable of remarkably increasing the yield and more convenient to use.

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 mefenacet, oxazithromycin and pyrazosulfuron-methyl, a preparation method and an application thereof. Background Art

[0002] Mefenacet, chemical name 2-benzothiazol-2-yloxy-N-methylacetanilide, molecular formula C 16 H 14 N2O2S, CAS: 73250-68-7, is a cell growth and division inhibitor, mainly absorbed through the bud sheath and roots, and transmitted to the young shoots and leaves of weeds through the xylem and phloem, preventing the division and elongation of cells at the weed growth point. Mefenacet can effectively control grass weeds in rice fields, especially barnyard grass, and also has control effects on annual weeds and Cyperus difformis, felt, dwarf arrowhead, oriental water plantain, pondweed, firefly rush, and water sedge.

[0003] Pyrazosulfuron-ethyl, chemical name 5-(4,6-dimethoxypyrimidin-2-ylaminocarbonylaminosulfonyl)-1-methylpyrazole-4-carboxylic acid ethyl ester, molecular formula C 14 H 18 N6O7S, CAS: 93697-74-6, is a highly effective sulfonylurea selective systemic herbicide. It is absorbed by the roots and leaves of weeds and transferred to various parts of weeds. It inhibits the activity of acetolactate synthase, which blocks the synthesis of branched-chain amino acids, hinders the biosynthesis of amino acids, lysine, and isoleucine, and prevents cell division and growth, resulting in the obstruction of weed growth function and necrosis of weeds. Pyrazosulfuron-methyl is safe for rice; it is suitable for controlling broadleaf weeds (such as duckweed, duckweed, knotweed, and moss weeds) and sedge weeds (such as cowgrass, sedge, water sedge, and broken rice sedge) in rice fields. However, pyrazosulfuron-methyl has low activity in controlling barnyard grass in rice fields, and its single application cannot completely control grass, broadleaf, and sedge weeds in rice fields.

[0004] Oxaziclomefone, chemical name 3-[1-(3,5-dichlorophenyl)-1-methylethyl]-2,3-dihydro-6-methyl-5-phenyl-4H-1,3-oxazin-4-one, molecular formula C 20 H 19Cl2NO2, CAS: 153197-14-9, has a unique mechanism of action, affecting cell elongation and inhibiting the formation of gibberellic acid (GA3) in weeds; after application, the agent can be absorbed and conducted by the roots of plants, causing new roots and leaves to stop growing, followed by yellowing of stems and leaves, and weeds to die. Oxaziclome is mainly used to control annual grass weeds, sedges and some broadleaf weeds in rice fields, including: Cyperus dimorphus, Echinochloa oryzae, Echinochloa crus-galli, Leptochloa chinensis, Chickweed, Cow's hair felt, Moshangcai, Duck tongue grass and Knotweed.

[0005] A single herbicide is not only easy to develop drug resistance, but also requires a lot of medicine, has large residues, and is costly. Moreover, with the use of mefenacet, oxazithromycin, pyrazosulfuron-methyl, etc. for many years, some weeds have developed strong resistance, and their control effect is not as good as before, which seriously affects the yield of rice. Therefore, Publication No. CN117882733A provides a ternary mefenacet water dispersible granule, which expands the weed control range and improves the weed control efficiency through the compounding of the three active ingredients of mefenacet, pyrazosulfuron-methyl and oxazithromycin.

[0006] However, in traditional agricultural production technology, weeding and topdressing of rice fields are usually separated, which increases the labor intensity and number of labors of farmers. The existing ternary mefenacet water dispersible granules not only have a large amount of active ingredients, but also have the defects of a small weed control spectrum, poor weed control effect, and basically no effect on improving rice yield, and it is also impossible to achieve weeding and fertilization simultaneously. There is no report on the combination of mefenacet, oxazithromycin, pyrazosulfuron-methyl, carrier, pigment and specific fertilizer to form a new rice field herbicide composition and its preparation method and application. Summary of the invention

[0007] The object of the present invention is to overcome the deficiencies of the prior art, provide a rice field herbicide composition and a preparation method and application thereof, and specifically provide a rice field herbicide fertilizer granule containing mefenacet, oxazithromycin, and pyrazosulfuron-methyl and a preparation method and application thereof. The rice field herbicide composition scientifically combines mefenacet, oxazithromycin, pyrazosulfuron-methyl, a carrier, a pigment and a specific fertilizer, has good stability, better weed control effect and better rice harvest. Users can prevent and control rice field weeds and apply topdressing in agricultural production once, 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; and the ratio of mefenacet, oxazithromycin, pyrazosulfuron-methyl, a carrier, a pigment and a fertilizer in the rice field herbicide composition is scientific, which not only further expands the weed control spectrum, but also has a better overall weed control effect. The preparation method of the rice field herbicide composition is simple in process and low in production cost.

[0008] Based on this, the present invention discloses a rice field herbicide composition, and its material formula is as follows by weight percentage:

[0009]

[0010] Fertilizer replenishment to 100%;

[0011] The carrier is a mixture of one or more of kaolin, diatomaceous earth, pearl clay, quartz sand, stone powder and white carbon black;

[0012] The pigment is malachite green, rose essence or water-based red;

[0013] 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, silicon fertilizer, and seaweed essence.

[0014] Furthermore, the weight percentages of mefenacet, oxazithromycin and pyrazosulfuron-methyl in the rice field herbicide composition are preferably 0.1%-0.5%, 0.01%-0.05% and 0.01-0.05%, respectively.

[0015] Furthermore, the carrier is preferably kaolin and / or white carbon black; the weight percentage of the carrier in the rice field herbicide composition is preferably 0.1-3%.

[0016] Furthermore, the pigment is preferably malachite green or water red, and the weight percentage of the pigment in the rice field herbicide composition is preferably 0.005%-0.05%.

[0017] Furthermore, the fertilizer is preferably a mixture of zinc sulfate, silicon fertilizer, urea, ammonium chloride and seaweed extract; the percentage of the fertilizer in the total weight of the rice field herbicide composition is as follows:

[0018]

[0019] Furthermore, the percentage of the fertilizer to the total weight of the paddy field herbicide composition is preferably:

[0020]

[0021] Most preferably, the present invention provides a rice field herbicide composition, the material formula of which is as follows by weight percentage:

[0022]

[0023]

[0024] Among them, the total weight percentage of the three herbicide active ingredients, mefenacet, oxazithromycin and pyrazosulfuron-methyl, in the rice field herbicide composition is 0.28%.

[0025] The present invention also provides an application of a rice field herbicide composition, which is used to control weeds in direct-seeding rice fields, rice transplanting fields, machine-transplanted rice fields, and rice seedling-casting fields (such as barnyard grass, Leptochloa chinensis, dwarf arrowhead, wild arrowhead, water bamboo leaves, oriental water chestnuts, knotweed, duckweed, four-leaf duckweed, pondweed, moss, Polygonum syringae, Cyperus difformis, water sedge (triangular grass), felt, firefly rush, and other annual and some perennial weeds).

[0026] Furthermore, the product dosage form of the rice field herbicide composition is a granule; the granules of the rice field herbicide composition are used to control weeds in direct-seeded rice fields, rice transplanted fields, rice machine-transplanted fields, and rice seedling-casting fields, especially for controlling annual weeds in transplanted rice fields (such as barnyard grass, Leptochloa chinensis, dwarf arrowhead, wild arrowhead, water bamboo leaves, Alisma orientalis, knotweed, duckweed, grass tongue, grass grass, four-leaf duckweed, pondweed, moss, Polygonum syringae, Cyperus difformis, water sedge (three-angled grass), felt, firefly rush and other annual and some perennial weeds).

[0027] Furthermore, the rice field herbicide composition granules are spread manually, spread by a spreading machine, mechanically spread in the air by a drone, or spread manually in the air by an agricultural aircraft.

[0028] 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 zinc sulfate, silicon fertilizer, urea, ammonium chloride and seaweed extract;

[0029] The preparation method of the rice field herbicide composition comprises the following preparation steps:

[0030] (1) Preparation of mother powder: The weighed mefenacet, oxazithromycin, pyrazosulfuron-methyl, pigment and carrier are subjected to air flow grinding and stirred to obtain mother powder;

[0031] (2) Preparation of mother drug extruded granules: The weighed mother powder 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 of the pre-screening 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 of the primary screening 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 of the fine screening 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;

[0032] (3) Preparation of seaweed extract extruded particles: weighed seaweed extract and part of 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 is repeated); the granulated materials are sent to the primary screening, and the qualified materials are sent to the drying machine for drying (the materials that fail the primary screening are transferred to the pre-screening by a fine return scraper, and the above process is repeated); the dried materials are sent to the cooling machine for cooling, and the cooled materials are sent to the fine screening again, and the qualified materials are sent to the coating machine for coating (the materials that fail the fine screening are transferred to the pre-screening by a fine screening return scraper, and the above process is repeated), to obtain seaweed extract extruded particles;

[0033] (4) Preparation of silicon fertilizer extruded particles: The weighed silicon fertilizer and the remaining ammonium chloride are put into a disc mixer for mixing, and then crushed into powder by a chain mill. After pre-screening, the qualified materials of the pre-screening 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 of the primary screening 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 materials after cooling enter the fine screening again. The qualified materials of the fine screening 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), and the silicon fertilizer extruded particles are obtained;

[0034] (5) Preparation of 0.28% mefenacet-oxazithromycin-pyrazosulfuron-methyl rice field herbicide composition granules: weighed mother drug extruded granules, seaweed extract extruded granules, silicon fertilizer extruded granules, urea and zinc sulfate are respectively passed through a batching belt into a drum screen for mixing and screening; the qualified materials are sampled and tested, then measured on a packaging scale, heat-sealed, sewn and stacked (the unqualified materials are transferred to a disc mixer and re-granulated according to the extrusion granulation process) and put into storage.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] 1. The weed killing spectrum is wider and the weed killing effect is better. Since the action mechanisms of mefenacet, oxazithromycin and pyrazosulfuron-methyl are different in weeds, the compounding of these three herbicides improves the weed killing effect; moreover, the three herbicides are matched with carriers, pigments and specially selected fertilizers in a scientific ratio, which can further improve the weed killing effect and expand the weed killing spectrum. Therefore, the paddy field herbicide composition of the present invention can effectively prevent and kill all kinds of weeds in paddy fields (including weeds of Gramineae, Broadleaf Family and Cyperaceae), overcomes the defects of mefenacet, oxazithromycin and pyrazosulfuron-methyl when used alone, solves most of the weed problems in paddy fields, and has both sealing and stem and leaf weeding effects.

[0037] 2. The paddy field herbicide composition of the present invention scientifically combines three herbicide active ingredients (mefenacet, oxazithromycin, and pyrazosulfuron-methyl) with carriers, pigments, and specially selected 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 topdressing in one application, thus avoiding the mixing and secondary application in the agricultural production process.

[0038] In actual use, most existing pesticides are often mixed with soil or sand, and then mixed with compound fertilizer (or urea). In 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 a distant place to get it, which brings great trouble to farmers. In reality, farmers often use (30-50 grams) of pesticides + 2 kilograms of dry soil to mix, and then mix it with 10-20 kilograms of fertilizer. This often makes it impossible to mix the pesticides and fertilizers evenly; some pesticides will react and decompose when mixed with fertilizers, which can easily cause pesticide damage, especially the consequences of herbicides are more serious. In addition, some pesticides are highly toxic, and farmers lack the necessary protection knowledge during the mixing process, and poisoning often occurs. Farmers' cognitive level is relatively low. In order to be simple, convenient and safe, they may even skip the step of adding soil and directly apply pesticides, which will cause pesticide waste, and the control effect is often not good, and even lead to a decrease in rice yields.

[0039] The paddy field herbicide composition of the present invention can not only make its weed control spectrum wider and the weed control effect better, but also reduce the input amount of herbicides, and avoid harm to farmers. Compared with the existing operation, especially the paddy field herbicide composition granules of the present invention, it is more convenient to use, without spraying or mixing with soil for spreading, and the granules can be directly spread into the paddy field, thereby improving production efficiency, effectively reducing labor intensity, saving labor costs and protecting 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.

[0040] 3. The granules of the rice field herbicide composition of the present invention have 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.).

[0041] 4. The formulation of the rice field herbicide composition granules of the present invention is economical and environmentally friendly, and the preparation method thereof is simple in process and low in production cost. The use of this formulation for agricultural production can save packaging materials and fillers for pesticides, and can also save repeated transportation of pesticides and fertilizers, which can save money for users. Many existing pesticide adjuvants are mostly xylene, stone powder, etc., which pollute the environment. The rice field herbicide composition granules of the present invention do not need to introduce other adjuvants such as dispersants, wetting agents, organic solvents, surfactants, etc., and the pollution to the environment is greatly reduced.

[0042] 5. The paddy field herbicide composition of the present invention is based on the fertilizer requirement of rice growth and development. The best time to apply rice herbicides and fertilizers is after the rice is transplanted and green and the seedlings are established. Supplementing nitrogen fertilizer is beneficial to the rapid absorption of nutrients by rice. A variety of specially selected fertilizers such as zinc sulfate and seaweed extract are added 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.

[0043] 6. This invention completely changes the traditional backpack spraying method for rice field weeding. It is a product of the times that conforms to the current changes in rural land management methods, the large-scale transfer of rural labor, and the increasing emphasis on the value of labor. Directly spreading in the field without mixing with soil or spraying greatly liberates the labor force and makes the heavy work of rice field weeding easy and simple.

[0044] 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.

[0045] 8. Compared with conventional agents, the rice field herbicide composition of the present invention not only has a higher prevention effect, but also has a significant yield-increasing effect.

[0046] 9. The paddy field herbicide composition of the present invention is colored with pigments, which, on the one hand, has a certain warning effect to prevent accidental contact and ingestion, etc., and on the other hand, can be distinguished from other products on the market and has significant marking properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 This is a process flow chart for preparing the extruded granules of the parent drug in Example 1.

[0048] Figure 2 This is a process flow chart for preparing seaweed essence extruded particles or silicon fertilizer extruded particles of Example 1.

[0049] Figure 3 This is a process flow chart for preparing 0.28% mefenacet-oxazithromycin-pyrazosulfuron-methyl rice field herbicide composition granules of Example 1. DETAILED DESCRIPTION

[0050] 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.

[0051] Example 1

[0052] The present embodiment is a 0.28% mefenacet-oxazithromycin-pyrazosulfuron-methyl paddy field herbicide composition granules, and its material formula is as follows by weight percentage:

[0053] Mefenacet 0.24%, pyrazosulfuron 0.02%, oxazithromycin 0.02%, kaolin 0.56%, water red 0.01%, zinc sulfate 0.4%, seaweed essence 0.3%, silicon fertilizer 0.6%, urea 30%, ammonium chloride supplemented to 100% (i.e. ammonium chloride 67.85%). Among them, the sum of the weight percentages of the three herbicide active ingredients, mefenacet, oxazithromycin and pyrazosulfuron, in the rice field herbicide composition granules is 0.28%.

[0054] This embodiment also provides a method for preparing a 0.28% mefenacet-oxazithromycin-pyrazosulfuron-methyl rice field herbicide composition granules, comprising the following preparation steps:

[0055] (1) Preparation of mother powder: The weighed mefenacet (unless otherwise specified, the weighed amounts are the same as those in Example 1), oxazithromycin, pyrazosulfuron-methyl, water red and kaolin are air flow-milled and stirred to obtain a mother powder.

[0056] (2) Preparation of mother drug extruded granules: The weighed mother powder and 23.47% 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 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).

[0057] (3) Preparation of seaweed essence extruded granules: weighed seaweed essence and 15.51% 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 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 seaweed essence extruded granules are obtained (the process flow chart of this step is shown in the figure). Figure 2 shown).

[0058] (4) Preparation of silicon fertilizer extruded granules: The weighed silicon fertilizer and the remaining ammonium chloride (i.e., 28.87% 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 materials enter the fine screening after cooling. 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 silicon fertilizer extruded granules are obtained (the process flow chart of this step is shown in the figure). Figure 2 shown).

[0059] (5) Preparation of 0.28% mefenacet·oxazithromycin·pyrazosulfuron-methyl rice field herbicide composition granules: The weighed mother drug extruded granules, seaweed extract extruded granules, silicon fertilizer extruded granules, urea, and zinc sulfate are respectively passed through the batching belt into the drum screen for blending and screening. The qualified materials are sampled and tested, and then weighed by the packaging scale, heat-sealed, sewn, stacked (the unqualified materials are transferred to the disc mixer and re-granulated according to the extrusion granulation process), and stored (the process flow chart of this step is as shown in the figure). Figure 3 shown).

[0060] Field experiment results

[0061] 1) Application method

[0062] The pesticide treatment was carried out 7 days after rice transplanting.

[0063] The 0.28% mefenacet-oxazithromycin-pyrazosulfuron-methyl rice field herbicide composition granules of Example 1 (hereinafter referred to as 0.28% mefenacet-oxazithromycin-pyrazosulfuron-methyl granules) and 6% benzylsulfuron-methyl-pretilachlor-oxadiazine 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] 50% mefenacet wettable powder, 20% pyrazosulfuron-methyl wettable powder and 68% pyrazosulfuron-methyl / mefenacet wettable powder were applied using the soil method: add 100 ml of water to each agent in the plot, shake well and mix with part of the dry fine soil, then mix with the remaining soil and spread it. The mixing amount is 25 kg / mu.

[0065] 10% oxazithromycin suspension is sprayed evenly with water, with a water consumption of 450 liters per hectare.

[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 spices; Main weeds: Annual weeds: Echinochloa crus galli (L.) P. Beauv., Echinochloa crus galli (L.) P. Beauv., Echinochloa crus galli (L.) P. Beauv., Echinochloa crus galli (L.) P. Beauv., Echinochloa crus galli (L.) P. Beauv., is in the 2-3 leaf stage, with a coverage of 38%; Cyperus difformis L., Cyperus difformis L., is in the 3-4 leaf stage, with a coverage of 34%; Ludwigia prostrata Roxb., Ludwigia prostrata Roxb., is in the 2-4 leaf stage, with a coverage of 28%. Control agents: 50% mefenacet wettable powder (Jiangsu Kuaida Agrochemical Co., Ltd., registration certificate number PD20070377, the active ingredient is mefenacet), 10% oxazithromycin suspension (Shandong Xianda Agrochemical Co., Ltd., registration certificate number PD20160313, the active ingredient is oxazithromycin), 20% pyrazosulfuron-methyl wettable powder (Lianyungang Liben Crop Technology Co., Ltd., registration certificate number PD20110166, the active ingredient is pyrazosulfuron-methyl), 68% pyrazosulfuron-methyl / mefenacet wettable powder (Jiangsu Kuaida Agrochemical Co., Ltd., registration certificate number PD20121303, the active ingredients are pyrazosulfuron-methyl and mefenacet).

[0073] Table 2 Field efficacy test 2 (Changsha, Hunan)

[0074]

[0075]

[0076] Note: Rice variety: Zhongjia Zao 7; Main weeds: Echinochloa crusgalli (L.) Beauv., Lindernia procumbens (Krock.) Philcox, Cyperus difformis L. In addition, there are small amounts of Ludwigia prostrata Roxb., Sagittaria pygmaea Miq., Leptochloachinensis (L.) Nees, Monochoria avalginalis (Burm. f.) Presl, Fimbristylismiliacea (L.) Vahl. Control agents: 50% mefenacet wettable powder (Jiangsu Kuaida Agrochemical Co., Ltd., registration number PD20070377, the active ingredient of which is mefenacet), 10% oxazithromycin suspension (Shandong Xianda Agrochemical Co., Ltd., registration number PD20160313, the active ingredient of which is oxazithromycin), 20% pyrazosulfuron-methyl wettable powder (Lianyungang Liben Crop Technology Co., Ltd., registration number PD20110166, the active ingredient of which is pyrazosulfuron-methyl), 6% benzylsulfuron-methyl·pretilachlor·oxadiazine granules (Zhejiang Tianfeng Bioscience Co., Ltd., registration number PD20182344, the active ingredients of which are benzylsulfuron-methyl, pretilachlor and oxadiazine).

[0077] From Table 1-2, it can be seen that the 0.28% mefenacet·oxaziclomefone·pyrazosulfuron-methyl rice field herbicide composition granules of the present invention (i.e., 0.28% mefenacet·oxaziclomefone·pyrazosulfuron-methyl granules) are significantly superior to other control agents in terms of plant control effect (such as total weed plant control effect 15 days after application, total weed plant control effect 30 days after application, weed plant control effect 40 days after application) and fresh weight control effect (such as total weed fresh weight control effect 30 days after application, weed fresh weight control effect 40 days after application), as well as yield increase effect. 0.28% mefenacet·oxaziclomefone·pyrazosulfuron-methyl granules are superior to manual weeding in terms of total weed plant control effect 30 days after application, weed plant control effect 40 days after application, and weed fresh weight control effect 40 days after application, achieving long-term weed control.

[0078] Moreover, the plant control effect, fresh weight control effect and yield increase effect of the 0.28% mefenacet·oxazithromycin·pyrazosulfuron-methyl 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 420 g / hectare to 630 g / hectare); among them, the dosage of the active ingredient of the agent of 630 g / hectare has reached the maximum dosage allowed by the Ministry of Agriculture and Rural Affairs, so no further tests were conducted on the dosage of the active ingredient of the agent.

[0079] Effect of field aerial spraying experiment

[0080] 1) Application method

[0081] 0.28% mefenacet·oxazithromycin·pyrazosulfuron granules (i.e., 0.28% mefenacet·oxazithromycin·pyrazosulfuron granules for rice fields in Example 1) were used as greening fertilizer after the machine-transplanted seedlings turned green, and were spread using the plant protection drone DJIT60. 26% pyrazosulfuron methyl·mefenacet large granules were mixed with the greening fertilizer for machine-transplanted seedlings and spread manually.

[0082] 2) Calculation method of drug efficacy

[0083]

[0084] 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)

[0085] 0.28% mefenacet·oxazithromycin·pyrazosulfuron granules were used as greening fertilizer after the seedlings turned green. 10kg and 12.5kg per mu were used once. The total weed control effect on machine-transplanted rice fields was 94.5% and 98.2% respectively 40 days after the application. When 0.28% mefenacet·oxazithromycin·pyrazosulfuron granules were used at 12.5kg / mu, the control effect was 20% higher than that of the control agent 26% pyrazosulfuron·mefenacet large granules at 100g / mu (Table 3). After each treatment dose, the rice grew well, the plant height and leaf color were normal, and no symptoms of pesticide damage appeared. The number of rice stem tillers was investigated 40 days after treatment, and the number increased by 11.7% with 0.28% mefenacet·oxazithromycin·pyrazosulfuron-methyl granules at 12.5 kg / mu compared with 26% pyrazosulfuron-methyl·mefenacet large granules at 100 g / mu.

[0086] Table 3 Results of the demonstration test of 0.28% mefenacet·oxazithromycin·pyrazosulfuron granules using drones to control weeds in rice transplanting fields (40 days after application)

[0087]

[0088] Note: Rice variety: Wuyoudizhang; 26% pyrazosulfuron-methyl·mefenacet large granules, registration number PD20140106, produced by Jiangsu Ruibang Agrochemical Co., Ltd., its active ingredients are pyrazosulfuron-methyl and mefenacet.

[0089] 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.

[0090] 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: Fertilizer replenishment to 100%; The carrier is a mixture of one or more of kaolin, diatomaceous earth, pearl clay, quartz sand, stone powder and white carbon black; The pigment is malachite green, rose essence or water-based red; 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, silicon fertilizer, and seaweed essence.

2. A rice field herbicide composition according to claim 1, characterized in that: The weight percentages of mefenacet, oxazithromycin and pyrazosulfuron-methyl in the rice field herbicide composition are preferably 0.1%-0.5%, 0.01%-0.05% and 0.01-0.05%, respectively.

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

4. A rice field herbicide composition according to claim 1, characterized in that: The pigment is preferably malachite green or water red, and the weight percentage of the pigment in the rice field herbicide composition is preferably 0.005%-0.05%.

5. A rice field herbicide composition according to claim 1, characterized in that: The fertilizer is preferably a mixture of zinc sulfate, silicon fertilizer, urea, ammonium chloride and seaweed extract; the percentage of the fertilizer to the total weight of the paddy field herbicide composition is as follows: Ammonium chloride was added to make up to 100%.

6. A rice field herbicide composition according to claim 5, characterized in that: The percentage of the fertilizer to the total weight of the paddy field herbicide composition is preferably: Ammonium chloride was added to make up to 100%.

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: Ammonium chloride was added to make up to 100%.

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 direct-seeding rice fields, rice transplanting fields, machine-transplanted rice fields, and rice seedling-casting fields.

9. The use of a rice field herbicide composition according to claim 8, characterized in that: The product dosage form of the rice field herbicide composition is a granule; the granule of the rice field herbicide composition is used to control weeds in rice transplanting fields and rice machine transplanting 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 zinc sulfate, silicon fertilizer, urea, ammonium chloride and seaweed extract; The preparation method of the rice field herbicide composition comprises the following preparation steps: (1) Preparation of mother powder: The weighed mefenacet, oxazithromycin, pyrazosulfuron-methyl, pigment 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 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: weighed seaweed extract 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, fine-screened, and the qualified materials of the fine-screening are coated to obtain seaweed extract extruded granules; (4) Preparation of silicon fertilizer extruded particles: The weighed silicon fertilizer and the remaining 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 silicon fertilizer extruded particles; (5) Preparation of granules of rice field herbicide composition: Weighed mother drug extruded granules, seaweed extract extruded granules, silicon fertilizer extruded granules, urea and zinc sulfate are mixed, and after screening, they are packaged and stored.

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