CN112155013A

CN112155013A - Paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl as well as preparation method and application thereof

Info

Publication number: CN112155013A
Application number: CN202011094214.1A
Authority: CN
Inventors: 韩小爽; 叶进刚
Original assignee: TIANJIN HIGHPOINT PLANT PROTECTION CO Ltd
Current assignee: TIANJIN HIGHPOINT PLANT PROTECTION CO Ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2021-01-01

Abstract

The invention relates to a paddy field granule containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl and a preparation method thereof. The granules comprise a phase A component: 70-95% of a particle carrier, and a phase B component: 0.1-30% of functional mother powder containing three active ingredients of cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, and C-phase components: 1-40% of film forming auxiliary agent, which comprises adhesive, inducer and warning color. The invention expands the weed control spectrum by mixing the three components, improves the weeding effect, has outstanding control effect on grassy weeds, cyperaceae weeds and broadleaf weeds, particularly has excellent control effect on the moleplant seeds, has the control effect obviously superior to the activity of each component when being applied independently, slows down the generation of weed resistance, has good safety on crops, accords with the safety requirement of pesticide preparations, and is a very good drug combination for controlling paddy field weeds. Meanwhile, the fertilizer is prepared into granules which can be independently broadcast and applied or be mixed with fertilizer to be broadcast and applied, so that time and labor are saved, the working efficiency is improved, and the labor is reduced.

Description

Paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl as well as preparation method and application thereof

Technical Field

The invention belongs to the technical field of agricultural chemistry, relates to a paddy field pesticide technology, and particularly relates to paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, and a preparation method and application thereof.

Background

Rice is one of the main grain crops in China, and weeding in rice fields is a great problem in production. The farmland weeds are complicated in phase and various in variety, and the application of chemical agents is one of the most effective chemical means for preventing and killing agricultural weeds. In recent years, resistance has been developed in many weeds due to the large area of individual use of some herbicide species. The single variety can not effectively solve the farmland weeds and all show the defects of a certain aspect. The use of new pesticides without cross-resistance to control agricultural weeds is a good solution. However, at present, tens of thousands of compounds need to be screened for developing a new pesticide, the cost for developing new components is high, and the development period is long, so that the development of a new formulation or the mixing of different pesticide varieties is one of the most effective and economic methods for preventing and controlling agricultural resistance diseases, insect pests and weeds. The reasonable formula is screened out by the pesticide components, so that the actual control effect can be effectively improved, the dosage is reduced, the cost is reduced, and the generation of the drug resistance of diseases, pests and weeds is delayed, thereby being an important means for agricultural comprehensive treatment. In addition, the granular formulation is used as a convenient formulation in the herbicide, can be simultaneously broadcast with the fertilizer, saves labor and time and improves the working efficiency.

Cyhalofop-butyl chemical name: (R) -butyl 2- [ 4-cyano-2-fluorophenoxy ] phenoxy ] propionate, CAS accession No.: 122008-85-9, formula: C20H20FNO4, having the structural formula:

is an aryloxy phenoxy propionic acid systemic conduction type herbicide newly developed by the Dow company in America and is the only variety with high safety to rice in aryloxy phenoxy carboxylic acid ester herbicides. However, it is only used for stem and leaf treatment, and is not effective in pretreatment of buds. After the cyhalofop-butyl is treated by stem leaves, cyhalofop-butyl can be absorbed by leaves and stems of weeds and is conducted to growing points and meristematic tissues, and the synthesis of fatty acid is inhibited by inhibiting acetyl coenzyme A carboxylase, so that the growth of the weeds is hindered. The recipient weeds stop growing within a few days, after which they die gradually in one to three weeks.

Metamifop (Metamifop) chemical name: (2R) -2- [4- [ (6-chloro-2-benzoxazolyl) ] phenoxy ] -N- (2-fluorobenzene) -N-methylpropanamide, CAS accession No.: 256412-89-2, molecular formula: C23H18ClFN2O4, structural formula:

is an aryloxyphenoxylate herbicide developed by Korea institute of chemical technology, and can inhibit acetyl coenzyme A carboxylase (ACCase) and promote synthesis of plant fatty acid. The acetyl coenzyme A carboxylase inhibitor is used for treating stems and leaves of the paddy field, and the drug is absorbed by the stems and leaves and is conducted to a growing point through vascular bundles, thereby achieving the weeding effect.

Pyrazosulfuron-ethyl, also known as oxathicin, chemical name: ethyl 5- (4, 6-dimethoxypyrimidinyl-2-aminocarboxam-anesulfonyl) -1-methylpyrazolyl-4-carboxylate, CAS accession No.: 93697-74-6 formula: C14H18N6O7S, having the formula:

the herbicide is a sulfonylurea selective systemic conduction type herbicide developed by Nippon Nissan chemical industry Co., Ltd, mainly exerts a weeding effect by inhibiting the growth of the stem and leaf part of weeds and the extension of the root part through the absorption of the root system and the inhibition of the activity of acetolactate synthase and the mitosis of cells. Pyrazosulfuron-ethyl can prevent and kill annual and perennial broadleaf weeds and sedge weeds. The pyrazosulfuron-ethyl has good water solubility, strong mobility in the environment, almost no influence on the growth of rice, stable pesticide effect and high safety.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, which change the traditional pesticide application mode, have the advantages of simple and convenient pesticide application, wide herbicide controlling spectrum, low toxicity and safety and resistance delay, and the preparation method and the application thereof.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

a paddy field granule containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, which comprises a phase A component, a phase B component and a phase C component, wherein:

the phase A component is a particle carrier and accounts for 70-95% of the mass percentage;

the phase B component is functional mother powder or mother liquor containing three active ingredients of cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, and accounts for 0.1-30% of the total mass of the granule;

the phase C component is a film-forming additive and accounts for 1-40% of the mass percent.

The granular carrier is one kind of granule prepared with quartz sand, river sand, clay shale, slate, red brick granule, attapulgite, organic bentonite, kaolin and white carbon black as main material and through crushing, sieving, pelletizing, and sintering, and has specific weight of 0.7-1.5g/cm³Spherical, ellipsoidal, cylindrical or irregular particles with a particle size ranging from 1 to 5 mm.

Moreover, the mass ratio of the cyhalofop-butyl to the metamifop to the pyrazosulfuron-ethyl is 0.01-10%: 0.1% -20%: 0.01 to 10 percent.

And the phase B component is mixed with functional additives, and the functional additives comprise one or more combinations of a binder, a water reducing agent, a dispersing agent, a wetting agent, an inducer and a warning color.

Moreover, the film forming auxiliary agent comprises a binder, an inducer and a warning color.

A preparation method of paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl comprises the following specific steps:

the method comprises the following steps: determining the particle type coefficient and the particle density of the particle carrier;

step two: preparing functional mother powder or functional mother liquor of the phase B component;

step three: for the process of preparing granules by selecting a mother powder dry method, preparing a C-phase film forming auxiliary agent: 1 to 10 percent of adhesive, 1 to 10 percent of inducer and 0.01 to 5 percent of warning color are taken according to the weight ratio and placed in a container with stirring and heating, slowly heated to 90 ℃ from normal temperature, and stirred to be homogeneous for standby; the mother liquor is directly used for preparing the selected mother liquor by a wet method for standby.

Step four: preparing a finished product, comprising the following steps of:

the method comprises the following steps: taking 70-95% of phase A carrier particles which accord with the screening data in the step one according to the weight ratio, placing the phase A carrier particles in a mixing coating machine, adding 1-40% of a film-forming auxiliary agent under the stirring state, continuously stirring until the film-forming auxiliary agent is uniformly wetted and distributed on the surfaces of the particles, adding 0.1-30% of functional mother powder until the mother powder forms a medicine film on the surfaces of the particles to obtain a wet material of a finished product, and placing the wet material in a rolling drying machine for drying to obtain a finished product of the coating-method granules;

the second method comprises the following steps: and (2) taking 70-95% of the A-phase carrier particles meeting the screening data in the step one according to the weight ratio, placing the A-phase carrier particles into a mixing coating machine, adding the mother solution required according to the content proportion of the effective ingredients of the drawn commodity under the stirring state, continuously stirring until the mother solution is wetted and distributed on the surfaces of the particles and a medicinal film is formed on the surfaces of the particles to obtain a finished wet material, and then placing the wet material into a rolling drying machine for drying to obtain a finished product of the coating-method granules.

Moreover, the method for preparing the functional mother powder comprises the following steps: firstly, mechanically crushing or air-jet crushing active ingredient raw medicine, then taking 5-90% of active ingredient raw medicine fine powder, 0.5-10% of binder, 0.5-10% of water reducing agent, 0.1-5% of dispersing agent and 0.1-5% of wetting agent according to weight ratio, placing the active ingredient raw medicine fine powder, the binder, the water reducing agent, the dispersing agent and the wetting agent in a gravity-free mixer for weightless mixing to obtain functional mother powder for later use.

Moreover, the method for preparing the functional mother liquor comprises the following steps: 5 to 60 percent of active ingredient raw medicine, 0.5 to 10 percent of binding agent, 0.5 to 10 percent of water reducing agent, 0.1 to 5 percent of dispersing agent, 1 to 10 percent of inducer and 0.01 to 5 percent of warning color are put into a sand mill for grinding to obtain functional mother liquor for later use.

An application of the granular herbicide containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl in the paddy field for preventing and eliminating the annual weeds in direct-seeding paddy field, rice seedling throwing paddy field and transplanted paddy field is disclosed.

The paddy field granules are used for weeding after seedlings of the paddy field, and objects to be prevented and removed comprise barnyard grass, moleplant seeds, goosegrass herb, felt, monochoria vaginalis, wild water chestnut, rhizoma pleionis, cyperus rotundus, carignane, ludwigia prostrata, eclipta alba, common andrographis herb, nupharia herb, amaranthus quadrifolius, amaranthus, sedum lineare and buddha linear.

The invention has the advantages and positive effects that:

1. the active ingredient of the pesticide contains three components of cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, the cyhalofop-butyl is suitable for preventing and killing annual gramineous weeds in transplanted paddy rice and direct-seeded paddy fields, has special effect on moleplant seeds and barnyard grass, is also efficient on the large-age barnyard grass, and simultaneously can prevent various gramineous weeds such as paspalum distichum, digitaria sanguinalis, green bristlegrass, goosegrass herb, aloesweed and the like. The application period of cyhalofop-butyl is long, and the cyhalofop-butyl can be used from the 1-2 leaf period of weeds to 60 days before rice is harvested; the degradation in rice and soil is rapid, and the rice and the succeeding crops are safe; the metamifop is suitable for preventing and killing various gramineous weeds such as crabgrass, barnyard grass, moleplant seeds and the like in transplanted and direct-seeded rice fields. Unlike most of the herbicides, metamifop is safe and low-toxic to rice and safe to environment; the sulfosulfuron can prevent and kill annual and perennial broadleaf weeds and cyperaceous weeds, such as heterotypic cyperus, cyperus esculentus, iris lactea, monochoria vaginalis, cress, Equisetum arvense, edible tulip, Eisenia indica, duckweed and eclipta prostrata. Has certain control effect on barnyard grass, but is poor, and has no effect on moleplant seed. Pyrazosulfuron-ethyl has good water solubility, strong mobility in the environment, almost no influence on the growth of rice, stable pesticide effect and high safety, but late rice varieties (japonica rice and glutinous rice) are relatively sensitive and are prevented from being applied at the late rice germination stage as much as possible, otherwise, phytotoxicity is easily generated.

2. The composite paddy field granules avoid the problems of single component resistance and single weeding, expand the weed control spectrum, prevent and kill gramineous, cyperaceous and broadleaf weeds in the paddy field by one-time application, reduce the application times, reduce the control cost, slow down the generation of weed resistance and have good safety to crops.

3. The granular carrier can be selected according to actual requirements, for example, the particle diameter and the bulk density (kg/m) of the granular carrier can be measured according to different varieties of fertilizers³) Selecting A phase carrier particles with similar appearance, determining that the carrier particles and the fertilizer are uniformly and stably mixed without floating, sinking and layering, and can be mixed with the fertilizer or directly thrown for use.

4. The use frequency and the use amount of the weeding granule can be adjusted according to the conditions of crops and weeds, and are not influenced by weather, for example, spraying agents generally require no rainfall before and after application, the granule has no problems, and the weeding granule is convenient to use.

5. The invention has the advantages of exquisite process, no phenomena of threshing, dust and the like of the prepared finished product particles, good fluidity, good film forming, good glossiness, good wear resistance, no sticking of particles and agglomeration and high safety. The traditional backpack type spraying mode for weeding the rice field can be efficiently and thoroughly changed, and small field blocks can be directly thrown on ridges without being put into the field; the field blocks can be mixed with fertilizers and broadcast together, so that the labor force is greatly liberated.

Detailed Description

The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.

The granular formulation comprises a phase A component, a phase B component and a phase C component, wherein the phase A component is a particle carrier, the phase B component is functional mother powder containing three pesticide active ingredients of cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, and the phase C component is a film forming auxiliary agent.

Phase A component: the particle carrier accounts for 70-95 percent of the mass percent, and the carrier is prepared by crushing and screening quartz sand, river sand, soil shale, slate, red brick particles, attapulgite, organic bentonite, kaolin, white carbon black and the like which are used as main raw materialsRespectively or grinding, granulating and sintering to obtain granules with specific gravity of 0.7-1.5g/cm³Spherical, ellipsoidal, cylindrical or irregular particles with a particle size ranging from 1 to 5 mm;

b phase component: the pesticide is functional mother powder containing three pesticide active ingredients of cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl, and the mass ratio of the cyhalofop-butyl, the metamifop and the pyrazosulfuron-ethyl is (0.01-10%): (0.1% -20%): (0.01% -10%); the total mass percentage content of the granules is 0.1-30%; the functional mother powder is solid crystalline or amorphous solid raw pesticide or raw pesticide which is converted from liquid state into solid state in an adsorption mode, and the high-content pesticide coated granule invented by one of the inventors of the invention and the pesticide functional mother powder prepared by the preparation method (application publication No. CN106417280A) thereof are applied. The active ingredients are mechanically crushed or ground and then mixed with a proper amount of functional auxiliaries, wherein the functional auxiliaries comprise various combinations of binders, water reducers, dispersants, wetting agents, inducers and warning colors and residual materials.

C phase component: the pesticide film-forming assistant is 1-40% by mass, is prepared by crushing or grinding a pesticide film-forming assistant (application publication No. CN106417286A) invented by one of the inventors into a liquid or solid mother medicine, and comprises a binder, an inducer and a warning color, wherein the percentage of each component is 1-10% of the binder, 1-20% of the inducer and 0.1-5% of the warning color, the binder is any one of carboxymethyl cellulose, polyvinyl alcohol or gelatin, the inducer is sucrose, and the warning color is any one of basic or acidic dye or other direct dye.

And mixing the phase B component and the phase C component to form the functional slurry.

The preparation method of the granules comprises the following specific steps:

the method comprises the following steps: determining the particle type coefficient and the particle density of the phase A component;

step two: the functional mother powder of the B phase component can be prepared by the following two methods:

the method comprises the following steps: firstly, mechanically crushing or air-jet crushing active ingredient raw medicine, and then taking 5-90% of active ingredient raw medicine fine powder according to the weight ratio; 0.5 to 10 percent of binder; 0.5 to 10 percent of water reducing agent; 0.1 to 5 percent of dispersant; 0.1-5% of wetting agent, and placing the wetting agent in a gravity-free mixer for weight loss mixing to obtain functional mother powder for later use;

the second method comprises the following steps: 5 to 60 percent of active ingredient raw medicine and 0.5 to 10 percent of binder; 0.5 to 10 percent of water reducing agent; 0.1 to 5 percent of dispersant; 1% -10% of an inducer; grinding 0.01-5% of the warning color in a sand mill to obtain a functional mother solution for later use;

step three: for the process of preparing (dry method preparation) granules by selecting mother powder, preparing the C-phase film forming auxiliary agent: 1-10% of binder is taken according to the weight ratio; 1% -10% of an inducer; placing 0.01-5% of warning color in a container with stirring and heating, slowly heating to 90 ℃ from normal temperature, and stirring to homogeneous phase for later use; the selected mother liquor (wet method) is directly used for preparation for standby.

Step four: preparing a finished product: can be prepared by the following two methods:

the method comprises the following steps: 70-95% of the A-phase carrier particles meeting the screening data of the step one are taken according to the weight ratio and placed in a mixing coating machine, 1-40% of film-forming auxiliary agent is added under the stirring state, the stirring is continued until the film-forming auxiliary agent is uniformly wetted and distributed on the surfaces of the particles, 0.1-30% of functional mother powder is added until the mother powder forms a medicine film on the surfaces of the particles, a finished wet material is obtained, and the wet material is placed in a rolling drying machine for drying, so that a finished product of the coating-method granules is obtained.

The percentage of each component in the C phase component is 1 to 10 percent of binder, 1 to 20 percent of inducer and 0.1 to 5 percent of warning color, the binder is any one of carboxymethyl cellulose, polyvinyl alcohol or gelatin, the inducer is cane sugar, and the warning color is any one of alkaline dye, acid dye or other direct dye.

The paddy field granules are applied to preventing and removing annual weeds in direct-seeding paddy fields, rice seedling fields, seedling throwing paddy fields and transplanted rice fields, the weeds comprise gramineae weeds, broadleaf weeds and cyperaceae weeds, and the prevention and removal objects comprise barnyard grass, moleplant seeds, goosegrass herb, felt, monochoria vaginalis, water chestnuts, rhizoma pleionis, cyperus, carignana, polygonum hydropiper, Equisetum arvense, Spirodela quadrifolia, amaranthus amabilis, monochoria sinensis and daylily.

Example 1

Preparation of 0.8% cyhalofop-butyl 0.5% metamifop 0.2% pyrazosulfuron granules:

the preparation of 20% functional mother liquor, the composition and preparation parameters are shown in table 1.

Table 1: each component and preparation parameter of functional mother liquor

0.8 percent of cyhalofop-butyl, 0.5 percent of metamifop and 0.2 percent of pyrazosulfuron-ethyl granules are prepared by firstly weighing the granules with the specific gravity of 1.0g/cm³9610g of a particle carrier with the particle size range of 3mm is placed in a mixer, and the mixer is started to enable the carrier to be in a stirring and mixing state; and putting the functional mother solution into a mixer, mixing for 10 minutes in a rolling way for coating and forming, and finally putting the film-forming wet material into a rolling dryer for drying to obtain 10.0kg of granules of 0.8 percent of cyhalofop-butyl, 0.5 percent of metamifop and 0.2 percent of pyrazosulfuron-ethyl.

Example 2

Preparation of 0.5% cyhalofop-butyl 0.5% metamifop 0.2% pyrazosulfuron granules:

the preparation of 30% functional mother liquor, the composition and preparation parameters are shown in table 2.

Table 2: each component and preparation parameter of functional mother liquor

0.5 percent of cyhalofop-butyl, 0.5 percent of metamifop and 0.2 percent of pyrazosulfuron-ethyl granules are firstly weighed and taken to have the specific gravity of 1.0g/cm³Putting 9810g of particle carriers with the particle size range of 2mm into a mixer, and starting the mixer to enable the carriers to be in a stirring and mixing state; and putting the functional mother solution into a mixer, mixing for 10 minutes in a rolling way for coating and forming, and finally putting the film-forming wet material into a rolling dryer for drying to obtain 10.0kg of granules of 0.5 percent of cyhalofop-butyl, 0.5 percent of metamifop and 0.2 percent of pyrazosulfuron-ethyl.

Example 3

Preparation of 1% cyhalofop-butyl 0.5% metamifop 0.2% pyrazosulfuron granules:

the preparation of 40% functional mother liquor, the composition and preparation parameters are shown in table 3.

Table 3: each component and preparation parameter of functional mother liquor

1 percent of cyhalofop-butyl, 0.5 percent of metamifop and 0.2 percent of pyrazosulfuron-ethyl granules are prepared by firstly weighing the granules with the specific gravity of 1.2g/cm³9750g of particle carriers with the particle size range of 4mm are placed in a mixer, and the mixer is started to ensure that the carriers are in a stirring and mixing state; and putting the functional mother solution into a mixer, mixing for 10 minutes in a rolling way for coating and forming, and finally putting the film-forming wet material into a rolling dryer for drying to obtain 10.0kg of 1% cyhalofop-butyl, 0.5% metamifop, 0.2% pyrazosulfuron-ethyl granules.

Example 4

Preparation of 0.8% cyhalofop-butyl 1% metamifop 0.2% pyrazosulfuron granules:

in the first step, 80% of functional mother powder is prepared, and the components and preparation parameters are shown in table 4.

Table 4: functional mother powder composition and preparation parameters

And a second step of preparing functional bonding slurry: the slurry composition and preparation parameters are shown in table 5.

Table 5: each component and preparation parameter of the functional bonding slurry

Functional bonding slurry	Binder	Induction agent	Alert color	Water (W)
					Special slurry for granules	50g	200g	20g	730g

Preparing a bonding slurry: putting the weighed raw materials into a container with stirring and heating functions, starting stirring, slowly heating to 90 ℃ from normal temperature, and stirring to be homogeneous for later use.

0.8 percent of cyhalofop-butyl, 1 percent of metamifop and 0.2 percent of pyrazosulfuron-ethyl granules are firstly weighed and takenIs 0.9g/cm³9600g of particle carriers with the particle size range of 4mm are placed in a mixer, and the mixer is started to ensure that the carriers are in a stirring and mixing state; weighing 300g of the bonding slurry prepared in the second step, and fully wetting the carrier in the mixer in a spraying mode; then 105g of the 85% cyhalofop-butyl prepared in the first step, 132g of 85% metamifop and 27g of 85% pyrazosulfuron-ethyl are weighed and put into a mixer to be subjected to rolling mixing for 10 minutes for coating and forming, and finally the film-forming wet material is put into a rolling dryer to be dried to obtain 9.7kg of 0.8% cyhalofop-butyl 1% metamifop 0.2% pyrazosulfuron-ethyl granules.

Biological examples:

field bioassay example: the field efficacy test of cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl granules for preventing and killing annual weeds in paddy fields.

The test is carried out in paddy fields with mixed and multiple weeds such as resistant barnyard grass, resistant moleplant, ludwigia prostrata, phyllostachys pubescens, alternanthera philoxeroides and the like. The preparation method comprises the steps of selecting 3 medicaments of examples 1-4 of the invention, 40% of cyhalofop-butyl dispersible oil suspension, 10% of metamifop emulsifiable concentrate and 10% of pyrazosulfuron-ethyl wettable powder, wherein the granule adopts a spraying application mode, and the other 3 medicaments adopt a conventional spraying application mode; the application time is 1 heart of 2 leaves of rice. And (5) surveying the weed condition by adopting a five-point sampling mode and 1 square meter of each point.

TABLE 6 herbicide control test for paddy field with metamifop, cyhalofop-butyl and pyrazosulfuron-ethyl granules

As can be seen from the field experiment results in Table 6, after the application of the rice for 8 days, the rice seedling-raising agent is safe to the rice under the condition of the test dosage, and abnormal phenomena such as dead seedlings, burnt seedlings, dry tips, withered spots, growth inhibition and the like do not occur. 30 days after the pesticide is applied, the control effect of the formula of the embodiment 1-4 of the invention on annual weeds such as barnyard grass, moleplant seed, ludwigia prostrata, phyllostachys pubescens, alternanthera philoxeroides and alternanthera philoxeroides is higher than 90 percent under the condition of experimental dosage, the control effect is obviously higher than that of each single agent, and the ternary combination plays a role in synergy. Therefore, the invention is safe to rice in a certain dosage range, has excellent weeding performance and has larger agricultural popularization value.

Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.

Claims

1. A paddy field granule containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl is characterized in that: the granule comprises a phase A component, a phase B component and a phase C component, wherein:

2. The paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl according to claim 1, characterized in that: the particle carrier is a particle formed by crushing, screening or grinding, granulating and sintering quartz sand, river sand, argillaceous shale, slate, red brick particles, attapulgite, organic bentonite, kaolin and white carbon black serving as main raw materials, and the specific gravity of the particle is 0.7-1.5g/cm³Spherical, ellipsoidal, cylindrical or irregular particles with a particle size ranging from 1 to 5 mm.

3. The paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl according to claim 1, characterized in that: the mass ratio of the cyhalofop-butyl to the metamifop to the pyrazosulfuron-ethyl is 0.01-10%: 0.1% -20%: 0.01 to 10 percent.

4. The paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl according to claim 1, characterized in that: and the phase B component is mixed with a functional auxiliary agent, and the functional auxiliary agent comprises one or more of a binder, a water reducing agent, a dispersing agent, a wetting agent, an inducer and a warning color.

5. The paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl according to claim 1, characterized in that: the film forming assistant comprises a binder, an inducer and a warning color.

6. A preparation method of paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl is characterized by comprising the following steps: the method comprises the following specific steps:

Step four: preparing a finished product, comprising the following steps of:

7. The method for preparing paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl according to claim 6, characterized in that: the preparation method of the functional mother powder comprises the following steps: firstly, mechanically crushing or air-jet crushing active ingredient raw medicine, then taking 5-90% of active ingredient raw medicine fine powder, 0.5-10% of binder, 0.5-10% of water reducing agent, 0.1-5% of dispersing agent and 0.1-5% of wetting agent according to weight ratio, placing the active ingredient raw medicine fine powder, the binder, the water reducing agent, the dispersing agent and the wetting agent in a gravity-free mixer for weightless mixing to obtain functional mother powder for later use.

8. The method for preparing paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl according to claim 6, characterized in that: the preparation method of the functional mother liquor comprises the following steps: 5 to 60 percent of active ingredient raw medicine, 0.5 to 10 percent of binding agent, 0.5 to 10 percent of water reducing agent, 0.1 to 5 percent of dispersing agent, 1 to 10 percent of inducer and 0.01 to 5 percent of warning color are put into a sand mill for grinding to obtain functional mother liquor for later use.

9. The application of the paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl is characterized in that: the paddy field granules are applied to preventing and killing annual weeds in direct-seeding paddy fields, rice seedling fields, seedling-throwing paddy fields and transplanted rice fields, wherein the weeds comprise gramineous weeds, broadleaf weeds and cyperaceae weeds.

10. The application of the paddy field granules containing cyhalofop-butyl, metamifop and pyrazosulfuron-ethyl is characterized in that: the paddy field granule is used for weeding after seedling in paddy field, and the control objects comprise barnyard grass, moleplant seed, goosegrass herb, felt, monochoria vaginalis, water chestnut, rhizoma pleionis, cyperus rotundus, carignane, ludwigia prostrata, herba arthrodii, Spirodela quadrifolia, amaranthus amansii, monochoria japonica and buddha niphonium baronii.