JPS62126102A - Granular herbicide composition for plowed field - Google Patents

Abstract

PURPOSE:To obtain the titled herbicide composition having excellent diffusibility into soil of plowed field, applicable without causing drifting and having stable herbicidal effect, by supporting a 2,6-dinitroaniline herbicide and a specific compound as active components on a granular carrier. CONSTITUTION:A 2,6-dinitroaniline herbicide such as pendimethalin, etc., and one or more kinds of the compounds of formula I (R1 is H or 1-4C lower alkyl; R2 is 1-6C lower alkyl or cyclohexyl) such as 3-dimethyldiphenyl or compound of formula II (R3 is 1-3C lower alkyl; n is 1 or 2) such as 2- methylnaphthalene are supported on a granular carrier containing >=95% particles having particle diameter of 180-710mum such as pumice. The objective granular agent is produced by subjecting the supported product to adsorptive impregnation process preferably by heating a solid agricultural chemical component at or above its melting point and impregnating the molten component into the granular carrier. EFFECT:The granular agent can be easily produced giving little color contamination of production apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a granular herbicide composition for field use containing a 2,6-dinitroaniline compound as an active ingredient. Therefore, the present invention is utilized in the industrial field of producing agricultural chemicals and in agriculture.

[Conventional technology]

Many 2.6-dinitroaniline compounds have herbicidal activity, such as α, α, α-trifluoro2.
6-sinitro N,N-dipropyl-P-)luidine (
trifluralin), 4-(methylsulfonyl)-2,6
-Sinitro N.

N-bropylaniline to toralin), N-(l-ethylpropyl)-3,4-dimethyl-2,6-dinitroaniline (pendimethalin), N-butyl-N-ethyl-α, α, α -Trifluoro2.6-SinitroP-
) Luizine (henfluralin), N,N-diethyl-2
゜6-dini)tff-4-)lifluoromethyl-m-7
Enylenediamine (dinitramine) etc. are already commercially available,
- It has a wide range of herbicidal effects from grass weeds to broad-leaved weeds, and is widely used every year. This type of herbicide generally has low solubility in water, is colored, and has strong soil adsorption properties, and is formulated as emulsions, wettable powders, and granules. It is used depending on the purpose.

There are many places in the upland fields where water access is inconvenient, and in such places, granules that do not require dilution water when spraying herbicides are particularly preferred.
Granules of 0-1700 μm, fine granules of 106-3004 μm, and m-granules F of 63-250 μm have already been put into practical use as agrochemical formulations, but in recent years, improvements have been made in their herbicidal effects as granular herbicides for field use. The development of a fine granule F having a particle size of 180 to 710 pm is particularly desired as one that satisfies both the above requirements and prevention of drift outside the weeding target area. In other words, unlike Water 111, when spraying on field soil with low moisture content, it is preferable to use a fine-grained formulation that covers the surface of the field soil as uniformly as possible in order to increase the herbicidal effect; In order to reduce the impact and uniformly spray the soil surface for the purpose of weeding, or to prevent drift outside the weeding target, a formulation with a coarse particle size is preferable, and a fine particle F of 180 to 710 μm is preferable as one that satisfies both of these requirements. devised. On the other hand, 1
Even if 20,000 grains per gram of fine granule F are evenly distributed at 3 kg per 10 ares (10 a), 1 cr of the field soil surface
There are only 6 grains per rI', generally 2.
If field soil treatment agents including 6-dinitroaniline herbicides do not form a uniform chemical treatment layer on the surface layer of field soil, control of weeds that germinate and grow will be insufficient. The physical phenomena that form a uniform chemical-treated layer are thought to include two cases: the active ingredient dissolves in the moisture present on the soil surface and diffuses between soil particles, and the other causes diffusion due to gasification of the active ingredient.

In the former case, it is necessary to take measures such as increasing the solubility of compounds with low water solubility, and in the latter case, prevention of volatilization is desired in order to provide residual weeding effect.

Methods for producing granules include (1) kneading extrusion method, (
2) Coating method, (3) Adsorption impregnation method, (4) Crushing method, (5)
There are spray granulation methods, (6) fluidized bed granulation methods, etc., and one of them is adopted in consideration of the thermal stability of the agricultural chemical active ingredient, the target particle size, and various effects on the manufacturing equipment, etc. . 1
As a method for obtaining granules of 80 to 710 Bm, there are generally the methods (2) to (6) above, among which the coating method,
The adsorption impregnation method has the advantage of being economically advantageous.

2.6-dinitroaniline herbicides are generally solid at room temperature, have extremely low solubility in water, and are strongly colored.To produce granules containing such strongly colored pesticide active ingredients, the following steps are required: In order to prevent product discoloration, it is necessary to adopt a manufacturing method that reduces the discoloration of the manufacturing equipment, or to install dedicated manufacturing equipment.From an economic point of view, the former is naturally more advantageous than the latter. As a manufacturing method, the adsorption impregnation method described in (3) above is advantageous from various points of view.

To produce a solid agricultural chemical active ingredient by the adsorption impregnation method, the solid agricultural chemical active ingredient is melted to a temperature higher than its inherent melting point and adsorbed onto a granular carrier, or the solid agricultural chemical active ingredient is dissolved in an appropriate solvent. One of two methods is adopted: adsorption and impregnation. Therefore, it is undesirable to color the manufacturing equipment2.
．． To obtain 6-dinitroaniline herbicide granules,
It is preferable to dissolve the herbicidal active ingredient in a solvent and adsorb and impregnate it onto a granular carrier.The solvent to be used must be volatile, irritating, and odor-free due to the safety and health of pesticide manufacturing workers and pesticide spraying workers, and the quality of the granular agent. It is necessary to use something neutral. Known solvents used in the same manufacturing method include:

For example, glycerin, ethylene glycol, propylene glycol, alkylene glycol alkyl ether,
Method using alkylene glycol dialkyl ether etc.
719, Japanese Patent Publication No. 48-12974, Japanese Patent Publication No. 80-5561~':g), etc. are known.

In addition, as a method for enhancing the efficacy of herbicides with low water solubility,
Cationic surfactants (JP-A-50-46834), 2-sulfonyloxyethylphosphonic acid compounds (JP-A-52-70027), thiol carbamate compounds (JP-A-52-128221) , a method of adding urea or l-methylurea (Japanese Unexamined Patent Publication No. 53-20423), etc. to the preparation, a method of using a surfactant and an organic solvent (or water) (Japanese Patent Publication No. 46-31352, Japanese Patent Publication No. 47-1988) -24123, JP-A-54-5039, etc.), a method of adding a silicate or carbonate to a preparation (Japanese Patent Publication No. 52-47016), etc. have been proposed.

[Problem that the invention seeks to solve]

The present invention is applicable to the production of granular herbicides for field use.

The purpose is to provide a formulation that has excellent herbicidal effects without affecting manufacturing equipment by 1 g.

As a method for producing granules with a particle size of 180 to 710 μm,
Adsorption and impregnation methods are preferable in terms of economy, prevention of active ingredients drifting due to the wind during spraying, and reduction of coloring of production equipment, as 2.6-dinitroaniline herbicides are generally solid at room temperature. In order to adsorb and impregnate a granular carrier having a particle size of 180 to 7104 m, it is necessary to dissolve it in an appropriate solvent. Considering the safety and health of pesticide manufacturing workers and pesticide sprayers, as well as the quality of the granular herbicide, it is necessary to use solvents that are not volatile, irritating, odoriferous, or toxic. As a solvent that satisfies a certain point of 0 or more,
Glycol derivatives such as ethylene glycol monoethyl ether, ethylene glycol monophenyl ether, diethylene glycol monobutyl ether, and octyl alcohol, which is commonly used as an organic solvent.
Examples include N-methyl-2-pyrrolidone, isophorone, and cyclohexanone. However, the granular 2,6-dinitroaniline remover (particle size: 180-710 m) obtained using the above-mentioned organic solvent had a weeding effect of only 1 to 1 minute, contrary to expectations. A granular agent (particle size 180~
710 lum) showed a slight increase in herbicidal effect, but it was still insufficient. The 2-sulfonyloxyethylphosphonic acid compound and the thiol carbamate compound, which have been proposed as a method for enhancing the removal effect, are not commercially available, and the economic efficiency during synthesis and the results of various sex tests are unknown. In addition, the use of urea or l-methylurea and silicates or carbonates is not preferred for the following reasons.
In order to uniformly support urea or l-methylurea on a granular carrier of ~710 μm, it is necessary to dissolve urea or l-methylurea in water and adsorb and impregnate it or coat it, or coat it with a high temperature liquid. In order to obtain a good quality product, it is necessary to remove excess moisture by drying, but 2.
．． Many 6-dinitroaniline-based qq removers sublimate when heated, which is undesirable due to the volatilization loss of the active ingredient during the drying process and the production equipment, and the latter method does not require drying. However, it requires an additional manufacturing process, it is difficult to coat the surface of each particle of the granular carrier evenly, there is a high possibility that the granular formulation will solidify due to a small amount of moisture, and it is difficult to apply it with a pibutaster. Urea or 1 coated from a granular carrier by the wind pressure of a blower
~ Methylurea may peel off, which is not preferable.珪MJi! Or the use of carbonate can also be used as urea or 1
-It is undesirable for the same reason as methylurea, and furthermore, the use of silicates or carbonates improves the dissolution of the active ingredient only when a large amount of water is present, such as in wood. Even if there is a small amount of water, as in the case of upland soil, it is difficult to expect the effect. When sprayed uniformly on the surface of field soil, or formulated as a powder and spread uniformly over the surface of field soil with a pipe duster, it has a more herbicidal effect than a granular agent with a particle size of 180 to 710 lm formulated using known technology. Are better. The reason for this is that when applying emulsions, irrigation agents, and powders, the active ingredients are thought to be present relatively evenly on the field soil surface.
For granular agents with a particle size of 180 to 710 pm, the surface of the field soil
Only a few particles were present per n', and this difference is considered to be the difference in herbicidal effect. Therefore, in order to provide industrially inexpensive granulated 2,6-dinitroaniline herbicides with a particle size of 180 to 710 lm, it is necessary to improve the herbicidal effect by a novel method that has not been seen before.

[Means for solving problems]

The present inventors have discovered that the 2,6-dinitroaniline herbicide N-(1-ethylpropyl)-3°4-dimethyl-2
, 6-dinitroaniline (pendimethalin), we surprisingly found that the general formula 1, where R1 is a hydrogen atom or a lower alkyl group having 1 to 4 carbon atoms, and R2 is a carbon atom number 1 to 6 lower alkyl groups or cyclohexyl groups. ) or one or more compounds represented by the general formula II (wherein R3 represents a lower alkyl group having 1 to 3 carbon atoms, and n represents a number of 1 or 2) A granular agent prepared by supporting the active ingredient on a granular carrier of 180 to 710 lm has a higher herbicidal effect than when using a commonly used organic solvent, and is comparable to the case of spraying emulsions, irrigation agents, and powders. It was discovered that the herbicidal effect was improved.

This finding was also investigated with other 2,6-dinitroaniline herbicides, but a major change in herbicidal effect was similarly observed.

(2,6-dinitroaniline type violet remover) The 2,6-dinitroaniline type r'7 agent used in the present invention is 1, for example, α, α, α-trifluoro 2,6-sinitro N,
N-dipropyl-p-toluidine, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitroaniline, N-butyl-N-ethyl-α,α,α-trifluoro2.6- Sinitro p-)luidine.

N,N-diethyl-2,6-dinitro-4-triple olomethyl-m-phenylenediamine, 3゜4-dimethyl-2,6-sinitro-N, N-cy n-propylaniline, N-5ec-butyl- 2,6-dinitroaniline such as 4-inbutynyl-3-methyl-2,6-dinitroaniline (JP-A-48-28641), 4-(methylsulfonyl)-2,6-sinitro N,N-di Examples include methylsulfonyl-2,6-dinitroaniline (West Germany, JP-A-2161879) such as propylaniline, and these 2,6-dinitroaniline-based mothkillers contain 0.1 to 10% of the total amount of the granular herbicide composition. , 0 T<-ra%, favorable 1. It is preferable to use <liO, 5-5, 0%;I, 1.

(Diphenyl compound) The compound represented by the general formula 1 used in the present invention is, for example, 3-methyldiphenyl, 4-ethyldiphenyl, 4-ethyldiphenyl,
Monoalkyldiphenyl such as butyldiphenyl, 4-hexyldiphenyl, 4-cyclohexyldiphenyl (JP-A-57-3874-94L), 2.2'-dimethyldiphenyl, 4°4'-diethyldiphenyl, 4. 4′
-Dialkyldiphenyls such as -diinpropyldiphenyl, 4,4'-dibutyldiphenyl, 4-ethyl, and 3'-butyldiphenyl (Japanese Patent Laid-open Publication No. 3873/1983).

(Naphthalene Compound) The compound represented by the general formula
2), dialkylnaphthalenes such as 2,6-dimethylnaphthalene, 2,7-dinithylnaphthalene, and 2,6-diimprobylnaphthalene (Japanese Unexamined Patent Publication No. 3872/1982).

Furthermore, the compounds represented by the general formula 1 and the general formula (■) are not necessarily limited to these exemplified compounds,
The compounds represented by the general formula I and general formula II, which may be used alone or in combination of two or more, may be handled in the same manner as ordinary solvents, and the used stitches are granular, IJ, etc. The amount is 0.2 to 10.0% by weight, preferably 0.5 to 5.0% by weight, based on the total amount of the agent composition.

(Granular carrier) Examples of the granular carrier used in the present invention include silica sand, pumice, calcium carbonate, bentonite, and clay.

Natural products such as talc, calcined diatoms, acidic silica, etc., or granulated products using these may be used, and two or more of these may be used in combination. Its particle size is 106 to 1
000 ILm, preferably from 180 to 71 OILm, especially in the range 180-710 μm to 95
Those containing at least % by weight are suitable.

(Auxiliary agent) Auxiliary agents that are commonly used when formulating agricultural chemicals can be used in the present invention if necessary. For example, fine powders such as talc, clay, white carbon, red iron, molybdenum red, etc. Pigments such as titanium white, coloring agents such as methylene blue and rotavin B, organic acids or y
! Stabilizers for active ingredients such as mechanisms, surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene sorbitan esters, polyoxyethylene alkylaryl ether sulfate salts, dialkyl sulfoco/＼phosphate ester salts, etc. may be added to the product. I can do it.

(Manufacturing method) As a method for producing the granular herbicide composition of the present invention.

The commonly used absorption and impregnation method is suitable, followed by the coating method. That is, the compound of the general formula I or the compound of the general formula II is added to the 2,6-dinitroaniline herbicide, alone or as a mixture, and stirred, and heated if necessary to form a solution. Auxiliary agents such as active ingredient stabilizers and surfactants can be added to this as necessary. This solution can be adsorbed and impregnated onto a carrier having a particle size of 180 to 7104 m, or coated on the carrier, and if necessary, fine powder such as white carbon may be added to add fluidity.

Further, other methods for producing a single granule may also be used, and this does not impede the present invention in any way.

[For production]

2,6-dinitroaniline removal using commonly used high boiling point solvents and surfactants!゛In the 5-dose granular formulation,
Compared to emulsions and hydrating agents! The herbicidal effect is improved in the case of granules containing the compound of the general formula I or the compound of the general formula II of the present invention, whereas the J effect is poor. Although this mechanism of action has not been fully elucidated, it is thought to be due to the following reasons. In other words, 1) the additive of the present invention suppresses the adsorption of the active ingredient to the carrier constituting the granule; □ suppresses the adsorption of the active ingredient eluted from the granule with water to soil particles; This is thought to be due to one or a combination of two or more of the following: (1) facilitating the diffusion of the active ingredient on the soil surface; (2) facilitating the absorption of the active ingredient into various field weeds.

〔Example〕

Next, an example will be given to demonstrate the usefulness of the granular herbicide composition for field use of undeveloped [51], but the following examples are not intended to limit the present invention in any way. All percentages and parts listed are based on Chongyang.

Example 1 95 parts of granulated pumice sieved to 180-710 JLm was placed in a mixer, and 3-methyldiphenyl 3FA was added to the mixer.
A solution in which 2 parts of pendimethalin had been dissolved in advance by heating was poured onto the mixture and mixed for 15 minutes to obtain a granular agent containing 2% pendimethalin.

Example 2 A granule containing 2% pendimethalin was obtained in the same manner as in Example 1 except that 4-butyldiphenyl was used in place of 3-methyldiphenyl in Example 1.

Example 3 A granule containing 2% pendimethalin was obtained in the same manner as in Example 1 except that 4-cyclohexyldiphenyl was used in place of 3-methyldiphenyl in Example 1.

Example 4 Granules containing 2% pendimethalin were obtained in the same manner as in Example 1 except that 4°4'-diethyldiphenyl was used in place of 3-methyldiphenyl in Example 1.

Example 5 - 4-ethyl-3'-butyldiphenyl was used in place of 3-methyldiphenyl in Example 1.

Granules containing 2% pendimethalin were obtained in the same manner as in Example 1.

Example 6 94 parts of granular silica sand sieved to 180-710 pm was placed in a mixer, and 4-ethyldiphenyl IF$, 2
．． A heated solution of 1 part of 6-diitubrobylnaphthalene and 2 parts of pendimethalin was added to the oil, mixed for 15 minutes, and then 2 parts of white carbon (trade name: Carplex #80) was added. Mixed for 15 minutes to obtain granules containing 2% pendimethalin.

Example 7 92 parts of the granular carrier used in Example 1 were placed in a mixer, and a solution prepared by heating and dissolving 4 parts of pendimethalin in 4 parts of 2-methylnaphthalene was lubricated into the mixer, and mixed for 15 minutes. Granules containing 4% methaline were obtained.

Example 8 A granular agent containing 4% pendimethalin was obtained in the same manner as in Example 7 except that 2-impropylnaphthalene was used in place of 2-methylnaphthalene in Example 7.

Example 9 A granular agent containing 4% pendimethalin was obtained in the same manner as in Example 7 except that 2,6-diituprobylnaphthalene was used in place of 2-methylnaphthalene in Example 7.

Example 1O 91 parts of the granular carrier used in Example 1 were placed in a mixer, and a heated solution of 1 part of 4-butyldiphenyl, 4 parts of 2-isopropylnaphthalene, and 4 parts of pendimethalin was added thereto, and the mixture was heated for 15 minutes. The mixture was mixed to obtain granules containing 4% pendimethalin.

Example 11 94 parts of the granular carrier used in Example 1 were placed in a mixer, and a solution prepared by heating and dissolving 2 parts of nitraline in 4 parts of 4-hexyldiphenyl was poured into the mixer and mixed for 15 minutes to obtain 2% nitraline. A granule containing the following was obtained.

Example 12 Put 95 parts of the granular carrier used in Example 1 into a mixer, add 3 parts of 4,4'-diptyldiphenyl and 997 parts of Penflu.
A solution in which 2 parts of penfluralin were dissolved in advance by heating was added with oil and mixed for 15 minutes to obtain a granular agent containing 2% penfluralin.

Example 13 93 parts of the granular carrier used in Example 1 were placed in a mixer, and a solution prepared by heating and dissolving 2 parts of dinitramine in 5 parts of 2-isopropylnaphthalene was poured into the mixer and mixed for 15 minutes to dissolve 2% dinitramine. A granule containing the following was obtained.

Comparative Example 1 94 parts of the granular carrier used in Example 1 were placed in a mixer, and a solution of 2 parts of pendimethalin dissolved in 4 parts of diethylene glycol monoethyl ether was lubricated therein, and mixed for 15 minutes. A granulate containing % was obtained.

Comparative Example 2 95 parts of the granular carrier used in Example 1 were placed in a mixer, and a solution of 2 parts of pendimethalin dissolved in 3 parts of 2-ethylhexyl alcohol was lubricated therein.

Mixing for 15 minutes yielded granules containing 2% pendimethalin.

Comparative Example 3 91 parts of the granular carrier used in Example 1 were placed in a mixer, and a mixed solution of 4 parts of diethylene glycol monobutyl ether, 2 parts of pendimethalin, and 3 parts of polyoxyethylene alkyl allyl ether sulfate was lubricated into the mixer. Mixing for a minute yielded granules containing 2% pendimethalin.

Comparative Example 4 Put 89 parts of granular silica sand sieved to 180 to 7107 Lm into a mixer, lubricate it with a mixed solution of 4 parts of isophorone, 2 parts of lauryltrimethylammonium chloride, and 2 parts of pendimethalin, and mix for 15 minutes, then white 3 parts of carbon were added and mixed for an additional 15 minutes to obtain granules containing 2% pendimethalin.

Comparative Example 5 91 parts of the granular carrier used in Example 1 were placed in a mixer, a solution of 4 parts of pendimethalin dissolved in 5 parts of ethylene glycol monophenyl ether was lubricated, and the mixer was mixed for 15 minutes to prepare pendimethalin. Granules containing 4% were obtained.

Comparative Example 6 91 parts of the granular carrier used in Example 1 were placed in a mixer, and 3 parts of cyclohexanone, 2 parts of polyoxyethylene alkyl ether, and 4F pendimethalin were added to the mixer. The mixed solution of No. 11 was added with oil, mixed for 15 minutes, and the granules containing 4% pendimethalin were added (No. 11).

Comparative Example 7 92 parts of the granular carrier used in Example 1 were placed in a mixer, and a mixed solution of 4 parts of N-methyl-2-pyrrolidone, 2 parts of polyoxyethylene alkylaryl ether, and 2 parts of nitraline was lubricated into the mixer. , mixed for 15 minutes to obtain granules containing 2% nitraline.

Comparative Example 8 94 parts of the granular carrier used in Example 1 was placed in a mixer, a mixed solution of 4 parts of isophorone and 9972 parts of Penflu was added to the mixer, and the mixture was mixed for 15 minutes to obtain a granular agent containing 2% Penfluralin. Ta.

Comparative Example 9 Put 92 parts of the granular carrier used in Example 1 into a mixer, and add 4 parts of N-methyl-2-pyrrolidone, 1 part of stearyltrimethylammonium chloride, 1 part of polyoxyethylene alkylaryl ether, and 2 parts of dinitramine. The mixed solution was oiled and mixed for 15 minutes to obtain granules containing 2% dinitramine.

Comparative Example 1O 2 parts of pendimethalin, 0.5 parts of a mixture of diisopropyl phosphate and monoisopropyl phosphate, and 97.5 parts of clay were mixed, pulverized with an impact pulverizer, and then mixed with a mixer for 15 minutes. A powder containing 2% pendimethalin was obtained.

Comparative Example 11 9710 parts of pendimethalin, 15 parts of polyoxyethylene alkyl ether, and 75 parts of xylene were mixed and dissolved to obtain an emulsion containing 10% pendimethalin.

Comparative Example 12 20 parts of nitraline, 5 parts of polyoxyethylene alkyl ether, 5 parts of white carbon, and 70 parts of fine clay were mixed, pulverized with a jet pulverizer, and mixed for 15 minutes with a mixer to obtain a mixture containing 20% nitraline. A hydrating agent was obtained.

[Soil diffusion test] Test example 1 Using an 11XI l cm pot, 2 cm from the bottom
Fill sand to a depth of 1.5 cm, then fill it with field soil (alluvial sand loam) to a depth of 10 cm, and then uniformly mix 0.5 g of crabgrass seeds and field soil to a depth of 1.5 cm. Filled to thickness. 50 mg of each preparation was applied to the center of the pot thus prepared to a diameter of 3 mm, and on the 30th day, the effect of suppressing raw ff was investigated. The growth suppression effect is categorized into ``no effect'' as 0 and ``complete withering'' as 5.
．． The area of a circular shape with a value of 5 or more was measured.

Then, the diffusion rate of the growth inhibiting area of the granular agent of Comparative Example 4 was determined as l.
OO, and the diffusion rate of each formulation was determined and shown in Table 1.

The soil water content during the test period was controlled to be 15%.

[Herbicidal effect test]

Test Example 2 The field soil pot used in Test Example 1 was controlled to have a soil moisture of 15%, and each formulation was uniformly sprayed on the soil surface in an amount of 1 mg as an active ingredient. Table 2 shows the weed suppression rate, which was evaluated using the 0-order Il standard, in which the growth inhibition effect on each weed was observed at 30[+11 days] after treatment.

Weed suppression rate judgment criteria 0 indicates no effect; 100 indicates complete death.

Table 2 [Effects of the Invention] As shown in the test examples, 2,6-dinitroaniline-based exclusion=°, the granular agent of the present invention is of general formula I or general formula H
By using one or more kinds of compounds (in some cases, a mixture of the compound of general formula I and the compound of general formula H can be used), compared to the granular agent using the known technology shown in the comparative example. As a result, the active ingredients have excellent dispersibility into field soil, and the removal effect is improved to the same extent as when spraying powders, emulsions, or wettable powders.

Furthermore, as shown in the examples, the method for producing the granular agent of the present invention is simple, and the production equipment is only slightly colored.

Therefore, according to the present invention, it has become possible to provide farmers with a granular herbicide for field use that is free from drift during spraying and has a stable herbicidal effect, which is an objective of the present invention.

Applicant: Kumiai Chemical Industry Co., Ltd.

Claims (5)

[Claims] (1) A, B in a granular carrier, (i) 2,6-dinitroaniline herbicide, and (ii) general formula I ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (R_1 in the formula is hydrogen atom, or a lower alkyl group having 1 to 4 carbon atoms, R_2 is a lower alkyl group having 1 to 6 carbon atoms, or a cyclohexyl group) or general formula II ▲ Numerical formula, chemical formula, table, etc. ▼(II) (In the formula, R_3 represents a lower alkyl group having 1 to 3 carbon atoms, and n represents an integer of 1 or 2.) Supporting one or more compounds represented by A granular herbicide composition for field use, characterized by: (2) A granular carrier is made to support a 2,6-dinitroaniline herbicide and one or more compounds of both the general formulas I and II. The granular herbicide composition for field use according to item 1. (3) The granular herbicide for field use according to claim 1, 2, or 3, wherein the granular carrier contains 95% by weight or more of particles having a particle size in the range of 180 to 710 μm. Composition. (4) Claims 1, 2, or 3 are characterized in that the 2,6-dinitroaniline herbicide is carried in an amount of 0.1 to 10.0% by weight based on the total amount of the granular herbicide composition. The granular herbicide composition for field use as described in 2. (5) One or two represented by general formula I or general formula II
0.2 to 10 of the total amount of the granular herbicide composition
．． The granular herbicide composition for field use according to claim 1, 2, or 3, characterized in that the herbicide composition is loaded at 0% by weight.