JP7016904B2 - How to make seed preparation by iron coating - Google Patents

Description

The present invention is a method for treating a seed with a herbicidal composition by an iron coating, a seed preparation with an iron coating treated with the herbicidal composition according to the above method, and a weed by sowing the seed preparation on the soil surface. Regarding control methods.

As a method for cultivating paddy rice, transplanted paddy rice cultivation in which the raised seedlings are transplanted and direct sowing paddy rice cultivation in which seeds are directly sown are widely known.

As direct-seeded paddy rice cultivation, flooded direct-seeded paddy rice cultivation and dry-field direct-seeded paddy rice cultivation are known. Also, a method of coating seeds with iron powder, calcium peroxide or molybdenum compound is generally known. In particular, iron-coated seeds coated with iron powder have been rapidly spreading in recent years because they can reduce the risk of bird damage and floating seedlings and can be sown on the surface (Non-Patent Document 1).

One of the major problems in direct sowing cultivation of iron-coated seeds is weed control. Directly sown paddy rice cultivation has a longer cultivation period than transplanted paddy rice cultivation, so weeds need to be controlled for a longer period of time. Therefore, the number of times the herbicide is sprayed increases and labor is required, so that labor saving in weed control is desired.

One of the effective methods for labor saving of pesticide application is seed treatment, and seeds treated with fungicides, seeds treated with pesticides and seeds treated with plant growth agents are widely known. (Patent Documents 1 to 3). Patent Document 4 has a solution problem of increasing the coating strength of iron powder-coated rice seeds, and by adding sulfates and chlorides to paddy rice seeds in addition to iron powder to promote the oxidation of metallic iron powder. , Disclose a method for improving the coating strength of paddy rice seeds. Further, a technique for treating paddy rice iron-coated seeds with an insecticide or a fungicide is also known. In Patent Document 5, rice seeds are surface-treated with iron powder and surface-treated or immersed with a disease-resistant inducer. The method is disclosed. Further, Patent Document 6 describes a method for treating rice seeds with a coating material such as iron powder and a fungicide or an insecticide.

Generally, in order to quickly elute the herbicidal active ingredient into the water on the rice field, a high level of pharmaceutical technology such as selection of an appropriate wetting agent and dispersant is required (Patent Document 7).

The weed control method using plant seeds treated with a herbicide is, as a typical example, coated with an adhesive resin layer containing, for example, a herbicide and, if desired, a surfactant and / or an inorganic auxiliary agent. The use of herbicide-coated rice paddy seeds (Patent Document 8) can be mentioned. This seed has an adhesive resin layer, and an adhesive resin aqueous solution containing a herbicide [herbicide active ingredient (herbicide component) or herbicide preparation], a surfactant and an inorganic auxiliary agent is applied to the surface of rice paddy seeds. After coating, it is manufactured by forced drying or air drying to form a film. The adhesive resin layer is one component or two or more components of a water-insoluble or water-soluble adhesive resin, or one component or two or more components of a water-soluble adhesive resin and one component or two or more components of a water-insoluble resin. By adjusting the mixing ratio of the water-insoluble adhesive resin and the water-soluble adhesive resin, the elution rate of the herbicidal component can be adjusted, and the effect is touted when the elution time of the herbicidal component can be controlled. ing.

Japanese Unexamined Patent Publication No. 2009-2493558 WO01 / 13722 Gazette Japanese Patent Publication No. 2011-510957 Japanese Unexamined Patent Publication No. 2005-192458 Japanese Unexamined Patent Publication No. 2014-070033 JP 2015-139390A Patent No. 3781487 Japanese Unexamined Patent Publication No. 8-275620

Iron coating flooded direct sowing manual 2010 (Incorporated Administrative Agency Agricultural and Food Industry Technology Research Organization)

However, the disease resistance inducer as described in Patent Document 5 is a drug having an action of inducing the resistance of the plant itself to the pathogen and suppressing the disease (Patent Document 5 [0009]). , The seed itself is treated and its efficacy is exerted, for example, a fungicide, an insecticide, etc. Further, Patent Document 5 [0026] states that "the method of the present invention may be used in combination with pesticides such as insecticides and herbicides used in rice cultivation." This means that pesticides such as pesticides and herbicides are used in combination when sowing seeds treated with disease resistance inducers. Therefore, the seeds coated with the herbicidal composition and the seeds coated with the herbicidal composition are not specifically known.

Further, in the production of herbicide-coated rice seeds as described in Patent Document 8, in addition to the herbicide, not only special resins of water-soluble adhesive resin and water-insoluble adhesive resin but also expensive surfactants are used. Activators and inorganic auxiliaries are used in the coating liquids of the Examples. Furthermore, the herbicide-coated rice paddy seeds of all the examples are excellent in that they are not aggregated with each other, but unlike the iron-coated seeds, the true specific density is not sufficiently heavy, so that there is no effect of suppressing floating seedlings, and bird damage. Since the preventive effect is unknown, it is not sufficient as a seed for direct sowing of paddy rice.

Therefore, to date, there is no known example of a practical seed preparation treated with a herbicidal composition by a simple treatment method. In particular, there is no specific description and no examples of weed control methods including treating seeds with an iron coating and a weed control composition.

In existing seed treatment, the essential mechanism of action is that the chemicals used are absorbed by the seeds and exert their effects, or the purpose is to control pests in an environment close to the seeds. Agents used for seed treatment have been limited to fungicides, pesticides and plant growth agents that are less likely to cause phytotoxicity. It is hoped that the herbicidal composition will not be absorbed by the seeds to be treated and will selectively act on the weeds of interest rather than on the seeds, but such techniques have not specifically been used to date. unknown. Further, when the herbicidal composition is treated on seeds, it is required that the agent to be treated is not absorbed by the seeds and is rapidly eluted from the seed system such as in the field water. In addition, the risk of phytotoxicity of existing herbicidal compositions to crop seeds is extremely high. Therefore, according to the conventional seed treatment method, it is extremely difficult to put the seed treated with the herbicidal composition into practical use. Therefore, it is considered difficult to put into practical use a seed preparation that treats a herbicide together with an iron coating with the conventional technology. Furthermore, in the case of herbicides, since the seed-treated herbicides are present in a high concentration in the vicinity of the seeds, the occurrence of phytotoxicity to the crop itself related to the seeds has become a big problem. In fact, even if the existing iron-coated seeds were treated with a commercially available herbicidal composition, a sufficient herbicidal effect could not be obtained, and in some cases, phytotoxicity was usually caused to the rice cultivation itself. Against this background, it has been difficult to put the herbicide treatment on iron-coated seeds and the weed control using the herbicide-treated seeds into practical use.

The subject of the present invention is that the pesticide component (herbicidal compound) of the herbicidal composition is rapidly eluted out of the seed system without causing chemical damage to the crop itself, particularly paddy rice, and weeds, especially paddy fields, are generated. A method for treating seeds with a herbicidal composition by iron coating, which secures the concentration of the required amount of pesticide component for a required period so that weeds can be practically controlled in It is an object of the present invention to provide a seed treatment preparation and a weed control method characterized by sowing the seed preparation on a soil surface.

As a result of diligent studies to solve the above-mentioned problems, the present inventors obtained an appropriately formulated herbicidal composition in the process of producing a seed preparation by iron coating before the oxidation reaction of iron powder was stopped. Surprisingly, the iron-coated seed preparation obtained by completing the seed treatment with the herbicide compared with the seed preparation obtained by treating the completed iron-coated seed with the herbicidal composition after the oxidation reaction was stopped. The present invention was completed by finding that the diffusion of the agent component in water is remarkably improved, practical herbicidal performance can be obtained, and that the herbicide component does not cause any chemical damage to the seeds and their growth. did.

That is, the present invention is as follows [1]-[16].
[1]
1) The process of processing iron powder on seeds,
2) The step of treating the seed with the herbicidal composition and 3) the step of stopping the oxidation reaction of the treated iron powder are included.
A method for producing an iron-coated seed preparation, which comprises carrying out the steps 1) and 2) before the step 3).
[2]
The production method according to [1], wherein 2) the step of treating the seed with the herbicidal composition is carried out, and then 1) the step of treating the seed with iron powder is carried out.
[3]
1) The step of treating the seeds with iron powder, and before the oxidation reaction of the iron powder is stopped, 2) the step of treating the seeds with the herbicidal composition, according to [1]. Manufacturing method.
[4]
The production method according to [1], wherein 1) a step of treating the seeds with iron powder and 2) a step of treating the seeds with a herbicidal composition are simultaneously carried out.
[5]
The herbicidal composition comprises at least one herbicidal compound selected from the group consisting of (A1) a bleaching herbicidal compound or a salt thereof and (A2) an acetactate synthase-inhibiting herbicidal compound or a salt thereof. The production method according to any one of [1] to [4].
[6]
(A1) Whitening-type herbicidal compounds include pyrazole-based herbicidal compounds or salts thereof, triketone-based herbicidal compounds or salts thereof, and 6-chloro-3- (2-cyclopropyl-6-methylphenoxy) pyridazine-4-yl. The production method according to [5], which is at least one selected from the group consisting of morpholine-4-carboxylate or a salt thereof.
[7]
(A2) The acetactate synthase-inhibiting herbicidal compound is at least one selected from the group consisting of a sulfonylurea-based herbicidal compound or a salt thereof and a pyrimidinyl salicylic acid-based herbicidal compound or a salt thereof, according to [5]. How to make.
[8]
(A1) At least one whitening herbicidal compound selected from the group consisting of pyrazolate and 6-chloro-3- (2-cyclopropyl-6-methylphenoxy) pyridazine-4-ylmorpholine-4-carboxylate. The production method according to [5] or [6].
[9]
(A1) The production method according to [5], [6] or [8], wherein the whitening type herbicidal compound is pyrazolate.
[10]
(A2) The production method according to [5] or [7], wherein the acetactate synthase-inhibiting herbicidal compound is a sulfonylurea herbicidal compound or a salt thereof.
[11]
In the step of treating the seed with the herbicidal composition, in addition to treating the seed with the herbicidal composition, the seed is treated with at least one of an insecticidal composition, a bactericidal composition and a plant growth agent. The production method according to any one of [1] to [10].
[12]
The production method according to any one of [1] to [11], wherein the seed is a paddy rice seed.
[13]
The iron-coated seed preparation obtained by the production method according to any one of [1] to [12].
[14]
The iron-coated seed preparation according to [13], wherein the seed is a paddy rice seed.
[15]
A weed control method comprising sowing the iron-coated seed preparation of [13] on the soil surface.
[16]
A weed control method comprising sowing the iron-coated seed preparation of [14] on the surface of paddy soil.

The herbicidal effect is imparted by sowing the seed preparation prepared according to the method for producing a seed preparation by iron coating of the present invention on the soil surface. Especially in the case of paddy rice seeds, when the seeds are sown on the surface of the paddy field, surprisingly, the seed-treated herbicidal active ingredient can be rapidly eluted into the water. Therefore, various weeds that are problematic in paddy fields, such as rice weeds such as Tainubier; water-plantain weeds such as Azena and Abnome; water-plantain weeds such as Pontederia vaginalis and Mizuaoi; / Or it is possible to control weeds of the family Pontederia vaginalis, such as Sagittaria pygmaea, Pontederia vaginalis, and Alisma canalicula, and in addition, it does not show any problematic chemical damage to seeds. Further, since the herbicide active ingredient can be treated at the same time as producing the iron-coated seed, a part of the herbicide treatment in Honda can be omitted, which can contribute to the reduction of the control work amount.
It is also possible to apply the method for producing a seed preparation by iron coating of the present invention to seeds whose germination is suppressed by, for example, heat treatment.
Therefore, the method for producing a seed preparation by iron coating and the prepared seed preparation treated with the herbicidal component of the present invention can reduce the labor required for weed control work.

Next, a method for producing a seed preparation by iron coating according to the first invention of the present application and a seed preparation by iron coating obtained by the production method according to the second invention will be described.
Unless otherwise specified, the terms used in the claims and the specification of the present application are based on the definitions generally used in the art.

The seed preparation means a seed that has been formulated with a pesticide composition. Therefore, an iron-coated seed preparation obtained by treating seeds with a herbicidal composition together with iron coating is an iron-coated seed preparation.

The method for producing a seed preparation by iron coating according to the present invention is as follows.
1) The process of processing iron powder on seeds,
2) The step of treating the seed with the herbicidal composition and 3) the step of stopping the oxidation reaction of the treated iron powder are included.
It is characterized in that step 1) and step 2) are carried out before step 3).
As the seed treatment method in the seed treatment steps of the above steps 1) and 2), seed treatment techniques known in the art, such as a seed flour coating method, a seed coating method, and a seed dusting method, are used within the scope of the present invention. , Seed dipping method, seed pelleting method and the like can be used. Above all, it is preferable to use the seed coating method in both steps 1) and 2).

As the seed coating method used in step 1) (preparation of a seed preparation by iron coating) of the present invention, any method known in the art can be used. For example, it is a method described in the iron coating flooded direct sowing manual 2010 (Incorporated Administrative Agency Agricultural and Food Industry Technology Research Organization). More specifically, after soaking the dried seeds at room temperature for 3 to 4 days, excess water is drained, and while adding water to the seeds, a mixed powder of iron powder and gypsum is added to coat the seeds. In addition, it can usually be powdered with a smaller amount of gypsum as a finishing touch. Next, under the condition that the oxidation reaction proceeds in the iron component of the coated seed, the seed is allowed to stand for a certain period of time to form iron hydroxide, that is, iron rust on the seed. In the seed preparation, after iron rust is formed on the coated seeds and sufficient hardness is obtained, the seeds are subjected to a drying process under a temperature condition of 40 ° C. or lower which does not affect the germination of seeds. It is obtained by evaporating the water on the seed surface to stop the oxidation reaction (step 3)). The time required to stop the oxidation reaction varies depending on the temperature and humidity of the outside air, but it is desirable to allow it to stand for at least one day.

Examples of the iron powder used in the present invention include reduced iron powder, atomized iron powder, electrolytic iron powder, iron oxide powder, and the like, and a mixture of two or more of these can also be used. In the present invention, it is preferable to use reduced iron powder, iron oxide powder or a mixture of reduced iron powder and iron oxide powder. In addition, iron powder available as a commercially available product can be used. Specific examples thereof include DSP317 iron powder (manufactured by DOWA IP Creation Co., Ltd.), agricultural iron powder (manufactured by Daitetsu Kogyo), and agricultural iron powder (manufactured by Tetsugen). The particle size of the iron powder may be powdery, preferably 10 to 100 μm, and particularly preferably the reduced iron powder has a small particle size of 100 μm or less. The gypsum used as needed may be powdered calcium sulfate / 1/2 hydrate (CaSO _4.1 / 2H ₂ O), and commercially available gypsum can be used.
The amount of iron powder used for the treatment is preferably 0.05 to 1.0 part by weight, more preferably 0.2 to 0.5 part by weight, based on 1 part by weight of the seeds. The amount of gypsum to be mixed with the iron powder is preferably 1 to 25% with respect to 100% of the iron powder, and more preferably 5 to 10%. The amount of gypsum used for finishing is preferably 0 to 10%, more preferably 0.1 to 5% with respect to 100% iron powder.

In the present invention, water and oxygen are required for the oxidation reaction of the iron component of the coated seed. The water required for the oxidation reaction is supplied from the water contained in the seeds by immersing the seeds in advance, the water added at the time of granulation of the iron-coated seeds, or the water contained in the herbicidal composition itself or its diluted solution. To. Oxygen required for the oxidation reaction is supplied from oxygen contained in the atmosphere of the environment where the iron coating is applied and in the water used. It is generally said that the oxidation reaction is stopped when the thickness of the water layer on the iron surface becomes smaller and when the relative humidity of the air becomes about 50% or less. Therefore, in order to stop the oxidation reaction, It is necessary to control the moisture content of the iron-coated seeds by subjecting them to the drying process and reduce them as necessary. The oxidation reaction can usually be carried out at room temperature by appropriately supplying water to the seeds. In order to promote oxidation, the seeds are subjected to a step of repeating hydration and drying, and the reaction usually proceeds by allowing the seeds to stand for 3 to 7 days. This method is a preferable method for sensing heat generation due to the progress of the oxidation reaction.

In the present invention, in the oxidation reaction of the iron component of the coated seed, the treated iron powder is oxidized to form iron hydroxide, that is, iron rust, and it is necessary to proceed with the oxidation until the iron component is not missing from the seed. It is possible to confirm and judge whether the oxidation reaction is proceeding or stopped by observing the exothermic state of the seeds. That is, "stopping the oxidation reaction of the iron component" means, for example, when the temperature of the seed is observed with a non-contact thermometer or the like, the temperature of the seed does not change under the conditions of normal temperature and 50% relative humidity. be. However, in a state where the formation of iron rust is insufficient, if the coated seeds have a large amount of water, no temperature change may be observed due to the heat of vaporization. It is necessary to evaluate with a uniform coating.

In the first invention of the present application, a step (step 2) of treating the seed with the herbicidal composition is carried out before the oxidation reaction of the iron powder coated on the seed is stopped. In one embodiment, the seeds can be treated with the herbicidal composition (step 2)) and then the seeds can be treated with iron powder (step 1). As one embodiment, after the seeds are treated with iron powder (step 1)), the seeds can be treated with the herbicidal composition (step 2) before the oxidation reaction of the iron powder is stopped. As one embodiment, the step of treating the seeds with iron powder (step 1)) and the step of treating the seeds with the herbicidal composition (step 2)) can be carried out at the same time. That is, the seeds can be treated with iron powder and the herbicidal composition at the same time.

As the seed coating method used in step 2) of the present invention, any method known in the art can be used. For example, the seeds can be treated with the herbicidal composition by putting the seeds into a stirrer such as a mixer, then putting the herbicidal composition into the stirrer with the seeds flowing, and stirring at room temperature. The stirring time can be appropriately selected depending on the weight of the seeds to be added, but it is usually preferable that the treated seeds are allowed to stand when the coating is uniform in appearance.

As a method of simultaneously carrying out step 1) and step 2), for example, after putting the seeds into a stirrer such as a mixer, iron powder in a state where the seeds are flowing, and if necessary, a roasted gypsum and a herbicidal composition. A method of treating a herbicidal composition into seeds by putting the mixture into a stirrer and stirring at room temperature, or a method of putting the seeds into a stirrer such as a mixer and then flowing the seeds into a herbicidal composition. , Iron powder and, if necessary, a mixture of roasted gypsum are alternately put into a stirrer and stirred at room temperature to treat the seeds with the herbicidal composition. The stirring time can be appropriately selected depending on the weight of the seeds to be added, but it is usually preferable that the treated seeds are allowed to stand when the coating is uniform in appearance.

The herbicidal composition used in the present invention is, for example, bound based on, for example, a pesticide formulation technique known in the art as long as it is within the scope of the present invention, in addition to the pesticide active ingredient (herbicidal compound) which is an active ingredient. Auxiliary components such as agents, disintegrants, wetting agents, dispersants, thickeners, defoaming agents, fungicides, solvents, stabilizers, colorants, bulking agents, preservatives, and / or pH adjusters. Can be added.

Examples of the binder used in the herbicidal composition of the present invention include dextrin, polyvinyl alcohol, polyvinylpyrrolidone, a salt of carboxymethyl cellulose, methyl cellulose, gum arabic, polyethylene glycol or a derivative thereof, tab powder, bentonite, and lignin sulfonate. Examples thereof include carboxylic acid or sulfonic acid type polysoap. Of these, lignin sulfonate or carboxylic acid or sulfonic acid type polysoap can also be used as a dispersant and is suitable.

The disintegrant, wetting agent or dispersant used in the herbicidal composition of the present invention is not particularly limited as long as it is used for ordinary pesticides, and is an anionic surfactant, a nonionic surfactant, or a cation. Any surfactant such as ionic surfactant or zwitterionic surfactant can be used, and one or more of these can be used.

Examples of the anionic surfactant used in the herbicidal composition of the present invention include an alkyl phosphate ester salt, an alkyl sulfate ester salt, a polyoxyalkylene alkyl ether phosphoric acid ester salt, a polyoxyethylene alkyl ether sulfate ester salt, and an alkylaryl. Phosphoric acid ester salt, alkylaryl sulfate ester salt, polyoxyalkylene alkylaryl ether phosphoric acid ester salt, polyoxyalkylene alkylaryl ether sulfate ester salt, alkylphenol phosphate, alkylphenol phosphoric acid ester salt, alkylphenol sulfate, alkylphenol sulfate ester salt, polyoxy Alkylenealkylphenol phosphate, polyoxyalkylene alkylphenol phosphate ester, polyoxyalkylene alkylphenol sulfate, polyoxyalkylene alkylphenol sulfate ester, styrylphenol phosphate, styrylphenol phosphate ester salt, styrylphenol sulfate, styrylphenol sulfate ester salt, Polyoxyalkylene styrylphenol phosphate, polyoxyalkylene styrylphenol phosphate ester salt, polyoxyalkylene styrylphenol sulfate, polyoxyalkylene styrylphenol sulfate ester salt, dystyrylphenol phosphate, dystyrylphenol phosphate ester salt, dystyrylphenol Sulfate, distyrylphenol sulfate ester, polyoxyalkylene distyrylphenol phosphate, polyoxyalkylene distyrylphenol phosphate ester, polyoxyalkylene distyrylphenol sulfate, polyoxyalkylene distyrylphenol sulfate, tristilyl Phenolic Phosphate, Tristyrylphenol Phosphate Ester, Tristilylphenol Sulfate, Tristilylphenol Sulfate, Polyoxyalkylene Tristilylphenol Ester, Polyoxyalkylene Tristilylphenol Phosphorus Ester, Polyoxyalkylene Tristilylphenol Sulfate Examples thereof include salts, polyoxyalkylene tristylylphenol sulfate ester salts, alkyl succinate sulfonates, dialkyl succinate sulfonates or polyoxyalkylene dialkyl succinate sulfonates, and preferred are alkyl phosphate ester salts and poly. Oxyalkylene alkyl ether phosphoric acid ester salt, alkylaryl phosphoric acid ester salt, polyoxya Lucilene alkylaryl ether phosphate ester salt, alkylphenol phosphate, styrylphenol phosphate ester salt, polyoxyalkylene styrylphenol phosphate ester salt, distyrylphenol phosphate, distyrylphenol phosphate ester salt, polyoxyalkylene distyrylphenol phosphate, Examples thereof include polyoxyalkylene distyrylphenol phosphate ester salt, tristilylphenol phosphate, tristilylphenol phosphate ester salt, polyoxyalkylene tristilylphenol phosphate or polyoxyalkylene tristilylphenol phosphate ester salt.

Examples of the nonionic surfactant used in the herbicidal composition of the present invention include an aliphatic alcohol alkylene oxide adduct, a polyalkyleneoxy fatty acid ester, a sorbitan-based surfactant or an alkylene oxide adduct thereof, and a polyglycerin fatty acid ester. , Alkylpolysaccharide-based surfactant, sucroselide, polyoxyalkylene alkyl ether, polyoxyethylene alkyl ether, polyoxyalkylene alkylaryl ether, polyoxyalkylene alkylphenol ether, polyoxyalkylene styrylphenol ether, polyoxyalkylene distyryl Examples thereof include phenol ethers and trioxyalkylene tristylyl phenol ethers, preferably polyoxyalkylene alkyl ethers, polyoxyethylene alkyl ethers, polyoxyalkylene alkyl aryl ethers, polyoxyalkylene alkyl phenol ethers, polyoxyalkylene styryl phenol ethers and the like. , Polyoxyalkylene distyrylphenol ether, polyoxyalkylene tristylylphenol ether and the like.

In addition, in the type of surfactant to which these ethylene oxides are added, propylene oxide may be contained as a part thereof.

Examples of the cationic surfactant used in the herbicidal composition of the present invention include an aliphatic tertiary amine or a salt thereof, an aliphatic tertiary amine aliphatic amine alkylene oxide adduct or a salt thereof or an aliphatic quaternary amine. Examples include quaternary amine salts.

Examples of the amphoteric surfactant used in the herbicidal composition of the present invention include amino acid-type amphoteric surfactants such as sodium laurylaminopropionate; betaine-type amphoteric such as lauryldimethylbetaine, stearyldimethylbetaine, and lauryldihydroxyethylbetaine. Examples thereof include carboxylate-type amphoteric surfactants such as surfactants; sulfate ester-type amphoteric surfactants; sulfonate-type amphoteric surfactants; or phosphate ester-type amphoteric surfactants.

The surfactant used in one embodiment of the herbicidal composition used in the present invention is preferably an anionic surfactant or a nonionic surfactant.

The amount of the surfactant used in one embodiment of the herbicidal composition used in the present invention is usually 0.01 to 20% by weight in the herbicidal composition, preferably 0.1 to 20% by weight. It is 10% by weight.

The thickener used in the herbicidal composition of the present invention is not particularly limited as long as it is usually used in pesticide preparations, but for example, white carbon, aluminosilicate, bentonite, montmorillonite, hectrite, and attapulsite. Minerals or high molecular weight thickeners such as arabic gum, tragant gum, xanthan gum, guar gum, roasted bean gum, casein, alginic acid, cellulosic polysaccharides, ethyl cellulose, polyvinyl alcohol, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose. And the like, preferably a high molecular weight thickener, and more preferably xanthan gum.

The defoaming agent used in the herbicidal composition of the present invention is not particularly limited as long as it is usually used in pesticide preparations, but is a lower alcohol type such as methanol, ethanol, isopropanol, sec-butanol and butanol. Defoamers; amyl alcohol, diisobutyl carbitol, tributyl phosphate, oleic acid, tall oil, metal shavings, low HLB surfactants (eg, sorbitan lauric acid monoester, sorbitan lauric acid triester, polyethylene glycol fatty acid ester, Acetylene glycol derivatives, Pluronic® non-ionic surfactants, etc.), organic polar compound defoamers such as acetylene glycol derivatives; surfactant formulations of mineral oils, surfactants of mineral oils and fatty acid metal salts Examples thereof include mineral oil-based defoamers such as agent-blended products; silicone resins, surfactant-blended products of silicone resins, and silicone resin-based defoamers such as silicone resin inorganic powder-blended products.

The antifungal agent used in the herbicidal composition of the present invention is not particularly limited as long as it is usually used in pesticide preparations, and for example, parachloromethoxylenol, polyhesamethylene biguanidide hydroxychloride, 1, 2-Benzisothiazolin-3-one, methylparahydroxybenzoate, ethylparahydroxybenzoate, propylparahydroxybenzoate, butylparahydroxybenzoate, heptylparahydroxybenzoate, benzylparahydroxybenzoate, paraoxybenzoic acid ester, sorbic acid, orthophenyl Phenol, Sodium Orthophenylphenate, Glutardialdehyde, Tertiary Ammonium Compound, Tri- (N-Chlorohexyldiazenium Dioxy) -Aluminum, Tetrahydro-3,5-dimethyl-2H-1,3,5- Thiasiazin-2-thione, 2,5-dimethoxytetratransferase, dimethylolurea, sodium N-methyldithiocarbamate, phenoxyethanol, glyoxal, glutaaldehyde, 1,3,5-tris (2-hydroxyethyl) -1,3,5- Examples thereof include hexahydrotriazine, benzalkonium chloride, phenoxypropanol, tetramethylacetylenediurea, povidoneiodin, potassium sorbate, 2-bromo-2-nitropropane-1,3-diol or thiazolone.

The solvent used in the herbicidal composition of the present invention is not particularly limited as long as it is usually used for pesticides, but a solvent having a flash point of second petroleum or higher is desirable. For example, alkylbenzene, methylnaphthalene, liquid paraffin, ligroine, kerosine, kerosene, n-decane, isododecane, tetraline, decalin, terepine oil, pine oil, adipic acid, gluconic acid, maleic acid, lactic acid, benzoic acid, phthalic acid, apple. Acids, fumaric acid, succinic acid, tartaric acid, citric acid, lauric acid, oleic acid, palm oil fatty acids, cyclohexanone, cyclohexenylcyclohexanone, acetylacetone, acetophenone, methylbutylketone, ethylene glycol, diethyleneglycol, triethyleneglycol, propylene Glycol, dipropylene glycol, tripropylene glycol, epichlor hydrin, diglycidylate, dioxane, triethyl phosphate, tributyl phosphate, soybean oil, rapeseed oil, sesame oil, rice oil, coconut oil, sunflower oil, sardine oil , Whale oil, dimethylsulfoxide, N, N-dimethylacetamide or N-methylpyrrolidone and the like.

The colorant used in the herbicidal composition of the present invention is not particularly limited as long as it is usually used for pesticides, and examples thereof include dyes, preferably Brilliant Blue FCF, Cyanine Green G or Erio Green G. Is. The amount of colorant used is usually 0.05 to 0.5% by weight, preferably 0.1 to 0.3% by weight, in the granular pesticide composition.

Examples of the bulking agent used in the herbicidal composition of the present invention include fine powders of mineral substances generally used as carriers of pesticides such as bentonite, talc, clay, diatomaceous soil, amorphous silicon dioxide, calcium carbonate and magnesium carbonate. In addition, resin powders such as vinyl chloride, chlorinated polyethylene and chlorinated polypropylene, sugars such as glucose, sugar and lactose, carboxymethyl cellulose or its salts, starch or its derivatives, microcrystalline cellulose, wood flour, rice bran, bran and rice husks. Examples thereof include organic substances such as powder, coffee bean powder, cellulose powder and licorice powder, water-soluble inorganic salts such as sodium sulfate, ammonium sulfate and potassium chloride, and urea. Examples of the bentonite include bentonite Hotaka, Fuji (manufactured by Hojun Co., Ltd.), Knigel V1, V2 (manufactured by Kunimine Kogyo Co., Ltd.), bentonite KG-1, KA-1 (manufactured by Nippon Bentonite Co., Ltd.) and the like. The blending amount of the bulking agent is the minimum amount required excluding the essential components of the herbicidal composition of the present invention, and varies depending on the type of the bulking agent, but is usually 0.1 to 90 weight in the herbicidal composition. %, Preferably 0.5 to 70% by weight.

The preservative used in the herbicidal composition of the present invention is not particularly limited as long as it is usually used for pesticides, and preferably sorbic acid, potassium sorbate, parachloromethoxylenol, and paraoxybenzoic acid. It is butyl or sodium dehydroacetate. The amount of preservative used is usually 0.1 to 3% by weight, preferably 0.2 to 2% by weight, in the herbicidal pesticide composition.

The pH adjuster used in the herbicidal composition of the present invention is not particularly limited as long as it is usually used for pesticides, and for example, inorganic acids such as hydrochloric acid and phosphoric acid; citric acid, phthalic acid and succinic acid. Organic acids such as; organic metal salts such as sodium citrate, potassium hydrogen phthalate; disodium hydrogen phosphate, sodium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, sodium carbonate, potassium carbonate, etc. Inorganic metal salts such as sodium borate; hydroxides such as sodium hydroxide, potassium hydroxide; or organic amines such as triethanolamine can be mentioned, preferably inorganic acids, inorganic metals and the like. Salts or hydroxides, more preferably hydrochloric acid, citric acid, succinic acid, sodium hydroxide, potassium hydroxide, sodium carbonate and the like. Further, the pH adjuster used may be one kind or a combination of two or more kinds.

The herbicidal composition of the present invention can be produced by a known formulation process such as mixing, granulation, pulverization, and drying, which are used in the production of ordinary pesticide formulations. Further, the herbicidal composition can be used in a state of being miscible in advance with an oxidation accelerator such as iron powder or gypsum, which is a material related to iron coating. In this case, the herbicidal composition used in the method for producing a seed preparation by iron coating of the present invention is a herbicidal compound as long as the drug can be uniformly treated on the seeds without impairing the iron coating property on the seeds. Although it may contain only the drug substance of, it usually needs to be formulated into an appropriate pharmaceutical form. Suitable pharmaceutical types and methods for formulating the herbicidal composition include the following (1) to (9), and the herbicidal composition is atomized by wet or dry grinding, or is aqueous or aqueous. It needs to be molded so that the seeds can be uniformly covered by dissolving in an oily solvent. However, even if it is a formulation type or a formulation method other than these, it can be used in the present invention as long as good coverage of the drug on seeds can be ensured.
(1) An aqueous dispersion obtained by wet pulverizing an active ingredient of a herbicidal pesticide in water with an auxiliary ingredient such as a surfactant added as needed.
(2) An oil-based dispersion obtained by wet pulverizing an active ingredient of a herbicidal pesticide in a non-polar solvent by adding an auxiliary ingredient such as a surfactant as needed.
(3) Raw powder obtained by dry-grinding the active ingredient of herbicidal pesticides together with auxiliary ingredients such as surfactants as needed.
(4) An aqueous dispersion obtained by dispersing the bulk powder obtained in (3) in water together with an auxiliary component such as a surfactant, if necessary.
(5) An oil-based dispersion obtained by dispersing the bulk powder obtained in (3) in a non-polar solvent together with an auxiliary component such as a surfactant, if necessary.
(6) A liquid preparation obtained by dissolving the active ingredient of a herbicidal pesticide with water and, if necessary, an auxiliary ingredient such as a surfactant.
(7) Emulsion obtained by dissolving the active ingredient of herbicidal pesticide in a non-polar solvent by adding an emulsifier and, if necessary, an auxiliary ingredient such as a surfactant.
(8) The bulk powder obtained by dry-grinding the granular herbicidal composition.
(9) A liquid composition obtained by dispersing and dissolving a granular herbicidal composition in water or in a non-polar solvent by adding an auxiliary component such as a surfactant as necessary.

In the present invention, a method for producing a seed preparation by iron coating can be applied to seeds of any variety. Examples of seeds to which this technique can be applied include paddy rice, wheat, barley, soybean, corn, and sugar beet. It is preferable to sow in a flooded state, and paddy rice is particularly preferable. However, it is preferable to use paddy rice seeds of varieties that are not sensitive to the herbicidal composition. In the present invention, "insensitive" means that no phytotoxicity occurs in the chemical treatment in a flooded state in normal transplantation cultivation.
It is clear to those skilled in the art which varieties of paddy rice seeds are not sensitive to herbicidal compositions, but varieties of paddy rice seeds that are not sensitive to herbicidal compositions include, for example, Koshihikari. , Hinohikari, Hitomebore, Akitakomachi, Kinuhikari, Nanatsuboshi, Haenuki, Kirara 397, Masigura, Tsugaru Roman, Nihonbare, etc. In addition, paddy rice seeds that are not sensitive to PPO-inhibiting herbicidal compounds and VLCFAE-inhibiting herbicidal compounds, such as Koshihikari, Hinohikari, Hitomebore, Akitakomachi, and Kinuhikari, can also be preferably used.
On the other hand, examples of paddy rice seeds of varieties that are sensitive to the herbicidal composition include Habataki, Takanari, Momiroman, Mizuhochikara, Luriaoba, and Surprise Mochi, which are sensitive to mesotrione and benzobicyclon. .. Paddy rice seeds that are sensitive to these herbicidal compositions are described, for example, in "Crop Science Society of Japan Journal 79 (Annex 1)".

As the paddy rice seeds used in the present invention, seeds that can be sown can be used. Further, in the iron-coated seed preparation used in the present invention, calcium peroxide, molybdenum compound and the like can be used at the same time as the coating agent in addition to iron powder.

The herbicidal composition used in the present invention contains any herbicidal compound usually used in paddy fields as an active ingredient. Examples of such herbicidal compounds include (A1) bleaching herbicidal compounds, (A2) acetactate synthase (hereinafter referred to as ALS) inhibitory herbicidal compounds, and (A3) protoporphyrinogen oxidase (hereinafter referred to as PPO). ) Inhibitory herbicidal compounds and (A4) very long chain fatty acid elongating enzyme (hereinafter referred to as VLCFAE) inhibitory herbicidal compounds are widely known and can be used in the present invention. Of these, it is preferable to contain at least one selected from the group consisting of (A1) a bleaching type herbicidal compound or a salt thereof and (A2) an ALS-inhibiting type herbicidal compound or a salt thereof. Hereinafter, these herbicidal compounds will be described, and these herbicidal compounds include the form of the salt thereof.

で表される６－クロロ－３－（２－シクロプロピル－６－メチルフェノキシ）ピリダジン－４－イル モルホリン－４－カルボキシレート（以下、化合物（Ｉ）ともいう）などが挙げられる。 (A1) The bleaching type herbicide compound is a well-known herbicide that whitens and kills weeds. Examples of the whitening-type herbicidal compound in the present invention include a pyrazole-based herbicidal active compound, a triketone-based herbicidal active compound, chromazone (CAS No. 81777-89-1), or the following general formula (I):

Examples thereof include 6-chloro-3- (2-cyclopropyl-6-methylphenoxy) pyridazine-4-ylmorpholine-4-carboxylate (hereinafter, also referred to as compound (I)) represented by.

Examples of the pyrazole-based herbicidal active compound include pyrazolate, pyrazoxifene, and benzophenap, which are described in The Pesticide Manual 13th Edition, pp. 844-845, 884-849, 81, respectively. These compounds belong to the F2 group of the HRAC taxonomy.
Examples of the triketone-based herbicidal active compound include mesotrione, sulcotrione, benzobicyclon, tefryltrione, and bicyclopyrone, which are described in The Pesticide Manual 13th Edition, pp. 631-632, 908-909, 80, respectively. Has been done. These compounds belong to the F2 group of the HRAC taxonomy. In addition, tefryltrione (CAS No. 473278-76-1) and bicyclopyrone (CAS No. 352010-68-5) are also triketone-based herbicidal compounds.

Chromazone belongs to the F4 group of the HRAC taxonomy.
(A2) The ALS-inhibiting herbicidal compound is a well-known herbicidal compound that inhibits the synthesis of the essential amino acids valine, leucine and isoleucine by inhibiting ALS and kills weeds. Examples of the ALS-inhibiting herbicidal compound include a sulfonylurea-based herbicidal compound, a pyrimidinyl salicylic acid-based herbicidal compound, and a triazolopyrimidine-based herbicidal compound. These compounds belong to Group B of the HRAC taxonomy.

Examples of the sulfonylurea herbicidal compound include azim sulfuron, benzulfuron-methyl, cyclosulfamron, halosulfuron-methyl, ethoxysulfuron, imazosulfuron, pyrazosulfuron-ethyl, chlorimlon-ethyl, sinosulfone-methyl, and flusetos. Examples include ruflon, propyrylfuron, metazosulfone and the like, 46-47, 73-74, 222-223, 523-524, 386-387, 560-561, 847-848, 161 of The Pesticide Manual 13th Edition, respectively. 162, 184-185, 677-678. Further, flucetosulflon (CAS No. 412928-75-7), propyrisulfuron (CAS No. 570415-88-2), metazosulflon (CAS No. 8688680-84-6) and the like are also sulfonylurea herbicidal compounds. be.

Examples of the pyrimidinyl salicylic acid-based herbicidal compound include bispyrivac, pyribenzoxim, pyriphthalide, pyrimisulfan, pyrimisulfan or triafamon, respectively, of The Pesticide Manual 13th Edition 96-97, 852-853, 860-861, respectively. , 863-864. Further, pyrimisulfan (CAS No. 221205-90-9), triafamon (CAS No. 874195-61-6) and the like are also pyrimisulfan salicylic acid-based herbicidal compounds.

Triazolopyrimidine-based herbicidal compounds include, for example, penoxslam, which is described on pages 753-754 of The Pesticide Manual 13th Edition.
(A3) The PPO-inhibiting herbicidal compound is a well-known herbicidal compound that inhibits PPO, causes browning symptoms, and kills weeds. The PPO-inhibiting herbicidal compounds are, for example, oxadiargyl, oxadiazone, pentoxazone and the like, and are described in The Pesticide Manual 13th Edition, pp. 725-726, 727-728, 757-758, respectively.

(A4) VLCFAE-inhibiting herbicidal compound is a well-known herbicidal compound that inhibits VLCFAE, inhibits fatty acid synthesis, and kills weeds. VLCFA-inhibiting herbicidal compounds are, for example, butachlor, pretilachlor, tenylchlor, mephenacet and the like, as described in The Pesticide Manual 13th Edition, pages 118-120, 799-800, 956, 621-622, respectively.

Regarding the prescribed mechanism of action and classification of these herbicidal compounds, for example, "2012 Paddy Rice-related Herbicide Test Application Form (Test Plan and Drug Characteristics)" (Japan Plant Regulator Research Association) , "HRAC (Herbicide Response Action Mechanism), According to HRAC classification on mode of action".

The concentration of the herbicidal compound in the herbicidal composition can be appropriately determined depending on the type of the herbicidal compound and the pharmaceutical form used.
In the treatment of seeds in step 2), the amount of the herbicidal composition to be treated can be appropriately determined according to the type of the herbicidal compound and the pharmaceutical form of the herbicidal composition. For example, the amount of the herbicidal composition to be treated can be determined so that 0.01 g to 3000 g, preferably 0.1 g to 1000 g, of the active ingredient herbicidal compound is treated per 1 kg of seeds.

In the method for producing a seed preparation by iron coating of the present invention, the seed may be treated with the herbicidal composition alone, or a fungicide, an insecticide, an acaricide, a nematode, a chemical damage reducing agent or a plant growth agent. May be processed at the same time. The bactericidal agent to be treated at the same time is not limited to these, and for example, strovyllin-based compound, anilinopyrimidine-based compound, azole-based compound, dithiocarbamate-based compound, phenylcarbamate-based compound, organic chlorine-based compound, benzimidazole-based compound, and the like. Phenylamide compound, sulfenic acid compound, copper compound, isoxazole compound, organic phosphorus compound, N-halogenothioalkyl compound, carboxyanilide compound, morpholine compound, organic tin compound or cyanopyrrole compound And the like, and can be used in combination of one kind or more. The pesticide, acaricide, and nematode-killing agent are not limited to these, and are, for example, pyrethroid compounds, organic phosphorus compounds, oxime-carbamate compounds, carbamate compounds, neonicotinoid compounds, and diacylhydrazine-based compounds. Compounds, benzoylurea compounds, immature hormone compounds, cyclodiene organic chlorine compounds, 2-dimethylaminopropane-1,3-dithiol compounds, amidin compounds, phenylpyrazole compounds, organic tin compounds, METI compounds , Benzilate-based compounds, allylpyrrole-based compounds, dinitrophenol-based compounds, anthranyl-diamide-based compounds, oxadiadin-based compounds, semicarbazones-based compounds, tetronic acid-based compounds, carbamoyltriazole-based compounds, tetradine-based compounds, etc. Can be used in combination with seeds or more.

Specifically, for example, the following compounds can be mentioned.
That is, azoxystrobin, cresoxym-methyl, trifluorostrobin, metominostrovin, orysastrobin, orysastrobin, pyraxystrobin, pyraxystrobin, and pyracrostrobin. ) And other strovyllin compounds; anilinopyrimidine compounds such as mepanipyrim, pyrimethanil, cyprodinil; triadimephon, bitertanol, bitertanol, triflumetol , Compoundonazole, penconazole, flusilazole, microbutanil, cyproconazol, cyproconazol, tebuconazol, tebuconazol, tebuconazol, tebuconazol, tebuconazol, tebuconazol ), Fenarimol, imazalyl, epoxyconazole, prothioconazole, ipconazole, pefurazoate compound, pefurazoate, qinate compound, etc. Dithiocarbamate compounds such as maneb, zineb, mancozeb, polycarbamate, probeneb, tiram; dietofencarbophenyl (Chlorothalonil), organic chlorine compounds such as quintozone; benomyl, thiophanate-methyl, carbendazim (c). Benzimidazole compounds such as arbendazole; metalaxyl, metalaxyl-M, oxazyl-M, oxadixyl, offrace, benalaxyl, furaxyl, furaxyl, furaxyl, furaxyl, furaxyl, furaxyl. Amid-based compounds; Sulfenic acid-based compounds such as dichlofluand; Copper-based compounds such as copper hydroxide and oxyquinoline copper; hydroxyisoxazole and the like. Isoxazole-based compounds; organic phosphorus-based compounds such as fosetyl-alluminium and trolclofos-methyl; N-halogenothioalkyl-based compounds such as captan, captafol, and folpet. Compounds; dicarboxyimide compounds such as procymidone, iprodione, vinclozolin; flutranil, mepronil, furametopyl, furametopyl, tifluzamide, tyfluzamidi (Penthiopyrad), isofetamide, fluopylam, sedaxane, bixafen, penflufen, floxapyroxad, fluxapyloxad, isopyraze, isopyrazad Carboxanilide compounds; morpholine compounds such as fenpropimorph and dimethomorph; organic tin compounds such as triphenyltin hydroxide and fentin acetate; fludioxonyl. (Fludioxonil), cyanopyrrole such as fenpiclonil Cyhalothrin; Other tricyclazole, pyroquilon, carpropamide, diclocymet, phenoxanil, futhalide, fluthrin, fluthrin, fluthrin. Pyriphenox, fenpropidin, pencyclon, ferrimzone, cyhalothrin, amisulbrom, amisulbrom, iprovaricarbibalbi-balibicar. Albesilate-albesilate, cyfluthrinamide, casugamycin, validamycin, isoprothiolane, isoprothiolane, streptomycin, streptomycin Bactericides such as compounds, tiadinil, isotianil, tolprocarb, MIF-1002, aclinathrin, allethrin [(1R) -isomer), bifenthrin (1R) -bifenthrin. bioallethrin, bioallethrin S-cyclopentenyl isomer (bioallethrin S-cyclopentenyl isomer), bioresmethrin, cycloprothrin, cyhalothrin, cyhalothrin, cyhalothrin, cyhalothrin -Cyhalothrin (gamma-cyhalothrin), lambda-cyhalothrin (lambda-cyhalothrin), cypermethrin (cypermeth) rin), alpha-cypermethrin (alpha-cypermethrin), beta-cypermethrin (beta-cypermethrin), seta-cypermethrin (theta-cypermethrin), zeda-cypermethrin (zeta-cypermethrin), cypermethrin [Cypermethrin [(1R) -trans-isomer]), deltamethrin [(EZ)-(1R) -isomer] (empenthrin [(EZ)-(1R) -isomer]), es. Fenvalerate, etofenprox, fenpropatrin, fenvalerate, flucythrinate, flumethrin, tau-fluvalate, tau-fluvalate Prox (halfenprox), imiprothrin, methothrin, methothrin, permethrin, phenothrin [(1R) -trans-isomer] (phenothrin [(1R)) pyrethrin, resmethrin, RU15525 (kadethrin), cypermethrin, tefluthrin, tetramethrin, tetramethrin [(1R) isthrin), tetramethrin [(1R) Tralomethrin, transfluthrin, ZXI8901, biopermethrin, furamethrin, profluthrin, profluthrin, profluthrin, flubrocytorinate, etc. Various isomers;
Acephate, azamethiphos, diazinon-methyl, azinphos-ethyl, cadusafos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos. chlormephos, chlorpyrifos, chlorpyrifos-methyl, cumaphos, CYAP (cyanophos), demethon-S-methyl (demethon-diapy) Dichlofention, DDVP (dichlorvos), dichlorpyrifos, dimethoate, dimethylbinphos, disulfoton (ethylthiometon), disulfoton (ethylthiometon) (disulthiometon) Phenylphosphonothioate (O-ethyl O-4-nitrophenyl phenylphosphonothioate), ethion, ethoplophos, famphur, phenamiphos, phenamiphos, phenamiphos, phenamiphos, phenamiphos, phenamiphos, phenamiphos, phenamiphos )), Hostizate, heptenophos, isofenphos-methyl, Isocarbophos (isopropyl O- (methoxyaminothio = phosphoryl) salicylate, isoxathione), isoxathione (isoxathion) Mecarbam, methamidophos, DMTP (methidation), mevinphos, chlorpyrifos, BRP (nared), ometotone, ometote ton-methyl, parathion, parathion-methyl, PAP (phenthoate), horate, phosalone, phosmet, phosphoxim (phosphoxim) ), Pirimiphos-methyl, profenophos, propethamphos, prothiophos, pyraclophos, pyraclophos, pyridafenthion, pyridafenthion , Temefos, terbufos, thiomethon, triazophos, DEP (trichlorphon), bamidothion, Bayer 22/190 (chlorthion) bromfenvinfos, bromophos, bromophos-ethyl, butatiofos, carbophenothion, chlorphoxim (Chlorphophos), chlorphoxim (Chlorphophos), chlorphoxim (Chlorphophos) (Temrachlorvinphos), propaphos, mesulfenfos, dioxabenzophos, etrimphos, oxydeprophos, oxidephos, oxydephos Organic phosphorus compounds such as isazofos, imicyafos (AKD3088), isamidofos, thionazin, fostietan; phosphocarb, ara. Oxim carbamate compounds such as nicarb, butocarcboxim, butoxycarboxym, thiodicarb, thiofanox; aldicarb (aldicarb), aldicarb (aldicarb), aldicarb (aldicarb), and aldicarb (aldicarb). Benfuracarb, NAC (carbaryl), carbofuran, carbosulfan, ethiofencarb, BPMC (phenobucarb, fenobucarb, forrmate) isoprocarb)), methiocarb, mesomyll, oxamyl, pyrimicarb, PHC (propoxur), trimetacarb, rimeccarb, XMC3, 5-. ), Aldoxycarb, bufencarb, butacarb, carbanolate, MTMC (metolcarb), MPMC (xylylcarb, phenocalb), phenocalb (Bendiocarb) and other carbamate compounds; acetamiprid, clothianidin, dinotefuran, imidacloprid, imidacloprid, nitenpyram, nitenpyram, thiaclyram, thiaclyram. A diacylhydrazine compound such as chromafenozide, halovenozide, methoxyphenozide, tebufenozide, bistriflulone (bisto). rifluron), chlorfluazuron, diflubenzuron, flucycloxuron, fluphenoxuron, hexaflumuron, hexafluuron, lufenuron, lufenuron, lufenuron, lufenuron Benoylurea compounds such as noviflumuron, teflubenzaron, triflumuron; phenoxycarb, hydroprene, quinoprene, quinoprene, mesoprene, mesoprene, mesoprene, mesoprene Young hormonal compounds; cyclodiene organic chlorine compounds such as chlordane, endosulfan, lindane (gamma-HCH), dienochlor; Cartaphydrocryloclyc 2-Dimethylaminopropane-1,3-dithiol-based compounds; amidin-based compounds such as amitraz; phenylpyrazole-based compounds such as ethiprole, fipronil, and acetoprole; azocyclotin. ), Cyhexatin, organic tin compounds such as fenbutatin oxide (fenbutatin oxide); fenazaquin, fenpyroximate, pyridaben, pyrimidiphen (pyridaben), pyrimidiphen (pyrimidiphen) , METI compounds such as tolfempyrad; benzylate compounds such as bromopropylate; allylpyrrole compounds such as chlorfenapyr; DNOC, binapacryl; dinapacryl, etc. Anthranil-diamide compounds such as chlorantraniliprole, cyantraniliprole; oxadiazine compounds such as indoxacarb; semicarbazone compounds such as metaflumizone, spicarbazone compounds. Tetronic acid compounds such as mesifen and spirotetramat; carbamoyltriazole compounds such as triazamate; tetrazine compounds such as diflovidazin;
Abamectin, emamectin benzoate, milbemectin, lepimeticin, acequinocyl, acequinocyl, azadirachtin, azadirachtin, azadirachtin, azadirachtin, azadirachtin , Buprofezin, CGA-50439, quinomethionat, clofenthezine, cryolite, cyromazine, dyromazine, dazomet, DCIPond, DCIPd DD (1,3-dichloropropene), dicophor, dicofol, dicyclanil, dinobuton, dinocap, ENT 8184, ethoxyzoloid, flozol. ), Fluacrypyrim, flubendiamide, GY-81 (peroxocarbonate), hexithiazox, hydramethylnon, methyliodide (methyliocyand) (Verbutin), metam, methoxychlor, methyl isothiocyanate, pentachlorophenol, phosphine, piperonyl butoxide (piperonyl) complex, piperonyl butoxide (piperonyl) (Propargitte), pymetrosine, pyrethrins, pyridalyl, rotenone, S421 (bis (2,3,3,3-tetrachloropropyl) ether), sabadilla , Spinosad (Spinosad), spinetoram, sulcofluone salt (sulcofuron-sodium), sulfluramid, tetradiphon, thiosultap, thiosultap, tribuphos ), Amidothioate, Aminocarb, Amiton, Aramite, Athidathion, Azotoate, Polysulfidebarium (barium polysulphide) ), 5- (1,3-benzodioxol-5-yl) -3-hexylcyclohexa-2-enone, 1,1-bis (4-chlorophenyl) -2-ethoxyethanol, butonate, Butopyronoxyl, 2- (2-butoxyethoxy) ethyl thiocyanate, camphechlor, chlorbenside, chlordecone, chlordecone, chlordimeform (chlordimeform) Isoprothiolane, fluazuron, metalaldehyde, phenisobromolate, fluazinum, bialaphos, bialaphos, benomil, benomil, benomil Cyflumetofen, amidoflumet, IKA-2005, cyenopyrafen (NC512), sulfoxaflor, pyraflupro (pyrafluprole) (V3039) yril), flupyrazofos, diofenolan, chlorobenzilate, flufenzine, benzomate, benzomate, flufenerim, flufenerim, Triplen (Oxibendazole), fenbendazole (fenbendazole), metam-sodium, 1,3-dichloropropene (1,3-dichloropropene), flupyrazifurone, flupyrazifurone, afidopyropen, afidopyropen Insecticides, acaricides or nematodes such as (pyflubude), fluensulfone), IKI-3106 and the like can be mentioned.

The drug damage reducing agent to be treated at the same time is not limited to these, and for example, benoxacor, furilazole, dicholmid, dicyclonon, DKA-24 (N1, N2-). Dialyl-N2-dichloroacetylglycinamide), AD-67 (4-dichloroacetyl-1-oxa-4-azaspiro [4.5] decane), PPG-1292 (2,2-dichloro-N- (1,3) -Dioxane-2-ylmethyl) -N- (2-propenyl) acetamide), R-29148 (3-dichloroacetyl-2,2,5-trimethyl-1,3-oxazolidine), cloquintoset-mexyl (cloquintcet-) mexyl), naphthalic anhydride (1,8-Naphthalic Acetyl), mefenpyr-diethyl, mefenpyr, mefenpyr-ethyl, fenchlorazole-ethyl. , Acetyl, MG-191 (2-dichloromethyl-2-methyl-1,3-dioxane), cyometrinil, flurazole, fluxofenim, isoxadiphen, isoxadiphen- Examples thereof include isoxydifen-ethyl, daimuron, oxabetarinil, cyprosulfamide lower alkyl substituted benzoic acid, cumyllon or TI-35 (1-dichloroacetylazepan). One or more can be used in combination.

Examples of the plant growth agent to be treated at the same time include maleic acid hydrazide or a salt thereof, abscisic acid, calcium peroxide, inabenfide, paclobutrazol, uniconazole, triapentenol, psychocell and the like.
As described above, the iron-coated seed preparation obtained by subjecting to the drying step and evaporating the water on the seed surface to stop the oxidation reaction is based on the method for preserving crop seeds used as a raw material. It can be saved in the usual way. For example, it can be spread flat on a seedling box and stored in a nursery shelf, a container for transporting seedlings, etc. so that heat does not accumulate. Of course, the seed preparation can also be stored in a degassed sealed container, a sealed package, or a sealed container substituted with nitrogen, for example, so as not to be affected by air oxidation.

Next, a weed control method using a seed preparation with an iron coating, which is the third invention of the present application, will be described.
The iron-coated seed preparation treated with the herbicidal composition of the present invention can be sown by a general cultivation method according to the type of crop, as with untreated seeds. Since the herbicidal composition has been treated, it is usually not necessary to spray other herbicides, but the growing condition of the crop can be confirmed and used in combination with other herbicides as needed. The seed preparation can be sown on flooded land even on the soil surface. In particular, paddy rice seeds may be sown on the surface of a paddy field in a flooded state, or may be sown in a flooded state and then flooded.

Hereinafter, a formulation example of the herbicidal composition used in the present invention and a test example of weed control will be shown and specifically described, but the present invention is not limited thereto. In the following pharmaceutical example, "%" indicates mass%.

Pharmaceutical example 1
Pyrazolate drug substance (purity 93.7%) (64.0 parts by mass), Neucor ^TM 291PG (manufactured by Nippon Emulsifier Co., Ltd., 1.0 parts by mass), KP-1436 (dispersant for pesticides; manufactured by Kao Co., Ltd., 1.0 part by mass) and tap water (34.0 part by mass) were mixed and wet-ground with Atreiter 1S type (manufactured by Mitsui Metal Mine) to obtain a pyrazolate slurry (agricultural chemical active ingredient amount 60.0%). rice field.

Pharmaceutical example 2
Compound (I) (40.0 parts by mass), Neucor ^TM 291PG (manufactured by Nippon Emulsor Co., Ltd., 1.0 part by mass), KP-1436 (manufactured by Kao Co., Ltd., 1.0 part by mass) and tap water (58). .0 parts by mass) was mixed and wet-ground with Atleter 1S type (manufactured by Mitsui Metal Mine) to obtain compound (I) slurry (agricultural chemical active ingredient amount 40.0%).

Example 1
After soaking 100 g of dried paddy rice seeds (variety: Koshihikari) in water at room temperature for 12 hours, the water was sufficiently drained to obtain moist paddy rice seeds. After putting the whole amount of the wet seeds into a bread mixer (DPZ-01 type manufactured by AS ONE), 8.0 g of the pyrazolate slurry of Pharmaceutical Example 1 was treated while rotating the bread at the speed at which the seeds flowed. Next, 77 g of a mixture of iron powder and gypsum (mixing ratio 10: 1) was put into a pan while adding about 8 g of tap water to coat the seeds, and the mixture of iron powder and gypsum was uniformly powdered on the seeds. After being dressed, 3.5 g of grilled gypsum was further added and powdered. The obtained seeds were dried at room temperature for 7 days to stop the oxidation reaction of the treated iron powder to obtain an iron-coated seed preparation coated with pyrazolate. Here, the powder coating means that each of the above-mentioned components is adhered to the seed surface in the form of powder.

Example 2
After soaking 100 g of dried paddy rice seeds (variety: Koshihikari) in water at room temperature for 12 hours, the water was sufficiently drained to obtain moist paddy rice seeds. After putting the whole amount of this wet seed into a bread mixer (DPZ-01 type manufactured by ASONE), 8.0 g of the pyrazolate slurry of Formulation Example 1 and a mixture of iron powder and roasted gypsum (mixture) while rotating the bread at the speed at which the seeds flow. Ratio 10: 1) Alternately, 1/10 amount of 77 g was put into bread while adding about 8 g of tap water, and the seeds were powdered, and finally 3.5 g of roasted gypsum was further added and powdered. The obtained seeds were dried at room temperature for 5 days to stop the oxidation reaction of the treated iron powder to obtain an iron-coated seed preparation coated with pyrazolate.

Example 3
After soaking 100 g of dried paddy rice seeds (variety: Koshihikari) in water at room temperature for 12 hours, the water was sufficiently drained to obtain moist paddy rice seeds. After putting the whole amount of this wet seed into a bread mixer (DPZ-01 type manufactured by ASONE), while rotating the bread at the speed at which the seeds flow, a mixture of iron powder and roasted gypsum is dripped with a pipette of about 8 g of tap water. (Mixing ratio 10: 1) was put into a 77 g bread and the seeds were powdered. After the mixture of iron powder and gypsum was uniformly coated on the seeds, 3.5 g of gypsum was further added. The process of hydrating the obtained seeds at room temperature and drying the seeds was repeated for about 7 days. Oxidation of the obtained iron-coated seeds had not stopped yet, and heat was generated under the conditions of normal temperature and 50% relative humidity. The entire amount of the seeds was placed in a plastic bag, 8 g of the pyrazolate slurry of Formulation Example 1 was added, and the mixture was piston-mixed to obtain an iron-coated seed preparation coated with pyrazolate.

Example 4
An iron-coated seed preparation coated with the compound (I) in the same manner as in Example 1 except that 1.92 g of the compound (I) slurry of the preparation example 2 was treated instead of the pyrazolate slurry of the preparation example 1 of the example 1. Got

Comparative Example 1
After soaking 100 g of dried paddy rice seeds (variety: Koshihikari) in water at room temperature for 12 hours, wet paddy rice seeds that were sufficiently drained were obtained. After putting the whole amount of this wet seed into a bread mixer (DPZ-01 type manufactured by ASONE), a mixture of iron powder and roasted gypsum (mixing) while rotating the bread at the speed at which the seeds flow and dropping 8 g of tap water with a pipette. The ratio 10: 1) was put into a 77 g bread and the seeds were powdered. After the mixture of iron powder and gypsum was uniformly coated on the seeds, 3.5 g of gypsum was further added. The obtained seeds were dried at room temperature for about 3 days without hydration to promote oxidation. The obtained iron-coated seeds did not generate heat under the conditions of normal temperature and 50% relative humidity, and oxidation was stopped. The entire amount of the seeds was placed in a plastic bag, 8 g of the pyrazolate slurry of Formulation Example 1 was added, and the mixture was piston-mixed to obtain an iron-coated seed preparation coated with pyrazolate.

Comparative Example 2
An iron-coated seed preparation coated with compound (I) in the same manner as in Comparative Example 1 except that 1.92 g of the compound (I) slurry of Preparation Example 2 was treated instead of the pyrazolate slurry of Preparation Example 1 of Comparative Example 1. Got

Test Example 1 Elution test of pyrazolate After adding water to a container having a surface area of 900 cm ² so as to have a water depth of 4 cm, the iron-coated seed preparations of Examples 1 to 3 and Comparative Example 1 were treated at 4 places by 5 seeds each. After a lapse of a predetermined time, the rice field water located 1 cm below the water surface was collected, and the concentration of the herbicidal active component in the water (DTP [4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5, which is the active body of pyrazolate] -Amount of hydroxypyrazole] (ppm) was measured by liquid chromatography. The results are shown in Table 1.

The iron-coated seed preparations of Examples 1 to 3 of the present invention were found to have higher DTP elution than the iron-coated seed preparations of Comparative Example 1.

Test Example 2 Dissolution test of compound (I) Fill a pot of 100 cm ² with paddy soil, add water to a depth of 4 cm, and then add 5 iron-coated seed preparations of Example 4 and Comparative Example 2 at 4 locations. Processed to. After a lapse of a predetermined time, the rice field water at a position 1 cm below the water surface was collected, and the concentration (ppm) of the herbicidal active component in the water was measured by liquid chromatography. The results are shown in Table 2.

The iron-coated seed preparation of Example 4 of the present invention was found to have a higher elution of compound (I) than the iron-coated seed preparation of Comparative Example 2, especially in the early stage after treatment.

Test Example 3 Medicinal efficacy / phytotoxicity test A pot of 800 cm ² was filled with paddy soil, and after scratching, seeds of Scirpus juncoides, Pontederia vaginalis and Lindernia procumbens were sown and mixed into the surface layer of the soil. The iron-coated seed preparations of Examples 1 to 4 and the iron-coated seed preparations of Comparative Examples 1 and 2 were sown on the soil surface in four places with 5 seeds each in a flooded state at a depth of 1 cm. Twenty days after sowing, the growth inhibitory effect was determined according to the following criteria. The results are shown in Table 3.
Criteria 0: Growth suppression rate 0-9%
1: Growth suppression rate 10-18%
2: Growth suppression rate 19-27%
3: Growth suppression rate 28-36%
4: Growth suppression rate 37-45%
5: Growth suppression rate 46-54%
6: Growth suppression rate 55-63%
7: Growth suppression rate 64-72%
8: Growth suppression rate 73-81%
9: Growth suppression rate 82-90%
10: Growth suppression rate 91-100%

Test Example 4 Medicinal efficacy / phytotoxicity test After scratching in a paddy field, a 50 cm × 50 cm resin frame was installed, and seeds of Scirpus juncoides, Pontederia vaginalis and Lindernia procumbens were sown and mixed into the surface layer of the soil. The iron-coated seed preparations of Examples 1 to 4 and the iron-coated seed preparations of Comparative Examples 1 and 2 were sown at 12 places on the soil surface in a flooded state at a depth of 3 cm. On the other hand, iron-coated seeds that had not been treated with chemicals were similarly sown, and the phytotoxicity was compared with the group treated with a standard amount of Sunbird ^(R) granules (pyrazolate 10%). Twenty days after sowing, the growth inhibitory effect was determined according to the above criteria. The results are shown in Table 4.

As is clear from Test Examples 3 to 4, weed control was achieved by sowing the iron-coated seed preparation of the present invention on the soil surface of the paddy field. In addition, the degree of growth suppression of paddy rice was significantly lower than that of the various weeds tested, indicating high safety for paddy rice.

The method for producing an iron-coated seed preparation and the method for controlling weeds using the produced iron-coated seed preparation of the present invention can be used in paddy rice cultivation, achieving labor saving in spraying herbicides and controlling important weeds. Moreover, it is an excellent invention because it does not cause any chemical damage to paddy rice.

Claims (15)

1) The process of processing iron powder on seeds,
2) The step of treating the seed with a herbicidal composition and 3) the step of stopping the oxidation reaction of the treated iron powder by appropriately repeating water supply to the seed and drying of the water-supplied seed are included.
Before the step 3), the steps 1) and 2) are carried out, and in the step 3), in the step 2) before the oxidation reaction of the iron powder coated on the seeds is stopped in the step 1) . An iron-coated seed preparation comprising seeds, iron powder and a herbicidal composition, which is obtained by a method for producing an iron-coated seed preparation, which comprises completing a seed treatment with a herbicidal composition. The iron-coated seed preparation according to claim 1, wherein in step 3), water is supplied to the seeds and the water-supplied seeds are dried for at least 3 days. The iron-coated seed preparation according to claim 1 or 2, wherein 2) the step of treating the seed with the herbicidal composition is carried out, and then 1) the step of treating the seed with iron powder is carried out. 1) After performing the step of treating the seeds with iron powder, before the oxidation reaction of the iron powder is stopped,
2) The iron-coated seed preparation according to claim 1 or 2, wherein the step of treating the seed with a herbicidal composition is carried out. The iron-coated seed preparation according to claim 1 or 2, wherein 1) the step of treating the seed with iron powder and 2) the step of treating the seed with the herbicidal composition are carried out at the same time. The active ingredient of the herbicidal composition is at least one herbicidal compound selected from the group consisting of (A1) a bleaching herbicidal compound or a salt thereof and (A2) an acetactate synthase-inhibiting herbicidal compound or a salt thereof. The iron-coated seed preparation according to any one of claims 1 to 5, which comprises. (A1) Whitening-type herbicidal compounds include pyrazole-based herbicidal compounds or salts thereof, triketone-based herbicidal compounds or salts thereof, and 6-chloro-3- (2-cyclopropyl-6-methylphenoxy) pyridazine-4-yl. The iron-coated seed preparation according to claim 6, which is at least one selected from the group consisting of morpholine-4-carboxylate or a salt thereof. (A2) The invention according to claim 6, wherein the acetactate synthase-inhibiting herbicidal compound is at least one selected from the group consisting of a sulfonylurea herbicidal compound or a salt thereof and a pyrimidinyl salicylic acid herbicidal compound or a salt thereof. Iron-coated seed preparation. (A1) At least one whitening herbicidal compound selected from the group consisting of pyrazolate and 6-chloro-3- (2-cyclopropyl-6-methylphenoxy) pyridazine-4-ylmorpholine-4-carboxylate. The iron-coated seed preparation according to claim 6 or 7, which is a seed. (A1) The iron-coated seed preparation according to claim 6, 7 or 9, wherein the bleaching herbicidal compound is pyrazolate. (A2) The iron-coated seed preparation according to claim 6 or 8, wherein the acetactate synthase-inhibiting herbicidal compound is a sulfonylurea herbicidal compound. In the step of treating the seed with the herbicidal composition, in addition to treating the seed with the herbicidal composition, at least selected from the group consisting of an insecticidal composition, a bactericidal composition and a plant growth agent for the seed. The iron-coated seed preparation according to any one of claims 1 to 11, wherein the iron-coated seed preparation according to any one of claims 1 to 11 is treated. The iron-coated seed preparation according to any one of claims 1 to 12, wherein the seed is a paddy rice seed. A weed control method comprising seeding the iron-coated seed preparation according to any one of claims 1 to 13 on the soil surface. A weed control method comprising seeding the iron-coated seed preparation of claim 13 on the surface of paddy soil.