JP6837335B2 - 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 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 rapidly become widespread 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. Since the cultivation period of direct-sown paddy rice cultivation is longer than that of transplanted paddy rice cultivation, it is necessary to control weeds 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 saving labor in spraying pesticides 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 rice field water, a high level of formulation technology such as selection of an appropriate wetting agent and dispersant is required (Patent Document 7).

As a typical example, a weed control method using a plant seed treated with a herbicide is 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 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 ingredient) or herbicide preparation], a surfactant and an inorganic auxiliary agent is applied to the surface of rice paddy seeds. It is manufactured by forcibly drying or air-drying after coating 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.

JP-A-2009-249358 WO01 / 13722 Japanese Patent Application Laid-Open No. 2011-510957 Japanese Unexamined Patent Publication No. 2005-192458 Japanese Unexamined Patent Publication No. 2014-070033 Japanese Unexamined Patent Publication No. 2015-139390 Patent No. 3781487 Japanese Unexamined Patent Publication No. 8-275620

Iron coating flooded direct sowing manual 2010 (National Agriculture and Food 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 seeds themselves are treated to exert their potency, such as fungicides, insecticides, 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 a disease resistance inducer. 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 herbicides, 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 solutions of the examples. Furthermore, the herbicide-coated rice 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 gravity 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. The agents used for seed treatment have been limited to fungicides, pesticides and plant growth agents, which 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 no such technique has been specifically used to date. unknown. Further, when the herbicidal composition is treated on seeds, it is required that the chemical 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 herbicide is present in a high concentration in the vicinity of the seeds, the occurrence of phytotoxicity on 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 of treating a herbicidal composition on seeds by iron coating, which secures the concentration of a necessary amount of pesticide component for a necessary 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 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 was herbicided as compared with a seed preparation obtained by treating the completed iron-coated seed with the herbicidal composition after the oxidation reaction was stopped. Completed the present invention by finding that the diffusion of the herbicide component in water is remarkably improved, practical herbicidal performance can be obtained, and that the herbicide component does not cause any chemical damage to 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) Including a step of treating the seed with a herbicidal composition and 3) a step of stopping the oxidation reaction of the treated iron powder.
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) carrying out the step of treating the seeds with a herbicidal composition, according to [1]. Manufacturing method.
[4]
The production method according to [1], wherein 1) a step of treating seeds with iron powder and 2) a step of treating seeds with a herbicidal composition are carried out at the same time.
[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 inhibitory herbicidal compound or a salt thereof. The production method according to any one of [1] to [4].
[6]
(A1) The bleaching herbicidal compound is a pyrazole-based herbicidal compound or a salt thereof, a triketone-based herbicidal compound or a salt 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 morpholin-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 herbicidal compound or a salt thereof and a pyrimidinyl salicylic acid 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-ylmorpholin-4-carboxylate. The production method according to [5] or [6].
[9]
(A1) The production method according to [5], [6] or [8], wherein the whitening 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 a seed with a herbicidal composition, in addition to treating the seed with a 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, which comprises sowing the iron-coated seed preparation of [13] on the soil surface.
[16]
A weed control method, which comprises 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 Water-plantain such as Sagittaria pygmaea, Pontederia vaginalis, and Alisma canaliculus, and in addition, it does not show any problematic chemical damage to seeds. In addition, since the herbicide active ingredient can be treated at the same time as the iron-coated seeds are produced, a part of the herbicide treatment in Honda can be omitted, which can contribute to the reduction of the amount of control work.
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, which is the first invention of the present application, and a seed preparation by iron coating, which is the second invention, will be described.
Unless otherwise specified, the scope of claims of the present application and the terms used in the specification shall be based on definitions generally used in the art.

The seed preparation means a seed that has been formulated with a pesticide composition. Therefore, the seeds treated with the herbicidal composition together with the iron coating are iron-coated seed preparations.

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) Including a step of treating the seed with a herbicidal composition and 3) a step of stopping the oxidation reaction of the treated iron powder.
It is characterized in that steps 1) and 2) are carried out before the 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 powder coating method, a seed coating method, and a seed powdering 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 the 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 the method described in the Iron Coating Flooded Direct Seeding Manual 2010 (National Agriculture and Food Research Organization). More specifically, after soaking the dried seeds at room temperature for 3 to 4 days, excess water is drained, and the seeds are coated with a mixed powder of iron powder and gypsum while adding water. 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. Plaster of Paris, which is optionally used may be any powdered calcium sulfate hemihydrate _{(CaSO 4 · 1 / 2H 2} O), it can be used commercially.
The amount of iron powder used for the treatment is preferably 0.05 to 1.0 parts by weight, more preferably 0.2 to 0.5 parts by weight, based on 1 part by weight of the seeds. The amount of gypsum mixed with iron powder is preferably 1 to 25%, more preferably 5 to 10%, based on 100% of iron powder. The amount of gypsum used for finishing is preferably 0 to 10%, more preferably 0.1 to 5% with respect to 100% of 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 granulating the iron-coated seeds, or the water contained in the herbicidal composition itself or its diluent. To. Further, the oxygen required for the oxidation reaction is supplied from the oxygen contained in the atmosphere of the environment where the iron coating is applied and the water used. It is generally said that the oxidation reaction is stopped when the thickness of the aqueous 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 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 detecting 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, it is necessary to proceed the oxidation until the treated iron powder is oxidized to form iron hydroxide, that is, iron rust, and 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 that, for example, when observing the seed temperature with a non-contact thermometer or the like, no change in the seed temperature is observed under the conditions of room temperature and 50% relative humidity. is there. However, in a state where the formation of iron rust is insufficient, if the coated seeds have a large amount of water, the temperature change may not 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 a 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)). In one aspect, after the seeds have been treated with iron powder (step 1)), the seeds can be treated with a herbicidal composition (step 2) before the oxidation reaction of the iron powder is stopped. As one aspect, 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 becomes 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, roasted gypsum and a herbicidal composition. A method of treating the 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 becomes uniform in appearance.

The herbicidal composition used in the present invention is, for example, bound based on 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 ingredients such as agents, disintegrants, wetting agents, dispersants, thickeners, defoamers, 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, lignin sulfonate, and the like. 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 positive surfactant. Any surfactant such as an ionic surfactant or a 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 alkyl phosphate ester salt, alkyl sulfate ester salt, polyoxyalkylene alkyl ether phosphoric acid ester salt, polyoxyethylene alkyl ether sulfate ester salt, and alkyl aryl. 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, polyoxyalkylenealkylphenol phosphate, polyoxyalkylenealkylphenol sulfate, polyoxyalkylenealkylphenol sulfate, styrylphenol phosphate, styrylphenol phosphate, styrylphenol sulfate, styrylphenol sulfate, Polyoxyalkylene styrylphenol phosphate, polyoxyalkylene styrylphenol phosphate, polyoxyalkylenestyrylphenol sulfate, polyoxyalkylenestyrylphenol sulfate, distyrylphenol phosphate, distyrylphenol phosphate, dystyrylphenol Sulfate, distyrylphenol sulfate, polyoxyalkylene distyrylphenol phosphate, polyoxyalkylene distyrylphenol phosphate, polyoxyalkylene distyrylphenol sulfate, polyoxyalkylene distyrylphenol sulfate, tristyryl Phenolic Phosphate, Tristyrylphenol Phosphate Sulfate, Tristyrylphenol Sulfate, Tristyrylphenol Sulfate, Polyoxyalkylene Tristyrylphenol Sulfate, Polyoxyalkylene Tristyrylphenol Phosphate, Polyoxyalkylene Tristyrylphenol Sulfate Examples thereof include salts, polyoxyalkylene tristyrylphenol sulfates, alkyl succinate sulfonates, dialkyl succinate sulfonates or polyoxyalkylene dialkyl succinate sulfonates, and preferred are alkyl phosphate ester salts, poly. Oxyalkylene alkyl ether sulphate, alkylaryl sulphate, polyoxya Lucylene 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, tristyrylphenol phosphate, tristyrylphenol phosphate ester salt, polyoxyalkylene tristilylphenol phosphate or polyoxyalkylene tristyrylphenol 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, sucrose, polyoxyalkylene alkyl ether, polyoxyethylene alkyl ether, polyoxyalkylene alkylaryl ether, polyoxyalkylene alkylphenol ether, polyoxyalkylene styrylphenol ether, polyoxyalkylene distyryl Examples thereof include phenol ethers and polyoxyalkylene tristylyl phenol ethers, and preferred examples thereof include polyoxyalkylene alkyl ethers, polyoxyethylene alkyl ethers, polyoxyalkylene alkyl aryl ethers, polyoxyalkylene alkyl phenol ethers, and polyoxyalkylene styryl phenol ethers. , Polyoxyalkylene distyrylphenol ether, polyoxyalkylene tristyrylphenol 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 tenside agent used in the herbicidal composition of the present invention include amino acid amphoteric tenside agents such as sodium laurylaminopropionate; betaine amphoteric tensides such as lauryldimethylbetaine, stearyldimethylbetaine, and lauryldihydroxyethylbetaine. Examples thereof include a carboxylate type amphoteric tenside such as a surfactant; a sulfate ester salt type amphoteric tenside; a sulfonate type amphoteric tenside; or a phosphoric acid ester salt type amphoteric tenside.

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 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 0% 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 polymer thickeners such as arabic gum, tragant gum, xanthan gum, guar gum, roast bean gum, casein, alginic acid, cellulosic polysaccharide, 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 nonionic surfactants, etc.), organic polar compound defoamers such as acetylene glycol derivatives; Such mineral oil-based defoamers; silicone resins, silicone resin surfactant-blended products, silicone resin-based defoamers such as silicone resin inorganic powder blended products, and the like can be mentioned.

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. 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-dimethoxy tetrahydrofuran, dimethylolurea, sodium N-methyldithiocarbamate, phenoxyethanol, glyoxal, glutaaldehyde, 1,3,5-tris (2-hydroxyethyl) -1,3,5- Hexahydrotriazine, benzalkonium chloride, phenoxypropanol, tetramethylacetylenediurea, povidoneiodin, potassium sorbate, 2-bromo-2-nitropropane-1,3-diol, thiazolone and the like can be mentioned.

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 it is desirable that the solvent has a flash point of 2nd petroleum or higher. 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, diethylene glycol, triethylene glycol, propylene Glycol, dipropylene glycol, tripropylene glycol, epichlorhydrin, diglycidylate, dioxane, triethyl phosphate, tributyl phosphate, soybean oil, rapeseed oil, sesame oil, rice oil, coconut oil, sunflower oil, succinic acid , 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 pigments, 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 salts thereof, starch or derivatives thereof, microcrystalline cellulose, wood flour, rice bran, bran and rice husks. Examples 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, paraoxybenzoic acid. 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; and 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 and potassium hydroxide; or organic amines such as triethanolamine can be mentioned, preferably inorganic acids, inorganic metals. Salts or hydroxides, more preferably hydrochloric acid, citric acid, succinic acid, sodium hydroxide, potassium hydroxide, sodium carbonate and the like. In addition, the pH adjuster used may be one type or a combination of two or more types.

The herbicidal composition of the present invention can be prepared by known formulation steps such as mixing, granulation, pulverization, and drying, which are used in the production of ordinary pesticide preparations. In addition, 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 seed without impairing the iron coating property on the seed. Although it may contain only the original of, it usually needs to be formulated into an appropriate formulation. Suitable formulation types and methods for formulating the herbicidal composition include the following (1) to (9), and the herbicidal composition is made into fine particles by wet or dry grinding, or is aqueous or aqueous. It needs to be molded so that the seeds can be uniformly coated by dissolving in an oily solvent. However, other formulation types and formulation methods 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) The bulk powder obtained by dry crushing the herbicidal pesticide active ingredient together with an auxiliary ingredient such as a surfactant, if necessary.
(4) An aqueous dispersion obtained by dispersing the raw 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 raw 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) An emulsion obtained by dissolving an active ingredient of a herbicidal pesticide in a non-polar solvent by adding an emulsifier and, if necessary, an auxiliary ingredient such as a surfactant.
(8) Raw powder obtained by dry pulverizing a 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 a variety that is 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 transplanting cultivation.
It is clear to those skilled in the art which varieties of paddy rice seeds are not sensitive to herbicidal compositions, but examples of varieties of paddy rice seeds that are not sensitive to herbicidal compositions include Koshihikari. , Hinohikari, Hitomebore, Akitakomachi, Kinuhikari, Nanatsuboshi, Haenuki, Kirara 397, Masigura, Tsugaru Romance, 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 Journey 79 (Appendix 1)".

As the paddy rice seeds used in the present invention, seeds that can be sown can be used. Further, in the seed preparation by iron coating 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) acetolactate synthase (hereinafter referred to as ALS) inhibitory herbicidal compounds, and (A3) protoporphyrinogen oxidase (hereinafter referred to as PPO). ) Inhibitory herbicidal compounds and (A4) superlong chain fatty acid elongation 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) bleaching herbicidal compound or salt thereof and (A2) ALS-inhibiting herbicidal compound or 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 herbicide compound is a well-known herbicide that whitens and kills weeds. Examples of the bleaching herbicidal compound in the present invention include a pyrazole-based herbicidal compound, a triketone-based herbicidal 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 on pages 844-845, 848-849, and 81 of The Pesticide Manual 13th Edition, respectively. These compounds belong to the F2 group of the HRAC classification system.
Examples of the triketone-based herbicidal active compound include mesotrione, sulcotrione, benzobicyclone, tefryltrione, and bicyclopyrone, which are described in The Pesticide Manual 13th Edition, pp. 631-632, 908-909, and 80, respectively. Has been done. These compounds belong to the F2 group of the HRAC classification system. 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 classification system.
(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 herbicidal compound, a pyrimidinyl salicylate herbicidal compound, and a triazolopyrimidine herbicidal compound. These compounds belong to Group B of the HRAC classification system.

Examples of the sulfonylurea herbicidal compound include azim sulfuron, benzulfuron methyl, cyclosulfamron, halosulfuron methyl, ethoxysulfuron, imazosulfuron, pyrazosulfuron ethyl, chlorimlon ethyl, synosulfuron, metosulfuron methyl, and flusetos. Examples include ruflon, propanollurea, metazosulfone, etc., respectively, 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, flucetosulfuron (CAS No. 412928-75-7), propyrisulfuron (CAS No. 570415-88-2), metazosulfuron (CAS No. 868680-84-6) and the like are also sulfonylurea herbicidal compounds. is there.

Examples of the pyrimidinyl salicylic acid-based herbicidal compound include bispyribac, pyribenzoxim, pyriphthalide, pyrimisulfan, pyrimisulfan, triafamon, etc. , 863-864. Further, pyrimisulfan (CAS No. 221205-90-9), triafamon (CAS No. 874195-61-6) and the like are also pyrimidinyl salicylic acid-based herbicidal compounds.

Triazolopyrimidine-based herbicidal compounds include, for example, penox slam and are 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. PPO-inhibiting herbicidal compounds are, for example, oxadiargyl, oxadiazone, pentoxazone and the like, which are described on pages 725-726, 727-728, 757-758 of The Pesticide Manual 13th Edition, respectively.

(A4) The 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 herbicide 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 formulation 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 formulation 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 phytotoxicity 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, for example, strobilin-based compounds, anilinopyrimidine-based compounds, azole-based compounds, dithiocarbamate-based compounds, phenylcarbamate-based compounds, organic chlorine-based compounds, benzimidazole-based compounds, and the like. Phenylamide compounds, sulfonic acid compounds, copper compounds, isoxazole compounds, organic phosphorus compounds, N-halogenothioalkyl compounds, carboxyanilide compounds, morpholine compounds, organic tin compounds or cyanopyrrole compounds Etc., and can be used alone or in combination of one or more. The insecticide, acaricide, and nematode-killing agent are not limited to these, and for example, pyrethroid compounds, organic phosphorus compounds, oxime-carbamate compounds, carbamate compounds, neonicotinoid compounds, and diacylhydrazine 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, oxadiazine-based compounds, semicarbazones-based compounds, tetronic acid-based compounds, carbamoyltriazole-based compounds, tetrazine-based compounds, etc. Can be used in combination with seeds or more.

Specifically, for example, the following compounds can be mentioned.
That is, azoxystrobin, cresoxim-methyl, trifloxystrobin, metominostrobin, orysastrobin, orysastrobin, pyracrostrobin, pyracrostrobin, pyracrostrobin. ) And other strovirlin compounds; anilinopyrimidine compounds such as mepanipyrim, pyrimethanil, cyprodinil; triadimephon, bitertanol, biterutanol, triflumitol, triflumitol , Compoundozole, penconazole, flusilazole, microbutanil, cyproconazole, cyproconazole, tebuconazol, tebuconazol, tebuconazol, tebuconazol, tebuconazol, tebuconazol ), Fenarimol, imazalyl, epoxyconazole, prothioconazole, ipconazole, pefurazoate compound, pefurazoate, qinomate compound, pefurazoate, etc. Dithiocarbamate compounds such as maneb, zineb, mancozeb, polycarbamate, provineb, thiram; dietofencarbophenyl, dietofen (Chlorothalonil), organic chlorine compounds such as quintozene; benomyl, thiophanate-methyl, carbendazim (c) Benzimidazole compounds such as arbendazole; metalaxyl, metalaxyl-M, oxadixyl, offrace, benallaxyl, furaxyl, flaxyl, flaxyl, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate, fentin acetate Amid compounds; sulfenoic compounds such as dichlofluand; copper compounds such as cupper hydride, oxine-copper; hydroxyisoxazole and the like. Isoxazole-based compounds; organic phosphorus-based compounds such as fosetyl-aluminium and trolclofos-methyl; N-halogenothioalkyl compounds such as captan, captafol, and folpet. Compounds; dicarboxyimide compounds such as procymidone, iprodione, vinclozolin; flutranil, mepronil, flametopyl, furamethipyr, tifluzamide scyl, tyfluzamidi. (Penthiopyrad), isofetamide, fluopyram, sedaxane, bixafen, penflufen, floxapyroxod, fluxapylozin, isopyrazod, isopyrazod Carboxanilide compounds; morpholine compounds such as fenpropimorph and dimethophorph; organic tin compounds such as triphenyltin hydroxide and fentin acetate; fludioxonyl (Fludioxonil), cyanopyrrole such as fenpiclonil System compounds; Other tricyclazole, pyroquilon, carpropamide, diclocymet, phenoxanil, phenoxanil, futhalide, fluorinyl, fluorinyl, fluorinyl, fluorinyl Pyriphenox, fenpropidin, pencyclon, ferrimzone, cyazofamid, allethrinbrom, allethrinb, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins, allethrins Albesilate (iminotade-albesilate), cyhalothrinamide, casugamycin, validamycin, isoprothiolane, isoprothiolane, streptomycin, streptomycin Bactericides such as probenazole, tiadinil isothianil, tolprocarb, MIF-1002, acrinathrin, allethrin [(1R) -isomer], bifenthrin bioallethrin, bioallethrin S-cyclopentenyl isomer, bioallethrin S-cychloropentenyl isomer, bioallethrin, cycloprothrin, cycloprothrin, cyhalothrin, cyhalothrin, cyhalothrin -Gamma-cyhalothrin, lambda-cyhalothrin, cypermethrin rin), alpha-cypermethrin (alpha-cypermethrin), beta-cypermethrin (beta-cypermethrin), seta-cypermethrin (theta-cypermethrin), zeda-cypermethrin (zeta-cypermethrin), cypermethrin [Cypermethrin [(1R) -trans-isomer]), deltamethrin, empentrin [(EZ)-(1R) -isomer] (empenthrin [(EZ)-(1R) -isomer]), S. Esfenvalate, etofenprox, fenpropathrin, fenvalate, flucythrinate, flumethrin, flumethrin, tau-fluvalate Prox (halfenprox), imiprothrin (imiprothrin), methotrin (methothrin), methoflutrin (methoflutrin), cystermethrin (permethrin), phenothrin [(1R) -trans-isomer] (phenothrin [(1R)) pyrethrin, resmethrin, RU15525 (kadethrin), cypermethrin, tefluthrin, tetramethrin, tetramethrin, tetramethrin [(1R))-iso Tralomethrin, transfluthrin, ZXI8901, biopermethrin, furamethrin, profluthrin, profluthrin, profluthrin, flubrocypermethrin, flubrocypermethrin, etc. Various isomers; acetylate, azamethiphos , Azinphos-methyl, Azinphos-ethyl, cadusafos, chlorethoxyfos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos, chlorpyrifos -Methyl (chlorpyrifos-methyl), kumaphos, CYAP (cyanophos), demeton-S-methyl, diazinon, ECP (diclofenthion) (Dichlorvos)), chlorpyrifos, dimethoate, dimethylvinphos, disulfoton (disulfoton), EPN (O-ethyl O-4-nitrophenylphenylphosphonothioate (O-ethyl O-4-nitrophenylphenylphosphonothioate)) -4-nitropheneyl phenylphosphonothioate), ethion, ethoplophos, famphur, fenamiphos, MEP (pheniphothion), MEP (pheniphothion) (Heptenophos), isofenphos-methyl, Isocarbophos (isopropyl O- (methoxyaminothio = phosphoryl) salicylate), isoxathion, malathion, malathion, mecarbamide, mecarbam , DMTP (methidation), mevinphos, chlorpyrifos, BRP (nared), omethoate, oxydemethone-methion, parathion, parathion. Parathion-methyl, PAP (phenthoate), phorate, phosalone, phosmet, phosphamidon, phoxim (ph)
oxime, pyrimiphos-methyl, prophenofos, propetamphos, prothiophos, pyraclophos, pyraclophos, pyridafenthiphos, pyridafenthiphos ), Temephos, terbufos, thiometon, triazophos, DEP (tricholphon), vamidothion, Bayer 22/190 (chlortion), bayer 22/190 (chlortion) (Bromfenvinfos), bromophos, bromophos-ethyl, butathiophos, carbophenothion, chlorphoxime (Chlorphophos), chlorophoxime (Chlorphophos), chlorphoxime (Chlorphophos), chlorophos (chromphos) Phos (tetrachlorvinphos), propaphos (propaphos), mesulfenphos, dioxabenzophos (dioxabenzophos), etrimphos (etrimphos), oximephophos (oxydephophos) Organophosphorus compounds such as (isazofos), imiciaphos (AKD3088), isamidofos, thionazin, fostietan; phosphocarb, aldicarb, aldicarb, aldicarb. Oxime carbamate compounds such as butoxycarboxim, thiodicarb, and Thiofanox; aldicarb, bentioc arb), benfuracarb, NAC (carbalyl), carbofuran, carbosulfan, etiophencarb, BPMC (phenobukarb), BPMC (phenobukarb) , MIMOC (isoprocarb), methiocarb, methomyl, oxamyl, pyrimicarb, PHC (propoxur, trimethylcarb, trimethacloprid) ), Allyxycarb, aldoxycarb, bufencarb, butacarb, carbanolate, MTMC (metolcycarb), MPMC (xylcarbyl), MPMC ), Carbomate compounds such as bendiocarb; acetamiprid, clothianidin, dinotefuran, imidacloprid, imidacloprid, nitempiromidiacloprid Neonicotinoid compounds; diacylhydrazine compounds such as chromafenozide, halophenozide, methoxyphenozide, tebufenozide, tebufenozide, diacylhydrazine lufenuron, bistrifluluno, bistrifuron ), Flucycloxuron, fluphenoxuron, hexaflumuron, lufenuron, novallon ( Benoylurea compounds such as novaluron, noviflumuron, teflubenzuron, triflumuron; phenoxycarb, phenoxycarb, hydroprene, hypoprene, quinoprene, quinoprene, quinoprene. ), Etc., immature hormonal compounds; cyclodiene organic chlorine compounds such as chlordane, endosulfan, lindane (gamma-HCH), dienochlor; 2-Dimethylaminopropane-1,3-dithiol compounds such as thiocyclam; amidin compounds such as amitraz; phenylpyrazoles such as ethiprole, fipronil, and acetoprole. Compounds; Organic tin compounds such as azocyclotin, cyhexatin, fenbutatin oxide (fenbutatin oxide); fenazaquin, fenpyroxymate, pyridiphenimate, pyridaphenip. , METI compounds such as tebufenpyrad, tolfenpyrad; benzylate compounds such as bromopropylate; allylpyrrol compounds such as chlorphenapyr; allylpyrrol compounds such as chlorphenapyr; allylpyrrol compounds such as chlorphenapyr; Compounds; Anthranil-diamide-based compounds such as chlorantraniliprole and cyantraniliprole; Oxaziazine-based compounds such as indoxacarb; Semi-carbaflumizone and the like. Tetoronic acid compounds such as clofentezine, spiromesifen, and spirotetramat; carbamoyltriazole compounds such as triazamate; tetrazine compounds such as diflobidazine , Emamectin benzoate, milbemectin, repimectin, acequinocyl, azadiractin, azadiractin, benzylatebene, bensultap ), CGA-50439, quinomethionat, clofentezine, cryolite, cyromazine, dazomet, DCIP, DDT, diaphentiuron (diafent) 1,3-Dichloropropene (1,3-Dicholoplone), dicofol, dicyclanil, dinobuton, dinocap, ENT 8184, etoxazol (exoxazoloid), flonicamide, flonicamide. fluacrypyrim), flubendiamide, GY-81 (peroxocarbonate), hexithiazox, hydramethylnon, methyl iodide (methyliodide), carandin (merbiodide), carandin (karandine) Metam, methoxychlor, methyl isothiocyanate, pentachlorophenol, phosfine, piperonyl butoxydone ins), BPPS (propargite), pyretaldehyde, pyrethrins, pyridalyl, rotenone, S421 (bis (2,3,3,3-tetrachloropropyl) ether), Sabadilla, spinosad, spinetoram, sulcofluone salt (sulcofuron-sodium), sulfluramid, sulfluramid, tetradiphon, tetradiphon, tetradiphon, thiosulfon aldrin, amidithion, amidothioate, aminocarb, amiton, aramite, athidathion, athidathion, azotoate, polysulfide, polysulfide, polysulfide Bayer 32394, benclothiaz, 5- (1,3-benzodioxol-5-yl) -3-hexylcyclohex-2-enone, 1,1-bis (4-chlorophenyl) -2-ethoxyethanol , Butonate, butopyronoxyl, 2- (2-butoxyethoxy) ethyl thiocyanate, camphechlor, chlorbenside, chlordecone, chlordecone, chlordecone, chlordecon (chlordecone), chlordecon (chlordecone), chlordecon (chlordecone), chlordecon (chlordecone), chlordecon (chlordecone) Kepone, isoprothiolane, fluazuron, metaldehyde, phenisobromolate, fluazinam, fluazinam, bialaphos, bialaphos , Pyrifluquinazon, cyflumetophen fen), amidoflumet, IKA-2005, cyenopyrafen (NC512), sulfoxaflor, pyrafluprole (V3039), pyriprol Flupyrazofos, diofenolan, chlorobenzilate, flufenzine, benzomate (benzomate), flufenerim, triplobenzalbendazole, triplobenzilate , Fenbendazole, metam-sodium, 1,3-dichloropropene, flupyrradifurone, afidopyropene, afidopyropene, fromofluorene , Fluensulfone), pesticides such as IKI-3106, acaricides or nematodes.

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 (cloquinctet-) mexyl), naphthalic anhydride (1,8-Naphthical Acetyl), mefenpyr-diethyl, mefenpyr, mefenpyr-ethyl, fenchlorazole-ethyl , Acetyl, MG-191 (2-dichloromethyl-2-methyl-1,3-dioxane), cyometrinil, flurazole, fluxophenim, isoxadiphen, isoxadiphen-ethyl. Isoxadiphen-ethyl), daimuron, oxabetrinil, cyprosulfamide lower alkyl-substituted benzoic acid, cumyluron or TI-35 (1-dichloroacetylazepan) and the like can be mentioned. One or more can be used in combination.

Examples of the plant growth agent to be treated at the same time include hydrazide maleate 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, like untreated seeds. Since the herbicide 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 formulation examples, "%" indicates mass%.

Formulation Example 1
Pyrazolate base (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 Corporation, 1.0 part by mass) and tap water (34.0 parts 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%). It was.

Preparation example 2
Compound (I) (40.0 parts by mass), ^{Neucor TM} 291PG (manufactured by Nippon Emulsifier Co., Ltd., 1.0 parts by mass), KP-1436 (manufactured by Kao Corporation, 1.0 parts by mass) and tap water (58). .0 parts by mass) was mixed and wet-ground with Atliter 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 all the wet seeds into a bread mixer (DPZ-01 type manufactured by AS ONE), 8.0 g of the pyrazolate slurry of Formulation 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 state 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 all the wet seeds into a bread mixer (DPZ-01 type manufactured by ASONE), 8.0 g of 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 grilled plaster 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 all the wet seeds into a bread mixer (DPZ-01 type made by ASONE), while rotating the bread at the speed at which the seeds flow, tap water is dropped with a pipette to a mixture of iron powder and roasted gypsum. (Mixing ratio 10: 1) was placed in a 77 g bread and the seeds were powdered. After the seeds were uniformly coated with a mixture of iron powder and gypsum, 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 whole amount of the seeds was placed in a plastic bag, 8 g of the pyrazolate slurry of Formulation Example 1 was added, and the seeds were mixed by a piston to obtain an iron-coated seed preparation coated with pyrazolate.

Example 4
An iron-coated seed preparation coated with compound (I) in the same manner as in 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 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 all the wet seeds into a bread mixer (DPZ-01 type manufactured by ASONE), a mixture of iron powder and roasted gypsum (mixture) while rotating the bread at the speed at which the seeds flow and dropping 8 g of tap water with a pipette. A ratio of 10: 1) was placed in a 77 g bread and the seeds were powdered. After the seeds were uniformly coated with a mixture of iron powder and gypsum, 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 seeds were mixed by a piston 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 in 4 places by 5 seeds each. After a lapse of a predetermined time, the surface water 1 cm below the surface of the water was collected, and the concentration of the herbicidal active ingredient in the water (DTP [4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5, which is the active body of pyrazolate) -Hydroxypyrazole] (ppm) was measured by liquid chromatography. The results are shown in Table 1.

Higher DTP elution was observed in the iron-coated seed preparations of Examples 1 to 3 of the present invention as compared with 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 apply 5 iron-coated seed preparations of Example 4 and Comparative Example 2 to 4 places. Processed to. After a lapse of a predetermined time, the surface 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 effect / 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 a flooded state at a depth of 1 cm at 4 locations. 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 effect / 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 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 sown in the same manner, and the medicinal 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 a paddy field. In addition, the degree of growth suppression of paddy rice was remarkably low compared to the various weeds tested, demonstrating high safety for paddy rice.

The method for producing an iron-coated seed preparation of the present invention and the method for controlling weeds using the prepared iron-coated seed preparation 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 (13)

1) The process of processing iron powder on seeds,
It includes a step of treating the seed with a herbicidal composition and a 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.
Before the step 3), the steps 1) and 2) were carried out, and in the step 3), before the oxidation reaction of the iron powder coated on the seed containing the obtained herbicidal composition was stopped. A method for producing an iron-coated seed preparation, which comprises completing a seed process. The method for producing an 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 production method according to claim 1 or 2, wherein 1) the step of treating the seed with iron powder is carried out after carrying out the step of treating the seed with the herbicidal composition. 1) After performing the step of treating the seeds with iron powder, before the oxidation reaction of the iron powder stops.
2) The production method according to claim 1 or 2, wherein a step of treating the seed with a herbicidal composition is carried out. The production method according to claim 1 or 2, wherein 1) a step of treating the seeds with iron powder and 2) a step of treating the seeds with a 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 inhibitory herbicidal compound or a salt thereof. The production method according to any one of claims 1 to 5, which comprises. (A1) The bleaching herbicidal compound is a pyrazole-based herbicidal compound or a salt thereof, a triketone-based herbicidal compound or a salt thereof, and 6-chloro-3- (2-cyclopropyl-6-methylphenoxy) pyridazine-4-yl. The production method according to claim 6, which is at least one selected from the group consisting of morpholin-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 herbic acid compound or a salt thereof. How to make. (A1) At least one whitening herbicidal compound selected from the group consisting of pyrazolate and 6-chloro-3- (2-cyclopropyl-6-methylphenoxy) pyridazine-4-ylmorpholin-4-carboxylate. The production method according to claim 6 or 7, which is a seed. (A1) The production method according to claim 6, 7 or 9, wherein the whitening herbicidal compound is pyrazolate. (A2) The production method 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 production method according to any one of claims 1 to 11, wherein one kind is processed. The production method according to any one of claims 1 to 12, wherein the seed is a paddy rice seed.