JP4551639B2 - Weeding method by nursery box application and nursery box application preparation - Google Patents

Description

  The present invention relates to a weeding method by application of a seedling box and a preparation for application of a seedling box. More specifically, the present invention relates to a method for spraying a herbicidal composition on a seedling box before transplanting paddy rice seedlings to control weeds generated in the rice field after transplanting, and a preparation used for the method.

As a method for controlling weeds in transplanted paddy rice fields, a method characterized by spraying a composition containing a herbicide having a water solubility of 0.5 ppm or more at 15 ° C. to a paddy rice seedling box before transplanting and mechanically transplanting Is known (see Patent Document 1).
Also known is a method of weeding transplanted rice fields, characterized in that a granular herbicide as a specific herbicidal active ingredient is uniformly sprayed on a nursery bed immediately before transplanting, and the granular agent absorbs water and swells and then mechanically transplants. (See Patent Document 2).
JP-A-8-188507 JP 54-67028 A

Weed control in transplanted paddy rice fields is extremely important for the growth of paddy rice, and how to suppress the occurrence of weeds from the viewpoint of the work efficiency of weed control is also extremely important and interesting for paddy rice producers. is there.
Conventionally, as a means of controlling paddy rice weeds, spraying herbicides to Honda before or after weeds emerged was all. In order to improve work efficiency and reduce work labor, new development of treatment drug dosage forms, reduction of the amount of treatment chemicals per unit area, reduction of the number of treatments, and simultaneous treatment of drugs and transplants However, all of these were limited to improvements related to Honda application.

  As a result of repeated studies to develop a new method for controlling weeds that can be put into practical use and to significantly improve work efficiency and reduction of work labor, the present inventors have identified the following method and therefore: Thus, the present invention was completed.

  Thus, according to the present invention, the apparent specific gravity is less than 1, the herbicidal active compound and the polyoxyethylene alkyl ether sulfate are contained, and if necessary, the particle size including the adjuvant is about 3 mm to about 10 mm. Any one of an extruded granule, a foamed tablet having a diameter of about 6 mm to about 20 mm and a height of about 5 mm to about 40 mm, or a capsule having a diameter of about 5 mm to about 20 mm and a length of about 5 mm to about 30 mm A method of controlling Honda weeds after transplanting, characterized by spraying the agent on a seedling box before transplanting rice seedlings, and having an apparent specific gravity of less than 1, containing a herbicidal active compound and polyoxyethylene alkyl ether sulfate, Further, if necessary, an extruded granule having a particle size of about 3 mm to about 10 mm containing an auxiliary agent, an expanded tablet having a diameter of about 6 mm to about 20 mm and a height of about 5 mm to about 40 mm Has nursery box application preparation is any one of the agents of the capsules is about 5mm~ about 30mm diameter length of about 5mm~ about 20mm is provided.

  Surprisingly, the use of such a herbicidal method and the preparation of the present invention enables the application (treatment) of a herbicidal active composition in a rice seedling raising stage, which has heretofore been impossible in practice, and It is possible to suppress the occurrence of weeds after transplanting to Honda, and the phytotoxicity to paddy rice can be accurately suppressed within an acceptable range.

  As is apparent from the results of the following Examples, the method of the present invention and the preparation used in the method enable the herbicidal active composition to be applied to a seedling box, and work effectively for weed control after transplanting to Honda, and at the same time against paddy rice. The chemical damage was suppressed to an acceptable level.

The herbicidal active compound used in the present invention is preferably a solid at room temperature, and is not particularly limited as long as it is a herbicidal active compound for paddy rice, but preferred examples include the following (generic name) Description).
2,4-PA-ethyl, ACN, SAP, azimusulfuron, imazosulfuron, indanophan, esprocarb, ethoxysulfuron, etobenzanide, oxadiclomephone, caffentrol, cumyluron, clomeprop, cyclosulfamuron, sinosulfuron, cihalohopbutyl, dimetamethrin, cimethrin , Dimethylpiperate, dimelon, tenylchlor, naproanilide, halosulfuronmethyl, biphenox, piperophos, pyrazoxifene, pyrazosulfuronethyl, pyrazolate, pyributycarb, pyriminobacmethyl, phentolazamide, butamifos, pretilachlor, bromobutide, bensulfuron methyl, benzobicyclone, Fenap, bentazone, bentazone sodium salt, bench oka Breakfast, Pentoxazone, benfuresate, mefenacet, such as molinate and anilofos.

As a foaming agent used for an effervescent tablet, it can use by the combination of carbonate and an acid, The following can be illustrated as each specific example.
Carbonate: Sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, sodium sesquicarbonate and the like.
Acid: Citric acid, succinic acid, malonic acid, oxalic acid, tartaric acid, maleic anhydride, phthalic acid, malic acid, kultaric acid, adipic acid, aluminum sulfate, etc.

  Further, examples of the auxiliary agent include solid surfactants and binders used for general granules, and other surfactants in addition to the essential surfactants of the present invention. Examples of the solid carrier include mineral fine powder (for example, kaolin, clay, talc, bentonite, diatomaceous earth, calcium carbonate, white carbon), inorganic salts such as potassium chloride, and organic substances such as wood powder. Examples of the binder include dextrin, carboxymethyl cellulose, natural polymers (for example, gum arabic), synthetic polymers (for example, polyvinyl alcohol, polyvinyl acetate, etc.), and the like.

  Other surfactants include polyethylene glycol higher fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene aryl phenyl ethers, sorbitan monoalkylates, acetylene alcohols and acetylenic diols and their alkylene oxides. Nonionic surfactants such as adducts, alkylaryl sulfonates, dialkyl sulfonates, lignin sulfonates, naphthalene sulfonates and their condensates, alkyl sulfates, alkyl phosphates, alkylaryl sulfates , Alkylaryl phosphate ester salt, polyoxyethylene alkyl ether sulfate ester salt, polyoxyethylene alkyl aryl ether sulfate ester salt, Carboxymethyl ethylene aryl phenyl ether sulfuric acid ester salts, polycarboxylic acid type polymer, an anionic surfactant such as a dialkyl sulfosuccinate salt, more can be mentioned silicone-based surfactants, and so fluorosurfactant.

The granule and the effervescent tablet used in the present invention can exhibit a further effect by having floatability, preferably in the rice field water of Honda.
In order to provide such floating properties, the granules and effervescent tablets used in the present invention can contain effervescent pearlite, effervescent shirasu, plastic hollow bodies, and the like.

  The blending ratio of each component in the extruded granule, effervescent tablet or capsule used in the present invention can vary over a substantially wide range. And generally from about 1 to about 20% by weight of the herbicidal active compound, preferably from about 3 to about 15% by weight, and from about 2 to about 7% by weight of polyoxyethylene alkyl ether sulfate, preferably by weight% in the formulation. From about 3 to about 5% by weight, and other adjuncts can be included in the balance.

  The extruded granules used in the present invention have a particle size in the range of about 3 mm to about 10 mm, preferably about 3 mm to about 9 mm, and the effervescent tablet also has a diameter of about 6 mm to about 20 mm, preferably about 6 mm to about 9 mm. 9 mm, the height is about 5 mm to about 40 mm, preferably about 10 mm to about 15 mm, and the capsule is also about 5 mm to about 20 mm in diameter, preferably about 6 mm to about 15 mm, and about 5 mm in length. To about 30 mm, preferably about 7 mm to about 25 mm.

The extruded granule used in the present invention can be prepared by an ordinary extrusion granulation method. Specifically, for example, the components described above can be kneaded with water and then granulated using an extrusion granulator. The amount of water used in the kneading is not strictly limited, but can be usually 5 to 50%, preferably 15 to 35%, based on the total weight.
Effervescent tablets can be prepared using a normal tableting machine.

Capsules can be easily obtained by filling granular, fine or powdery preparations comprising the constituents according to the invention into capsules based mainly on gelatin, which is very commonly used.
The granular or fine-grained preparation used for the capsule can be obtained according to the above-mentioned extrusion granulation method, and the powdery preparation can be obtained according to the usual method for preparing an agrochemical powder.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In the examples,% indicates% by weight.

(Invention Formulation Example 1)
Fentrazamide raw powder (70.8%) 3.05%
Bensulfuron methyl bulk powder (9.9%) 5.66%
Daimron bulk powder (84.8%) 5.73%
Sodium salt of carboxymethyl cellulose 20.0%
Polycarboxylic acid type anionic surfactant 2.0%
Sodium salt of lignin sulfonic acid 2.0%
Polyoxyethylene alkyl ether sulfate 5.0%
Wood powder residue After the above powder is uniformly mixed using a mixer, 35% by weight of water is added and kneaded, and then granulated using an extrusion granulator equipped with a screen having a diameter of 3.0 mm. After drying, the particles are sized using a sieve having an opening of 2.0 mm to 5.6 mm to obtain extruded granules.

(Invention Formulation Example 2)
A powder having the same structure as in Example 1 is kneaded in the same manner and extruded and granulated with a screen having a diameter of 5.0 mm.

(Invention Formulation Example 3)
Fentrazamide raw powder (70.8%) 3.05%
Bensulfuron methyl bulk powder (9.9%) 5.66%
Daimron bulk powder (84.8%) 5.73%
Plastic hollow body 1.5%
Dialkylsulfosuccinate sodium salt 2.0%
Dextrin 2.0%
Polyoxyethylene alkyl ether sulfate 3.0%
Potassium chloride residue Granules having a diameter of 5.0 mm are obtained in the same manner as in Example 2 above.

(Invention Formulation Example 4)
Fentrazamide raw powder (70.8%) 3.05%
Bensulfuron methyl bulk powder (9.9%) 5.66%
Daimron bulk powder (84.8%) 5.73%
Sodium salt of carboxymethyl cellulose 5.0%
Dialkylsulfosuccinate sodium salt 2.0%
Talc 5.0%
Polyoxyethylene alkyl ether sulfate 3.0%
Citric acid 22.62%
Sodium bicarbonate 29.7%
Wood powder residue After the above powder is uniformly mixed using a mixer, it is tableted using a single tableting machine to obtain an expanded tablet having a diameter of 9 mm.

(Invention Formulation Example 5)
Fentrazamide raw powder (70.8%) 3.05%
Bensulfuron methyl bulk powder (9.9%) 5.66%
Daimron bulk powder (84.8%) 5.73%
Sodium salt of carboxymethyl cellulose 20.0%
Polycarboxylic acid type anionic surfactant 2.0%
Sodium salt of lignin sulfonic acid 2.0%
Polyoxyethylene alkyl ether sulfate 5.0%
Wood powder residue After the above powder is uniformly mixed using a mixer, 20% by weight of water is added and kneaded, and then granulated using an extrusion granulator equipped with a screen having a diameter of 0.5 mm. After drying, the granules are sized using a sieve having an opening of 0.2 mm to 1.0 mm to obtain a granular product.
This granular product is filled into a gelatin capsule having a diameter of 6 mm and a length of 15 mm to obtain a capsule.

Comparative formulation example Fentrazamide powder (70.8%) 3.05%
Bensulfuron methyl bulk powder (9.9%) 5.66%
Daimron bulk powder (84.8%) 5.73%
Polycarboxylic acid type anionic surfactant 1.0%
Dialkylsulfosuccinate sodium salt 0.2%
Enzyme-modified dextrin 1.0%
Polyoxyalkylene aryl phenyl ether sulfate 3.5%
Sodium tripolyphosphate 2.0%
Bentonite 30.0%
Calcium carbonate residue The powder is extruded and granulated in the same manner as in Example 1 using a 0.8 mm screen.

Test example Herbicidal and phytotoxicity test formulation:
Invention formulation 1 (= Example 1 above) Particle size 3 mm granule Invention formulation 2 (= Example 4 above) Effervescent tablet Comparative formulation (= Comparative formulation example) Particle size 0.8 mm granule Method:
Prior to transplanting on the day of rice transplantation, 50 g of the preparation per box was treated in a seedling box (20 boxes per 10 ares). The treated seedlings were mechanically transplanted to Honda, which was about 1 cm in water.
Macroscopic evaluation was performed up to 40 days at 10-day intervals after rice transplanting. In the evaluation of medicinal effects, 0 means no effect and 100% means complete death. Paddy rice chemical damage 10% or less: allowable range.
result:

───────────────────────────────────
Tainubi Tamaga Konagi Broadleaf Firefly Paddy Rice Missing Rice
Effect of effect File damage rate
───────────────────────────────────
Invention formulation 1 100 100 100 97 90 10 0
Box processing
───────────────────────────────────
Invention formulation 2 98 100 100 97 90 9 1
Box processing
───────────────────────────────────
Comparative formulation 100 100 100 97 100 95 40
Box processing
───────────────────────────────────
Comparative preparation 100 100 100 98 100 2 0
Rice planting simultaneously
───────────────────────────────────

Claims (6)

In less than an apparent specific gravity of 1, an antifoaming agent, a herbicidal compound and polyoxyethylene alkyl ether sulfate, a further particle size at which an auxiliary agent is extruded granules of 3 mm to 10 mm, in diameter high in 6mm~20mm A transplant characterized by spraying any one of effervescent tablets having a diameter of 5 mm to 40 mm or capsules having a diameter of 6 mm to 20 mm and a length of 5 mm to 30 mm onto a seedling box before transplanting rice seedlings Later Honda weed control method.   Herbicidal active compounds are 2,4-PA-ethyl, ACN, SAP, azimusulfuron, imazosulfuron, indanophan, esprocarb, ethoxysulfuron, etobenzanide, oxadichromemephone, kafenthrol, cumyllon, chromeprop, cyclosulfamuron, sinosulfuron, cihalohop Butyl, dimetamethrin, cimethrin, dimepiperate, dimrone, tenylchlor, naproanilide, halosulfuronmethyl, biphenox, piperophos, pyrazoxifene, pyrazosulfuronethyl, pyrazolate, pyributicarb, pyriminobacmethyl, phentolazamide, butamiphos, pretilacrol, bromobutyrode Benzobicyclon, benzophenap, bentazone, bentazon natri Unsalted, benthiocarb, pentoxazone, benfuresate, mefenacet, control method according to claim 1 is at least one selected from the group consisting of molinate and anilofos. In less than an apparent specific gravity of 1, contained herbicidally active compound and polyoxyethylene alkyl ether sulfates, further, the nursery box application formulation particle size comprising an auxiliary agent is extruded granules of 3 mm to 10 mm. In less than an apparent specific gravity of 1, contained herbicidally active compound and polyoxyethylene alkyl ether sulfates, further diameter comprising adjuvants height in 6mm~20mm it is effervescent tablets of 5mm~40mm nursery box application Formulation. A seedling box having an apparent specific gravity of less than 1, containing a herbicidal active compound and polyoxyethylene alkyl ether sulfate, and further containing an adjuvant and having a diameter of 6 mm to 20 mm and a length of 5 mm to 30 mm. Application formulation.

Herbicidal active compounds are 2,4-PA-ethyl, ACN, SAP, azimusulfuron, imazosulfuron, indanophan, eprocarb, ethoxysulfuron, etobenzanide, oxadichromemephone, kafenstrol, cumyllon, clomeprop, cyclosulfamuron, sinosulfuron, cihalohop Butyl, dimetamethrin, cimethrin, dimepiperate, dimrone, tenylchlor, naproanilide, halosulfuronmethyl, biphenox, piperophos, pyrazoxifene, pyrazosulfuronethyl, pyrazolate, pyributicarb, pyriminobacmethyl, phentolazamide, butamiphos, pretilacrol, bromobutyrode Benzobicyclon, benzophenap, bentazone, bentazon natri Unsalted, benthiocarb, pentoxazone, benfuresate, mefenacet, nursery box application formulation according to claim 3, 4 or 5 is at least one selected from the group consisting of molinate and anilofos.