JPS5828843B2 - How to reduce chemical damage to paddy rice - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses 3-allyl oxide 2-benziisothiazole-1·■-dioxide (hereinafter referred to as probenazole) to treat rice seedlings during box raising.

) will cause phytotoxicity after transplanting Honda, and this invention relates to a method of reducing phytotoxicity by pre-treating soil for seedling boxes with 4-methylsulfonyloxyphenyl-N-methylthiol carbamate.

With the rapid spread of rice transplanters in rice cultivation in recent years, paddy rice seedlings have come to be raised using box seedlings.

This seedling raising method uses a seedling raising box (length 60C1rL x width 30crf)
The method is to sow the seeds in soil (Lx depth 3cfrL) and then raise the seedlings by germination at high temperatures.If the seedlings can be treated with chemicals during the seedling-raising period to control pests and diseases after transplanting, it will save even more labor in rice cultivation. It is expected that

However, rice seedlings are highly sensitive to chemicals during the seedling-raising period, and not all pesticides can be applied to the seedling boxes.
Drug selection is necessary.

Globenazole, a conventional fungicide, is a well-known compound that is highly effective against rice blast, and is also effective against bacterial leaf blight, and is currently being used to treat rice seedlings grown in boxes.

Unfortunately, however, drug damage may occur with probenazole after Honda transplantation, so there is a strong desire to reduce drug damage after Honda transplantation.

As a result of various studies on reducing the phytotoxicity of probenazole on rice seedlings, the present inventors unexpectedly found that a compound known as a soil fungicide for agriculture and horticulture (Japanese Patent Laid-Open No. 53-4752
By treating the soil before sowing paddy rice with 4-methylsulfonyloxyphenyl-N-methylthiol carbamate (C, hereinafter referred to as compound A), which is a compound (Publication No. 7), the chemical damage caused by probenazole after transplanting Honda to paddy rice is reduced. The present invention was completed by discovering that it is possible to do so.

In the method of the present invention, a seedling raising box (length 601 x width 30C1) is used.
rL x depth 3CrrL) after treating the soil with Compound A, sow rice seeds there, and grow 10 to 2
It is preferable to treat the seedlings with globenazol after raising the seedlings for about 0 days.

In this method, by conventionally treating rice seedlings that are being grown in boxes with probenazole, it is possible to reduce chemical damage, such as yellowing (leaves) of paddy rice or inhibition of growth of paddy rice, that occurs after transplanting to Honda.

Compound A and probenazole used in the present invention are used in various formulations, and in some cases the compound of the present invention may be used alone, but usually they are mixed with a carrier or other auxiliary agent depending on the purpose of use, such as powder, aqueous phase agent, etc. It is used in the form of particle size IL fine granules.

The carrier may be either a solid carrier or a liquid carrier. Examples of the solid carrier include clay, kaolin, talc, diatomaceous earth, silica, calcium carbonate, bentonite, etc., and examples of the liquid carrier include benzene, toluene, xylene, alcohol, acetone, methylnaphthalene, etc. Examples include cyclohexane, paraffin, dimethylformamide, dimethyl sulfoxide, animal and vegetable oils, fatty acids, fatty acid esters, and various surfactants.

Examples of surfactants include anionic surfactants such as higher alcohol sodium sulfate, stearyltrimethylammonium chloride, holoxyethylene alkylphenyl ether, and lauryl betaine, cationic surfactants,
Examples include nonionic surfactants and amphoteric surfactants.

In addition, auxiliary agents other than carriers commonly used in agricultural chemicals, such as spreading agents, emulsifiers, wetting agents, dispersants, fixing*ζ agents, and disintegrants, can be appropriately mixed to ensure the effect.

The processing amount (active ingredient amount) of the drug in the present invention is as follows:
Compound A0.1-5P, Probenazole 2.4 per box
to 42 as appropriate.

Example: A rice seedling box with a length of 60 cnl, a width of 30 c/rL, and a depth of 3 crrL was filled with soil, and Compound A (4-methylsulfonyloxyphenyl-N-methylthiol carbamate) 1 was added.
A powder (active ingredient: 10%) prepared by mixing and pulverizing 0 parts of talc, 41 parts of talc, and 49 parts of clay was added and mixed uniformly into the soil.

Next, add 0.31 rice (variety - Nihonbare) seeds per box.
After sowing and raising seedlings for 15 days using the usual seedling-raising method, they were treated with commercially available Probenazole granules (active ingredient: 8%) on the day of planting 501/box, and 25 days after Honda planting, plant height, fresh weight, and degree of yellowing were investigated. .

The results are shown in Table 1.

Claims (1)

[Claims] When treating paddy rice growing in boxes with 13-allyloxy-1,2-benzisothiazolate l-dioxide, 4-methylsulfonyloxyphenyl-
A method for reducing phytotoxicity of paddy rice, which comprises treating soil with N-methynol 2ol carbamate to reduce the phytotoxicity of the chemical to paddy rice.