JPS6366104A - Agent for reducing injury from salt and phytotoxicity of crop - Google Patents

Abstract

PURPOSE:To obtain an agent for reducing injury from salt and phytotoxicity of crops such as paddy-rice plant, etc., containing an epibrassinolide. CONSTITUTION:In using the titled agent, a compound shown by formula I or formula II (R is H or acetyl group) is diluted with water into an extremely low concentration and used or blended with an agricultural auxiliary such as carrier, spreader, emulsifying agent, dispersant, degrading agent, etc., into dust, granule, wettable powder, flowable agent, emulsion, etc., and can be used. A period for treatment is preferably before use of herbicide or before seeding or transplanting of seed or seedling of paddy-rice plant in paddy fields containing salt. An aqueous solution of an agent for reducing injury from salt and phytotoxicity of crop is impregnated into the seed or the aqueous solution is sprayed upon seedling in seedling raising boxes or the seedling is immersed in the aqueous solution so that height of rice plant suppressed by herbicide and injury from salt and yellowing of leaf color are recovered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to crop salts and phytotoxicity reducing agents that reduce phytotoxicity and salt damage caused by herbicides.

[Problem that the invention seeks to solve]

In recent years, the use of herbicides has become rapidly popular.

It has greatly contributed to increasing food production, and the cultivation of wet rice has particularly benefited from this.

Despite the widespread use of herbicides, the frequency of chemical damage to a single crop is increasing due to lack of proper usage, abnormal weather conditions, use of weak seedlings, etc.

In particular, it has been pointed out that harmful substances such as bentiocarb, plathioclor, butachlor, and cymetrine, which are widely used, are harmful to crops.

In addition, in rice paddies near the coast, salt damage has caused problems with the growth of rice, and there is hope for a drastic solution.

[Failure to solve the problem]

The present inventors have discovered that the compound of formula 1 significantly reduces the above-mentioned salt damage and herbicide-induced damage. That is, it has been found that the compounds of formulas (1) and (It) (hereinafter referred to as epiprasinolides) are excellent salts and safeners.

The present invention will be explained in detail below.

Epiprasinolides used in the present invention can be produced, for example, by the method disclosed in JP-A-60-139685, specifically (22R).

23R,24R)-2α,3α,22.23-tetrahydroxy-B-homo-7-oxa-5α-ergostan-6-one (compound where R=H in formula (II), hereinafter referred to as epibrassinolide) (referred to as (U)).

or (228,238,24R)-2α, 3 α, 2
2゜23-tetrahydroxy-B-homo-7-oxa-
5α-Nylgoscun-6-one (Formula (■) Nioi-1 (
Examples include compounds where R=H (hereinafter referred to as shrimp brassinolide (I)) or acetyl forms thereof.

The salts and phytotoxicity reducers of the present invention are prepared by diluting epiprasinolides with water to an extremely low concentration, or by mixing a pesticide adjuvant in order to promote or stabilize the effects of epiprasinolides. , powders, granules, granules, wettable powders,
It can be used in the form of a flowable agent or emulsion.

The agrochemical adjuvants mentioned here include carriers (diluents) and other adjuvants such as spreading agents and emulsifiers.

Examples include wetting agents, dispersing agents, fixing agents, and disintegrants.

Examples of liquid carriers include aromatic carbonized limescale such as toluene and xylene, alcohols such as methanol, butanol and glycol, ketones such as acetone, amides such as dimethylformamide, sulfoxides such as dimethyl sulfoxide, and methylnaphthalene.

Examples include cyclohexane, animal and vegetable oils, fatty acids, and fatty acid esters.

Solid carriers include clay, kaolin, and talc.

Diatomaceous earth, silica, calcium carbonate, montmorillonite,
Examples include bentonite, feldspar 1 quartz, alumina, and sawdust.

In addition, surfactants are usually used as emulsifiers or dispersants, such as anionic surfactants such as higher alcohol sodium sulfate, stearyltrimethylammonium chloride, polyoxyethylene alkylphenyl ether, lauryl betaine, and cationic surfactants. , nonionic surfactant 1 and amphoteric ionic surfactant.

When using these carriers, it is important to carefully examine the carrier that is most suitable for promoting the effects of prasinolides.

All formulations can not only be used alone, but also mixed with fungicides, insecticides, plant growth regulators, acaricides, agricultural and horticultural fungicides, soil fungicides, soil conditioners, or nematicides. It can also often be used in combination with fertilizers and other herbicides.

The salts and safeners of the present invention obtained by these methods may be used depending on the dosage form and purpose of use.

Roots of one crop by methods such as spraying, scattering, and dipping.

Leaves, stems, flowers, fruits or seeds can be treated.

Among these, the preferred processing method will be explained.

Treatment with the salt or phytotoxicity reducer of the present invention is particularly preferred before using a herbicide or before sowing or transplanting seeds or seedlings of crops (paddy rice) into paddy fields containing salt.

In the case of paddy rice, for example, the seeds can be immersed in an aqueous solution of salt and a phytotoxicity reducer, or the seedlings in a nursery box can be sprayed with the aqueous solution or the seedlings can be immersed in the aqueous solution.

In the case of crops grown in fields, seeds or about five leaves may be immersed in the aqueous solution.

Ordinary immersion and spraying with the salt of the present invention and a chemical harm reducer.

The treatment time varies depending on the type of crop and the type of treatment, but is usually 1 hour to 72 hours, preferably 3 to 48 hours.

Examples of herbicides whose phytotoxicity is reduced by the salts and phytotoxicity reducing agents of the present invention include promethrin, butachlor, bentiocarb, plateochlor, alloxydim, linuron, and the like.

〔Effect of the invention〕

As is clear from the examples below, depending on the herbicide,
The salt of the present invention suppressed the plant height of paddy rice by 25 to 50 inches;
It was found that treatment with a drug damage reducer resulted in remarkable recovery. In addition, the salt of the present invention shows that the plant height has decreased by around 30% due to salt damage and yellowing of the leaves of the first leaf has occurred.

It was confirmed that treatment with a drug damage reducer resulted in a remarkable recovery.

〔Example〕

The present invention will be explained below with reference to Examples.

Formulation Examples Next, formulation examples of the present invention will be explained in more detail.
The types and mixing ratios of additives are not limited to these, and can be used in a wide range. Note that 1 part refers to parts by weight.

Formulation Example 1 84.9 parts of a mixture of xylene and inglovir ether (1i1) was added and dissolved in 0.1 part of emulsion eprasinolide (■), and then polyoxyethylene alkylphenyl ether and calcium alkylbenzene sulfonate were added. An emulsion is obtained by mixing with 15 parts of a mixture (8:2) of

Formulation Example 2 Powder A powder is obtained by adding 99 parts of clay to 1 part of Ebiprasinolide (I[) and mixing and pulverizing the mixture.

Formulation example: 0.1 part of the wettable powder eprasinolide (If) is mixed with a carrier of 10 parts of diatomaceous earth and 69.9 parts of kaolin, and then sodium lauryl sulfate and sodium 2,2-dinaphthylmethanesulfonate are added. 20 parts of the mixture were mixed evenly and then pulverized to obtain a finely powdered water use agent.

Formulation Example 4 Granules Using a suitable mixer, 0.1 part of fine powder of Ebiprasinolide (1) was added to 98.4 parts of silica grains (16-32 mesh) and 1.5 parts of polyvinyl acetate. Granules are obtained by spreading and coating using a methanol solution as a binder.

Formulation Example 5 Paste Ebiprasinolide CI) + (n) (6: 4
) o, 1 part o, 10 parts ethyl alcohol, and 89 parts lanolin
．． Prepare by uniformly mixing 99 parts.

Test Example Test Example 1 A solution of Epibrassinolide (I) or (II) diluted in
) for 48 hours at room temperature. Place a certain amount of sea sand in a small pot with an inner diameter of 9 mm and add benchocarb (0.1 to lppm).
), butachlor (o, o s -o, sp ppm
) was added 10 m/L, Epibra-ssinol, l
e 15 grains of soaked rice were placed in each pot.

The plants were grown indoors under diffused light for 15 days and the plant height was measured.

The results are shown in Tables 1-1 to 1-4.

Table 1-1 Effect of butachlor on reducing growth inhibition (variety: thick) Table 1-
3 Growth inhibition effect of Benthiocarb (variety: Taimei) Test Example 2 (Salt damage reduction test on rice) Kpibraesinolle (1) solution (1) in which rice seeds (Korea Rice-Fung, Taimei, Miryang No. 23) were diluted to a predetermined concentration (
1 ppm-1o-7 ppm) for 48 hours at room temperature. Sprinkle a certain amount of sea sand into a small pot with an inner diameter of 9 brocades and add NaC1.
A 500-3000 ppm solution of Kpibraeeinolide was added for 15 days per pot, and 15 grains of Kpibraeeinolide soaked rice were sown per pot. Bk plant height was measured on the 18th.

The results are shown in Table 2.

Table 2 Salt damage reduction effect 117 completed-

Claims (1)

[Claims] (1) Formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (I) and Formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ (II) (In the formula, R represents a hydrogen atom or an acetyl group.) From prasinolides A crop salt or phytotoxicity reducer characterized by containing at least one selected compound.