JPS5918362B2 - Method for promoting seed germination - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compound of the general formula [wherein R1 and R2 are the same or different and represent a lower alkyl group].

) in combination with 3-hydroxy-5-methylisoxazole.

Plant seeds require the presence of suitable moisture, temperature and oxygen for their germination.

When sowing crop seeds, the sown seeds are often covered with soil.

This is to help retain the moisture necessary for seed germination, but it also prevents the seeds from being eaten by birds and animals.
It also helps prevent seeds from being moved by wind and rain.

In addition, it is useful for avoiding damage caused by low and high temperatures to pre-emergent seeds during cold and hot seasons, and also for preventing lodging of plants after germination.

However, if the covering soil is too thick, germination may be impaired due to lack of oxygen, and the stored nutrients in the seeds may be exhausted before the buds appear above the ground, resulting in poor subsequent growth. .

One example of this is the direct seeding of wet rice in dry fields.

Stabilizing the management of rice cultivation, which is Japan's representative crop,
In order to introduce mechanization and establish labor-saving management, the advantages of direct sowing cultivation methods that omit the conventional seedling transplanting work that requires a great deal of hard labor have been emphasized, and research has already been carried out for a long time. The area covered is extremely small.

In paddy rice dry field direct sowing cultivation, 3 to 5 crr after sowing.
L of soil is required.

However, because of this covering with soil, about 50 percent of the seeds sown fail to germinate, and the seedlings that do germinate are unhealthy and cannot withstand the low temperatures of early spring, often resulting in poor seedling establishment.

This increases the amount of seeds sown and the cost of seeds.

Such poor budding and seedling establishment is one of the reasons preventing the spread of dry field direct seeding cultivation.

The present inventors have been researching the effects of chemical treatment to improve poor germination and seedling establishment in paddy rice grown directly in dry fields.
Here, an isourea compound having the general formula (I),
Paddy rice seeds are coated with a preparation containing 3-hydroxy-5-methylisoxazole (Sankyo Co., Ltd. trade name: Tachigaren 2, hereinafter referred to as Tachigaren), or paddy rice seeds are soaked in a water diluted solution of the above preparation. It has been found that this method has a remarkable effect on improving the germination of paddy rice and stabilizing the establishment of seedlings.

The active ingredient according to the present invention can be mixed with a carrier and other adjuvants as necessary to form a formulation commonly used as a plant growth regulator for agriculture and horticulture, such as powder, coarse powder, fine granule, granule, etc. It is prepared and used in wettable powders, emulsions, etc.

Suitable solid carriers include clay, talc, kaolin,
bentonite, diatomaceous earth, calcium carbonate, silicic anhydride,
Examples include inorganic substances such as synthetic calcium silicate.

Suitable liquid carriers include water; aromatic hydrocarbons such as benzene, toluene, xylene, methylnaphthalene, and tetralin; ketones such as acetone and methyl ethyl ketone; and amine derivatives such as ethanolamine and dimethylformamide.

Furthermore, the agricultural and horticultural plant growth regulator of the present invention contains various nonionic and ionic surfactants, sodium alginate, carboxymethyl cellulose, methyl cellulose, A polymer compound such as hollyvinyl alcohol or other auxiliary agent can also be used in combination.

Of course, it can also be used in combination with other fungicides, insecticides, herbicides, plant growth regulators, fertilizers, etc.

In the plant growth regulating method of the present invention, a powder containing the compound of the general formula (I) and Tachigalen is directly coated on seeds and sown, or it is prepared in the form of a conventional emulsion, wettable powder, tablet, etc. After preparing the preparation and diluting it with water at the time of use, the seeds are immersed in the solution for one or two nights and then sown, but the method is not necessarily limited to these methods, and depending on the usage situation, convenience, etc. Other methods may be used as appropriate.

In order to achieve the objective by the plant growth regulating method of the present invention, in the case of a powder, the compound of the general formula (I) must be
5-20%, preferably 1-10%, 0.5%
It is preferable to contain up to 20%, preferably 1 to 10%.

In this way, a powder containing the compound of the general formula (I) and Tachigaren as active ingredients is used by applying powder treatment in an amount of 0.5 to 20%, preferably 1 to 10%, based on the weight of the water-soaked seeds. do.

In the case of emulsions, wettable powders or tablets, the concentration of the active ingredient in the solution prepared by diluting with water is 10 to 110,000 pp, preferably 100 to 110 pp.
00 pp, and Tachigaren is contained in an amount of 50 to 1,010,000 pp, preferably 300 to 11,000 pp, but the present invention is not limited thereby.

Next, the synergistic effect of the plant growth regulator of the present invention will be explained with reference to test examples.

Test Example: (A) was added to seeds of paddy rice (variety: Zennanfu) that had been soaked in water for two days and nights.
5% dust of 1-(p-)lylcarbamoyl)-3-methoxycarbonyl-2-ethyl isourea, and 4% dust of CB) Tachigalen, each at 3% per wet seed weight.
After applying powder coating either singly or in combination, 1.
Thirty seeds were sown per box.

After sowing, cover soil to a thickness of 4 cm for each flour-treated area.
A plot with a different IfL height and 5 cm was established, and the germination rate and plant weight (7 boxes) were investigated 10 days after sowing and 1 and 15 days after sowing.

The test was conducted in four series, and the results are shown in the table below.

■、Sprouting rate (%) (Note) The difference in parentheses is the difference from untreated. 2. plant weight

Claims (1)

[Claims] Formula 1 [wherein R1 and R2 are the same or different and represent a lower alkyl group]. ) in combination with 3-hydroxy-5-methylisoxazole.