JPS60123402A - Method for promoting growth of rice plant - Google Patents

Abstract

PURPOSE:To stabilize the emergence ratio and the percentage establishment of rice, to promote the first growth, and to accelerate the growth of rice in the direct sowing in flooded paddy field, by dusting the seed of rice with metalaxyl before seeding. CONSTITUTION:The seed of rice (preferably subjected to the germination hastening treatment) for the direct sowing in flooded paddy field is dusted with metalaxyl, i.e. N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-alanine methyl ester. The amount of metalaxyl applied to the seed is 0.001-0.5%, preferably 0.01-0.1% based on the weight of the seed. The active component may be used together with other plant-growth regulator, a fungicide, an insecticidal fertilizer, etc. EFFECT:The instability of the establishment of the seedling caused by the deviation in the seeding depth can be solved, and the seedling can be established stably irrespective of the climate after the seeding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for promoting the growth of rice in direct sowing cultivation in flooded soil.

In recent years, there has been a call for cost reduction in rice cultivation, and various improvements have been made to rice cultivation techniques with the aim of saving labor.Among these, direct sowing cultivation in flooded soil is attracting attention as a new labor-saving rice cultivation method. There is. In other words, in direct sowing cultivation in flooded soil, the seeds are planted in the plowed wet soil using a surface seeding machine, so compared to conventional mechanical transplant cultivation, the labor of raising seedlings can be completely omitted, but it is less expensive. be. However, in this method of direct sowing cultivation, it is necessary to maintain a uniform seeding depth in order to stabilize the germination rate and bacterial establishment rate, but this may not be ideal due to the hardness and softness of the paddy soil or individual differences in sowing technique. The seeding depth often varies widely from around 1. As the seeding depth increases to 3α or more, the germination rate and bacterial establishment rate decrease due to physiological disorders caused by lack of oxygen. Because of this, the growth of rice once sprouted is poor. In addition, the sowing period for direct sowing cultivation in flooded soil is
It is carried out from late April to mid-June, depending on the region, but especially when sowing from late April to mid-May, there are many chances to encounter low temperatures after sowing, and the sown seeds or sprouted rice Injured seedlings are damaged by low temperatures and their seedling establishment rate decreases. In this way, direct sowing cultivation in flooded soil has the great advantage of being labor-saving, but on the other hand, it tends to lower the germination rate and seedling establishment rate due to various factors, and is prone to poor initial growth. It also has the disadvantage of not being able to secure an effective number of tillers, resulting in lower yields. In other words, in order to successfully achieve direct sowing cultivation in flooded soil, it is necessary to ensure stable bacterial establishment and encourage early growth, regardless of the condition of the paddy soil after puddling or the quality of the environmental conditions after sowing. The most important thing to do is to strain it.

The method of the present invention involves directly sowing rice in flooded soil, cultivating rice yuzu with N-(2,6-dimethylphenyl)-N-
(Methoxyacetyl)-This is a method for promoting the growth of rice, which uses trj symptoms, by coating with methyl ester of alanine (generic name: metalaxyl) and sowing.

When direct seeding cultivation is carried out using the method of the present invention,
It promotes the growth of rice, eliminates the instability of seedling establishment caused by variations in sowing depth, and improves the climate VC after sowing.
It is possible to maintain a stable bacterial population without being affected.

In the present invention: 1.3 The metalaxyl used in the present invention is known as an agricultural counteracting agent that has a strong bactericidal effect specifically against algae and fungi (Japanese Patent Publication No. 43573/1983).
Furthermore, it is known that it is effective as a preventive agent for the prevention of stuffy seedlings by applying it to seedling boxes for transplant cultivation (Japanese Patent Application Laid-open No. 79603/1983). It is completely surprising that direct sowing without flooding can stabilize the germination rate and seedling establishment rate and promote early growth.

The active ingredient of the present invention is mixed with a powder carrier in a conventional manner to form a powder coating in the same manner as in the production of wettable powders or powders.

In order to stabilize the germination rate and bacterial establishment rate and promote early growth in direct sowing cultivation in flooded soil, rice seeds may be coated with the active ingredient of the present invention. As the rice seeds, pigeon germinating rice is preferably used. In this case, the coating amount used is 0.05% to 0.05%, preferably 0.01 to 0.1%, based on the weight of the seeds as metalaxyl.

The active ingredient of the present invention can also be used in combination with other plant growth regulators, fungicides, insecticides, fertilizers, etc. As such, for example, cutigalen, gibberellin,
Calcium peroxide etc. can be used.

Formulation example Ribbon type fine powder clay for wettable powder mix 87.974
1 (, Neoken Powder (Daiichi Kogyo Seiyaku! 1 Kikuma product name)
50 parts, polyvinyl alcohol powder t.

After mixing 1.1 parts of white carbon (5.0 b+) and 1.1 parts of metalaxyl raw material (Part 92), the mixture was ground in a hammer mill to obtain a powder coating containing 4% metalaxyl.

Next, a test example of the method for promoting rice growth of the present invention will be shown.

Test Example Rice seed germination and early growth promoting effect [Test Method J After coating germinated paddy rice (variety: Koshihikari) seeds with a test drug prepared according to the formulation example above, 3 times per yuzu weight, Pl 00 grains ti+i per box were drawn into a vat manufactured by Flasnac (31×24 on, height 11 cm). The seeds were soaked in the soil for four summers at a constant exploration rate of nr, submerged in water at a depth of 1α, and allowed to germinate and grow in an artificial climate chamber outside tJ. In addition, in the low-temperature area, the temperature was maintained at 1l-1120°C during the day and at 15°C at night, and in the Tsutsu-on area, the temperature was maintained at 30°C during the day and 25°C at night. The test was conducted in 4 consecutive days, with the low-temperature zone being surveyed 120 days after sowing, and the high-temperature zone being surveyed 10 days after sowing.

The results are shown in Table 1.

Table 1: Meclaxyl 1% powder coating ** Metalaxyl 0.5 + Tatigaren 4% powder coating Izui
No drug damage was observed in t.

Special and former employees: ti people Sankyo Co., Ltd.

Claims (1)

[Claims] In rice direct sowing cultivation in flooded soil, rice yuzu is N −
(2,6-dimethylphenyl)-N-(methoxyacetylnoalanine methyl ester fii:
B: A method for promoting the growth of rice with ilf as a characteristic.