JPS6259202A - Powdery coating agent for paddy rice seed - Google Patents

Abstract

PURPOSE:The titled powdery coating agent, containing a specific compound having the properties of reaction with water to release oxygen, e.g. calcium peroxide or magnesium peroxide, EDDP, etc., and capable of improving the germination ratio and effectively growing paddy rice with a small amount of chemical. CONSTITUTION:A powdery coating agent containing calcium peroxide or magnesium peroxide and N-(2,6-dimethylphenyl)-N-(methoxyacetyl)alanine methyl ester (metalaxyl), having high antimicrobial activity against algal fungi and for preventing fungi of damping-off occurring in a seedling raising boxes, etc., and O-ethyl-S,S-diphenyl dithiophosphate (EDDP) and 4,5,6,7-tetrachlorophthalide (phthalide) useful for blast of paddy rice as active constituents. The mixing ratios based on the calcium peroxide, etc. are preferably as follows; 30-100ppm metalaxyl and 300-800ppm phthalide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dusting agent for water S seeds for direct sowing in flooded soil.

In recent years, a new cultivation method for paddy rice has been introduced in Japan, in which seeds are sown in soil at a depth of 1 to 1.51 m. This method not only greatly reduces the labor and time required to raise seedlings, but also eliminates mechanical planting during transplanting. There is no damage, and by encouraging tillering, it is expected that the yield will increase by 10-20%.

However, when tankkc bare paddy is submerged in water, the depth is 1~1.
Even if the seeds are sown in 1.5 clm of soil, there will be a lack of oxygen and it will not be possible to expect smooth germination and growth.

As a way to overcome this problem,
Publication No. 51 (Water S Seed Germination Promotion Method) and Equity 1185
No. 5-22045 (direct sowing method in flooded soil) is mentioned. That is, calcium peroxide aids in the germination of rice seeds by utilizing the property of reacting with water in the soil and gradually releasing oxygen.

However, even with seeds coated with such chemicals, under poor environmental conditions such as strong reduction days or low temperatures after sowing, poor seedling emergence may occur.

One way to solve this problem is to mix calcium peroxide with 5-methylisoxazole in 3-hydrochloride (trade name: Tachigaren) and coat the seeds with the mixture, which is expected to be more effective. It is said that it is possible [Masami Ogawa et al.
Agriculture and Horticulture 4B, 1297-1300 (1973)
). However, satisfactory effects cannot necessarily be obtained in all environmentally poor paddy fields.

The present inventors investigated the amount of lead in order to solve this problem, and as a result, discovered a unique effect of a specific compound, and completed the present invention. That is, the present invention provides calcium peroxide or magnesium peroxide, he-(2,6-dimethylphenyl)-N-(methoxyacetyl)alanine methyl ester (hereinafter referred to as metalla-syl), 0-ethyl-5,s-diphenyldithio This is a rice seed dressing for direct sowing in flooded soil containing phosphate (hereinafter referred to as EDDP) and 4,5,6,7-tetrachlorophthalide (hereinafter referred to as futhalide).

Metalaxyl has high antibacterial activity against algal fungi and has been used in combination with a powdery mildew agent to prevent the fungus that grows in paddy rice seedling boxes, while EDDP and fusaride are mainly used for rice blast disease. It is used for Furthermore, when these are used alone, although a slight improvement in germination is observed, this cannot be said to be a practical effect. However, by mixing the above-mentioned three agents, a remarkable improvement in the germination rate is observed, and at the same time, the medicinal appearance can be reduced by about half compared to when these are used alone.

In carrying out the present invention, there is a method in which metalaxyl, EDDP, and fusaride are mixed in advance with calcium peroxide, etc. as a dressing agent, and then the seeds are immersed in a diluted suspension of a mixture of the five chemicals listed above before dressing. After that, there are methods such as coating the calcium peroxide, etc., or replacing the water used when coating the calcium peroxide with a diluted sulfur solution mixed with the chemical described in 6. Available.

Furthermore, if necessary, it can be used in combination with known drugs that have been shown to prevent the effects of calcium peroxide from decreasing, or in combination with plant growth regulators that have a growth-promoting effect depending on the purpose. You can also.

The mixing ratio of calcium peroxide, etc., metalaxyl, EDDP and fusaride is based on calcium peroxide preparations (for example, powder dressing preparations containing 8% effective oxygen, such as brand name Calper powder) or magnesium peroxide preparations (
For example, for a dressing preparation containing 8% effective oxygen and calcined kola as a caking agent (hereinafter referred to as Mf02 agent), metalaxyl is 20 to 200 ppm, EDDP,
Fut? 100-1000 ppm for 4M pigeons. Preferably metalaxyl 50-100 ppm, B
DDP, 7f? Both IDs are 300~s o o
It is ppm. The amount of metalaxyl added to Culver powder, etc. per 10 ares is about 5 to 4 ml, and the amount of metalaxyl added to Culver powder, etc. is less than 1 f, and even the amount of BDDP and fusaride added is extremely small, less than 10 f. That's fine.

The reason why the powder contributes to good growth is currently unknown, but it may promote the decomposition of the carver powder, etc. during the process from germination to seedling establishment, take away the generated P& elements, or have a growth inhibiting effect. It is thought that it may inhibit the growth of microorganisms that have an unfavorable effect on germination and seedling establishment, such as by producing substances with Conceivable.

The usefulness of the present invention will be explained below by showing test examples.

Test Example 1 Test dry powder weight and etc. in organic matter added soil
0.5% mecraxyl aqueous solution and EDDP for each of the Calper powder and MP of t.

Fusaride mixed hydrating agent (trade name Hinorapside hydrating agent,
(containing 15% EDDP and 20% fusaride) was mixed in an appropriate amount and coated on paddy rice seeds (variety Koshihikari) using a conventional method. Twenty of these seeds were sown at a depth of 18 m on paddy fields containing 0.2% starch. After sowing, the seedlings were submerged in water for 30 minutes and placed in a biotron at 20° C. in the dark, and the number of sprouts was examined over time. The test was conducted four times, and the results are shown in Tables 1 and 2 as average values.

Table 1 Mixed with Calper powder Table 2 Mixed with Mr, 2 agents Test example 2 Test in the field 0.5% metalaxyl in paddy rice seeds (variety Sasanishiki)
Liquid formulation or Metafuxil 0,5 Norapside hydrating agent (
A predetermined amount of the mixture (containing 15% EDDP and 20% fusaride) was diluted and mixed with the same weight of carba powder as the dry powder in the water used when dressing. Seeds coated as described above were sown in an amount equivalent to 4 kg of dry powder (50 grains/m2) per 10 ares in about 1 country below the surface of the soil of a paddy field that had flooded on April 24th, and then submerged in water at a depth of 3 cI11. did.

One month after sowing, the number of healthy bacteria and the number of bacteria at the 1.5 leaf stage or above were investigated. The test was conducted with 1 row, 1 section, 1 m, and 10 repetitions. The average ground temperature (15 m) during this period was 11 to 20°C. The average values of the results are shown in Table 3.

Table 3 Test Example 5 [! Meclaxil 065% in test water 81 mung roe (variety Kitaake) in field 11
Liquid formulation or Mecraxil 0.5% liquid formulation and Hinolabside hydrating agent (contains EDDP 15%, Fusaride 20%)
The same weight of M as the dry powder was prepared using a conventional method.
The rO□ agent was diluted and mixed with the water used for dressing. Seeds coated as described above were sown in an amount equivalent to dry powder B kg (100 grains/m) per 10 ares about 1 cm below the soil surface of a paddy field that had been flooded on May 17th, and submerged in water to a depth of 3 cm. . At the 5th late sowing, the number of healthy bacteria and '
The number of bacteria at the 5-leaf stage and above was investigated. The test was conducted with 1 row, 1 section, 1 m binding, and 10 repetitions. The average soil temperature during this period was 8 to 24°C. The average values of the results are shown in Table 4.

Table 4 ■ No treatment -56,64i As is clear from the above test example, metallized Φsil, BDDP
A significant increase in the number of germination and the number of seedlings established was observed in both cases of seeds coated with a mixture of fusaride and carver powder. In other words, it was shown that the effect of Culper powder etc. is prevented from decreasing and the seedling establishment rate is improved both under artificially enriched soil conditions and under field conditions.

Examples are shown below.

Example 1 Carba powder 97.7 parts metalaxyl 0.5% liquid 2.0 parts by weight Hinorapside wettable powder (EDDP 15%).

Although 0.3 parts by weight or more (containing 20% fusaride) was thoroughly mixed, rice seeds were coated with water in an amount equal to the weight of the dry powder.

Example 2 MfO, agent (containing 8% effective oxygen) 95.0 parts by weight Metalaxyl 0.5% liquid agent 2. olff
Part i: Hinolapside powder (BDDP 2%).

Although 40 parts by weight or more of fusaride (containing 1.5%) were thoroughly mixed, the same amount as the weight of the dry powder was coated on paddy rice seeds using water.

Example 5 An amount of Calper powder equal to the dry powder weight was mixed with Mecraxil 0.5% solution, which corresponds to 3% of the Calper powder.

and Hino Rabside Hydrating Agent (ED) equivalent to 0.2%
It was coated with water mixed and diluted with DP (containing 15% DP and 20% fusaride).

Hodogaya Chemical Industry Co., Ltd.

Claims (1)

[Claims] Calcium peroxide or magnesium peroxide, N-(2
,6-dimethylphenyl)-N-(methoxyacetyl)
A rice seed dressing for direct sowing in flooded soil containing alanine methyl ester, o-ethyl-s,s-diphenyldithiophosphate and 4,5,6,7-tetrachlorophthalide.