JPH0244797B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improvement in a method for controlling the growth of a plant family, such as rice, which reduces the internodes of a plant family, such as paddy rice, and promotes division. In recent years, in Japan, due to the overproduction of rice, there has been a growing preference for planting branded rice such as "Sasanishiki" and "Koshihikari", while the planting of feed rice for the sole purpose of increasing yield has also been discussed in various fields. It is being In general, many branded rice varieties belong to the long culm and heavy ear type, and in most cases, they have the fate of being prone to lodging. Lodging of paddy rice not only reduces the quality of the rice, but also reduces the yield and makes reaping work difficult. Therefore, there are many cases where cultivation management (reducing the amount of nitrogen fertilizer, early watering, etc.) is carried out at the expense of quality and yield to some extent. On the other hand, in the production of rice for feed, cultivation methods using mainly foreign rice are being considered in order to secure a yield of 1 ton or more per 10 ares. In order to meet the demands of the times, the present inventors selected agents from among conventionally known agents for preventing lodging of paddy rice, such as N-dimethylaminosuccinamic acid and (dichloroethyl)trimethylammonium chlorite. As a result of various selections, we made an aqueous solution of conventionally known 2-mercaptobenzothiazole and/or dibenzothiazyl disulfide in an alkaline aqueous solution, added and mixed this aqueous solution to various fertilizer substrates, and then added an inorganic acid to the substrate. If 1 to 5 kg of fertilizer with 2-mercaptobenzothiazole and/or dibenzothiazyl disulfide precipitated on the soil is applied as top dressing before or after planting, lodging can be prevented with a small amount of thiazoles added. The 4th and 5th most related paddy rice
It has been found that the internodes can be shortened and lodging resistance can be increased, and that the fertilizer base acts as a fertilizer for plants of the Phyllidae family. Next, the experimental method and experimental results will be explained. In the following table, Nos. 1 to 8 are the cases in which the paddy rice variety "Sasanishiki" was tested, and Nos. 9 to 10 are the cases in which the paddy rice variety "Houyoku" was tested. The amount of fertilizer applied in the experimental plots No. 1 to No. 8 was Chitsuso fertilizer (8.0 kg as N), phosphoric acid fertilizer (17 kg as P ₂ O ₅ ), and potassium fertilizer (8.6 kg as K ₂ O) per 10 ares.
Kg) was applied at the time of planting. No. 1 is the case where 2-mercaptobenzothiazole (hereinafter abbreviated as MBT) is not added, No. 2 is the case of N-P-K fertilizer with 2 kg of MBT added per 10 ares as powder, and No. 3 to 5
No. 7 is a solution of MBT soda salt dissolved in water, neutralized by adding phosphoric acid solution, and the amount shown in the following table is uniformly deposited on the surface of the fertilizer. This is a case in which fertilizer was not applied at the time of planting, but 15 days after planting, the same amount of MBT as in No. 5 was precipitated on the fertilizer substrate, and the fertilizer application amount in No. 8 test plot was No. 1 to No. 7. This is the case where the same fertilizer as above was fertilized with a caustic soda aqueous solution of dibenzothiazyl disulfide (DM) uniformly precipitated on the surface of the fertilizer in the amount shown in the following table. The amount of fertilizer applied in Experiment No. 9 to 10 test plots was per 10 are, Chituso fertilizer (12 kg as N) at the time of planting,
Phosphate fertilizer (7Kg as P ₂ O ₅ ) and potassium fertilizer (12Kg as K ₂ O) are applied, No. 9 is the case without adding MBT, and No. 10 is the case where MBT soda salt is dissolved in water. , when the above fertilizer was uniformly precipitated on the surface in the amount shown in the following table.

[Table] From the table above, when cultivating branded rice, separate from basal fertilizer.
It was found that applying MBT and/or DM reprecipitated into the base fertilizer at the time of planting or as top dressing showed better results than applying MBT and/or DM. Regarding the effect of suppressing plant height, it is better not to apply MBT separately with the base fertilizer (No. 2), but to add a solution containing MBT to the base fertilizer, mix uniformly, and then re-precipitate. With a small amount of MBT (No.
3) It was recognized that a great effect was expressed. Regarding the effect of increasing the number of tillers, the same tendency as the effect of suppressing plant height was observed, but a better effect was observed in short-culm and number-of-spikes varieties. The present invention is based on the above experimental results, and
In order to suppress the growth of plants of this family, an alkaline aqueous solution of MBT and/or DM is added to and mixed with the fertilizer substrate, and then an inorganic acid is added to neutralize it, and MBT and/or DM is applied onto the surface of the substrate. This is a method for suppressing the growth of plants of the family Herbaceae, which is characterized by producing and applying uniformly precipitated fertilizer. In the present invention, in order to precipitate MBT and/or DM on the surface of the fertilizer substrate, MBT and/or DM are dissolved in an alkaline aqueous solution such as caustic soda, or a soda salt of MBT is prepared and dissolved in water. This solution is added to and mixed with a fertilizer base such as gypsum or Tituso fertilizer, phosphoric acid fertilizer, potash fertilizer, etc., and then neutralized by adding an inorganic acid solution such as phosphoric acid, hydrochloric acid, or sulfuric acid to MBT and/or
DM is deposited on the surface of the gypsum or fertilizer substrate. The amount of MBT and/or DM deposited on the surface of the fertilizer substrate is 3 to 3% compared to the gypsum or fertilizer substrate.
Approximately 15% is preferable since it can be applied uniformly, and the application amount of MBT and/or DM is preferably about 2 kg per 10 are. According to the present invention, not only can the same effect be obtained as a growth regulator for plants of the family Herbaceae by using a smaller amount than the conventional amount, but also fertilizer can be supplied to plants of the family Herbaceae at the same time. Example 1 10 kg of commercially available MBT powder was mixed with 24 kg of 10% caustic soda solution.
Add this to 75 kg of gypsum, mix it, put it in a granulator, and add 10 kg of 30% sulfuric acid solution.
The product was granulated and dried to obtain 100 kg of product. This product contains
MBT is finely dispersed and re-precipitated in the product.
The MBT content was 10%, the pH of the product was 6.5, and the hardness was 1.6 Kg/cm ² . When this product was applied at a rate of 20 kg per 10 ares around 15 days after planting as a basal fertilizer for paddy rice, the effects of suppressing plant height and increasing tillering of branded rice were remarkable. Example 2 10 kg of commercially available MBT powder was added to 13 kg of 10% ammonia water and dissolved by stirring. This solution was added to and mixed with a mixture of 24.0 kg of potassium chloride for fertilizer, 4 kg of gypsum powder, and 52.8 kg of ammonium chloride for fertilizer. In this case the mixture was thoroughly moistened with an aqueous solution of MBT in ammonia. 12.7Kg of 40% phosphoric acid solution in this wet mixture
Gradually add, mix, granulate and dry to produce 100kg of product.
I got it. In addition to 10 kg of reprecipitated MBT, this product contains fertilizer components of 14.3% as N, 5.1% as P ₂ O ₅ , and 14.4% as K ₂ O, and the pH of the product is 6.5.
The hardness was 1.4Kg/ ^cm2 . This product has been shown to be effective in preventing lodging of branded rice by using it as a base fertilizer for paddy rice or as top dressing.

Claims (1)

[Claims] 1. In controlling the growth of plants of the family Oriental family, after adding and mixing an alkaline aqueous solution of 2-mercaptobenzothiazole and/or dibenzothiazyl disulfide to the fertilizer base, neutralize it by adding an inorganic acid to the fertilizer base. 1. A method for controlling the growth of a plant of the family Hematinaceae, which comprises preparing and applying a fertilizer in which 2-mercaptobenzothiazole and/or dibenzothiazyl disulfide are uniformly precipitated on the surface of a substrate.