JP2546334C - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for increasing rice yield. <Prior Art> In general, it is known to use a plant growth regulator as a mixture with a fertilizer for the purpose of efficiently exhibiting the effect of the plant growth regulator (Japanese Patent Laid-Open No. 59-5101). However, plant growth regulators and fertilizers are not always awarded because they cause a decrease in the number of spikelets and lodging in rice depending on the time of application, and eventually cause a decrease in yield. <Means for Solving the Problems> Under such circumstances, the present inventors have conducted intensive studies on the application of plant growth regulators and fertilizers to rice, and found that triazole-based plant growth regulators were used during the panicle formation stage. By treating the fertilizer composition containing, it is possible to suppress the elongation of the culm without causing degeneration of the spikelets, and thus it is possible to stably increase the yield of rice. Reached. That is, the present invention provides a method for increasing rice yield by applying a fertilizer composition containing a triazole-based plant growth regulator to rice at the stage of panicle formation. In the method of the present invention, the panicle formation period refers to a period of 2 to 3 days at which the differentiation of the spikelets begins (early stage of spikelet differentiation), which is usually about 24 days before heading although it depends on the rice variety. is there. Examples of the triazole-based plant growth regulator include (E) -1- (4-chlorophenyl) -4,4-dimethyl-2- (1,2,4-triazol-1-yl) -1- Penten-3-ol (hereinafter referred to as compound A. JP-A-56-25105)
Publication) or a salt thereof, (E) -1-cyclohexyl-4,4-dimethyl-2-
(1,2,4-triazol-1-yl) -1-penten-3-ol (hereinafter, referred to as
Described as compound B. JP-A-51-111777) or a salt thereof, 1- (4-
Chlorophenyl) -4,4-dimethyl-2- (1,2,4-triazole-1-
Yl) pentan-3-ol (hereinafter referred to as compound C. JP-A-53-28170)
Or its salts. These triazole-based plant growth regulators are usually formulated into emulsions, wettable powders, suspensions, granules, etc. using solid carriers, liquid carriers, surfactants and other formulation auxiliaries. Used. These preparations contain the active ingredient in an amount of 0.04 to 90% by weight, preferably 0.04 to 90%.
It contains 4 to 50%. Examples of solid carriers include kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut powder,
Examples of the liquid carrier include fine powders and granular materials such as urea, ammonium sulfate and synthetic hydrous silicon oxide. Examples of the liquid carrier include aromatic hydrocarbons such as xylene and methylnaphthalene, and alcohols such as isopropanol, ethylene glycol and cellosolve. And ketones such as acetone, cyclohexanone, and isophorone; vegetable oils such as soybean oil and cottonseed oil; dimethyl sulfoxide; acetonitrile; and water. Examples of surfactants used for emulsification, dispersion, wet spreading, etc. include alkyl sulfates, alkyl (aryl) sulfonates, dialkyl sulfosuccinates, and polyoxyethylene alkyl aryl ether phosphorus. Anionic surfactants such as acid ester salts, polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene polyoxypropylene block copolymer, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, etc. Nonionic surfactants and the like. Pharmaceutical adjuvants include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CM
C (carboxymethyl cellulose), PAP (isopropyl isopropyl phosphate) and the like. Examples of the fertilizer include nitrogen substances such as urea, ammonium sulfate, ammonium nitrate, salt ammonium salt, and uraform; phosphoric acids such as phosphorus phosphate, lime superphosphate, and lime heavy superphosphate; and potassium substances such as chloride potassium and sulfate potassium. Alone or nitrogen-phosphate, nitrogen-kali, phosphate-kali binary system or nitrogen-phosphate-kali ternary system, or magnesium, boron, manganese or other elements necessary for plant growth. In addition, these fertilizers include materials for preparing ingredients such as masonry, and water-insoluble clay minerals such as diatomaceous earth, talc, and bentonite used to prevent the emergence of fertilizers during paddy field application. And fertilizer granulated by a usual method and granulated. In the method of the present invention, at the time of application, a fertilizer composition containing the above-mentioned triazole-based plant growth regulator is prepared in advance and applied. By using such a composition, the composition can be omitted at the time of application, and a more stable effect can be exhibited. Such a fertilizer composition can be obtained, for example, by coating the above-mentioned granular fertilizer with a mixed solution of a triazole-based plant growth regulator and triethylene glycol. At this time, the content of the plant growth regulator in the fertilizer composition is usually 0.001 to 0.
. 02% by weight, and the content of fertilizer is usually 8 to 80% by weight. If the amount of triethylene glycol used is too small, the surface of the fertilizer cannot be uniformly coated, and if the amount is too large, it is not only economically disadvantageous, but also the fertilizer component decreases. And usually 0.1 to 5% by weight, preferably 0.1% by weight, based on the fertilizer.
3 to 2% by weight. As a method for preparing such a fertilizer composition, typically, after dissolving a plant growth regulator in triethylene glycol, this may be coated by, for example, spraying it on a granular fertilizer. Most commonly, the granular fertilizer is rolled using a device such as a rotating cylinder or a rotating dish, and sprayed with triethylene glycol containing a plant growth regulator.
A method is employed in which the material is treated and then, while being rolled, an anti-caking agent such as talc or diatomaceous earth is added to coat the material. In the method of the present invention, the application rates of the triazole plant growth regulator and the fertilizer are:
The amount of the active ingredient is usually 0.05 g / a to 20 g / a and 40 g / a to 8 g, respectively.
000 g / a. <Examples> Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto. Example 1 Rice (cultivar: Koshihikari) was cultivated in a field, and 24 days before heading, granular fertilizer containing 0.0056% of compound A (N: 14%, P ₂ O ₅ : 2%, K ₂ O: 13) %
) Was treated with paddy water at 2100 g / a. At the same time, the control fertilizers were provided with the fertilizers containing no compound A but having the same composition of fertilizer components applied 24 and 19 days before heading. After that, the cultivation was continued, and the components of rice yield during the harvest period (the number of panicles per m ² ,
The number of single ear flowers, ripening rate, 1,000 grain weight), yield (brown rice weight), culm length, and degree of lodging were measured. The test was performed in two replicates of 20 m ² per section. The results are shown in Table 1 as average values. As is clear from the above table, in control group-1, the number of spikelets per ear was small, but the culm length was rather short and the degree of lodging tended to be slightly light, but the yield was low. The number of spikelets per unit was secured, but the length of the culm was extended, so that the degree of lodging was large and the yield was low. On the other hand, in the present invention section-1, since the number of spikelets per ear was secured and the elongation of the culm was suppressed, lodging was clearly reduced, the ripening rate was improved, and the yield was clearly increased. Comparative Example 1 Rice (cultivar: Koshihikari) was cultivated in a field, and granules containing 0.04% of compound A and fertilizer (N: 14%, P ₂ O ₅ : 2%, K ₂ O) 24 days before heading : 13%)
Was applied at a rate of 300 g / a and 2100 g / a, respectively. At the same time, the ward where only the above fertilizer was applied on the 24th and 14th days before heading, and
On the 24th before heading, the granules containing Compound A were applied, and on the 14th, a section to which the fertilizer was applied was provided as a control section. Thereafter, the cultivation was continued, and the same measurement as in Example 1 was performed. The results are shown in Table 2 as average values. As is clear from the above table, in control section-3, the number of spikelets per ear was secured, but the degree of lodging was large due to elongation of the culm, and in control section-4, the number of spikelets per ear was slightly less. However, the culm length was rather short, and the degree of lodging tended to be slightly light, but the yield was low. In contrast, in control group-5, although the yield component was improved due to the reduction in lodging, the number of spikelets per ear was significantly reduced, resulting in a decrease in the yield. On the other hand, in the control section-1, the fertilization effect ensured the number of single ear flowers and suppressed the elongation of the culm, which clearly reduced lodging and increased the yield. Comparative Example-2 Rice (cultivar: Koshihikari) was cultivated in a field, and granules containing 0.6% of compound C and fertilizer (N: 14%, P ₂ O ₅ : 2%, K ₂ ) 24 days before heading O: 13%) at a rate of 300 g / a and 2100 g / a, respectively. At the same time, a section in which only the above fertilizer was applied on the 24th and 14th days before heading was respectively provided as a control section-6 and a control section-7, and the granules containing the compound C were applied 24 days before the heading, On the 14th day before, a section to which the above-mentioned fertilizer was applied was provided, which was designated as a control section-8. Thereafter, the cultivation was continued, and the same measurement as in Example 1 was performed. The test was performed in three replicates of 16 m ² per section. The results are shown in Table 3 as average values. As is clear from the above table, the number of spikelets per ear was secured in the control plot-6 and the control plot-7, but the degree of lodging was large due to the elongation of the culm. Although the effect of reduction was observed, the number of spikelets per ear decreased, resulting in lower sales. On the other hand, in Comparative Section-2, the number of single ear flowers was secured and the elongation of the culm was suppressed, so that lodging was reduced and the yield increased. <Effect of the Invention> The present invention complements the drawbacks and problems of the triazole-based plant growth regulator and fertilizer in rice cultivation, makes only the advantages of both of them advantageous, and stably increases the yield of rice. It is a way to increase.

Claims (1)

Claims: A method for increasing rice yield, comprising treating a rice plant in the panicle formation stage with a fertilizer composition containing a triazole-based plant growth regulator.