JPH06100406A - Method for controlling elongation of crop - Google Patents

Abstract

PURPOSE:To suppress elongation of crop and to increase yield by applying natural type abscisic acid and ethephon. CONSTITUTION:In an elongation period of stem or branch of crop, natural type abscisic acid, one of plant hormones and ethephon showing ethylene action are applied to a crop to suppress the elongation of the crop. The application treatment is carried out by simultaneously spraying natural type abscisic acid and ethephon as a mixed solution containing both the components and the concentration in the mixed solution is 1-500ppm, preferably 10-100ppm, respectively. Root vegetables such as Japanese radish, beat or potato, fruit vegetables such as tomato or cucumber, grain such as rice, wheat, adzuki bean and fruits such as apple, Japanese persimmon or pear may be cited as the crop to be applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for suppressing the growth of crops. More specifically, it relates to a method for increasing the yield by suppressing the length extension of crops.

[0002]

2. Description of the Related Art It is one of the major problems of agricultural technology to increase the yield by suppressing the length of crops. Many techniques have been devised as methods and means for this purpose. One of the methods is to increase the yield by suppressing the overgrowth of crops and preventing overgrowth by using plant hormones. For example, paclobutrazol, uniconazole, hydrazide maleate, and ethephon have been put to practical use as growth inhibitors (“Utilization and prospect of plant growth regulators in dwarfing cultivation”, “Agriculture and Horticulture,” March 1991. 210-213
page).

[0003]

However, the utilization method and the degree of efficacy for expressing a practically effective potency for a wide range of crops are still limited, and the development of more effective methods is It has great significance in terms of agricultural production.

Natural abscisic acid is known as one of the plant hormones together with gibberellin, auxin, kainin, ethylene and the like. This abscisic acid is known to suppress plant growth (Ann. Re
v. Plant Physiol. Plant M
ol. Biol, 1988 Vol 39, 439-4
Page 73 "Metabolism and Phys
iology ofAbscisic acid ").

Ethephon, which has an ethylene action, has been put to practical use in some cultivars of wheat for the purpose of suppressing this elongation growth (“Plant Growth”).
Regulators ", Louis G. Ni
ckell, Springer-Verlag).

However, the effect of widely suppressing the growth of crops and increasing the yield has not been known. Further, regarding such utilization effect, there is no knowledge about the mixing effect of abscisic acid and ethephon.

[0007] The inventors of the present invention have earnestly studied the search for an effective method superior to the conventional knowledge regarding the technology for suppressing the length of crops by utilizing plant hormones.

[0008]

As a result, the present inventors have found that excellent effects can be obtained by using a natural abscisic acid and ethephon in combination in a specific method, and completed the present invention. .

That is, the present invention is a method for suppressing the growth of a crop, which comprises applying a natural abscisic acid and ethefone to the growth at the time of expansion of the stem or branch of the crop to suppress the growth.

The present invention will be described in detail below.

In the present invention, natural abscisic acid ((+)-
2-cis, 4-trans-abscisic acid) and ethephon (2-chloroethylphosphonic acid).

Natural abscisic acid can be produced by any method, for example, it can be industrially produced by the method described in JP-A-63-296697 or JP-A-63-296696. Ethephon is already commonly used as a plant growth regulator.

In the method for suppressing elongation of the present invention, natural abscisic acid and ethephon are sprayed at the time when the branches and stems of a crop grow. The spraying treatment is usually performed with a spray liquid. The natural abscisic acid concentration and ethephon concentration in the spray solution are usually 1 to 500 ppm, preferably 10 to 1 each.
It is 00 ppm.

The method of spraying the natural abscisic acid and ethephon is arbitrary, but usually, a mixed solution containing abscisic acid and ethephon is prepared and simultaneously sprayed.

In the method for suppressing elongation of the present invention, the spray liquid is prepared by using it together with other plant growth regulators, auxiliary agents such as spreading agents, emulsifiers, wetting agents, dispersing agents, sticking agents and disintegrating agents. Good.

Examples of the auxiliary agent used here include the following. As the liquid carrier, water, ethanol,
Examples thereof include alcohols such as methanol. As the emulsifier or dispersant, a surfactant is usually used, and examples thereof include anionic surfactants such as higher alcohol sodium sulfate, stearyl trimethyl ammonium chloride, polyoxyethylene alkylphenyl ether, lauryl betaine, and cationic surfactants. Examples include activators and zwitterionic surfactants. When using these carriers, it is important to examine and use the most suitable ones for promoting the effects of natural abscisic acid and ethephon.

The crop to which the method for suppressing elongation of the present invention is applied is not particularly limited. Examples include root vegetables such as radish, beet, and potatoes that harvest roots, fruit vegetables such as tomatoes and cucumbers, grains and beans such as rice, wheat, and adzuki beans, and fruit trees such as apples, oysters, pears, and grapes.

[0018]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto.

Example 1 Effect of barley elongation on wheat Barley (cultivar Norin 61) was cultivated conventionally in the field, and at the earing stage, natural abscisic acid (75 ppm each), 150 ppm (single solution), ethefone (75 ppm each), 100 liters of the 150 ppm single solution and the mixed solution were sprayed per 10 ares.

The yield per are, the average culm length and the degree of lodging were investigated during the harvest period. The results are shown in Tables 1 to 3. The degree of lodging was divided into 6 stages of 0 (no lodging at all) to 5 (complete lodging of all individuals) according to the degree of lodging of the plants in the test section by observation.

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

[Table 3]

As is clear from Tables 1 to 3, spreading of the mixed solution of natural abscisic acid and ethephon effectively suppressed elongation growth, resulting in suppressed lodging and increased yield. .

Example 2 Grape Branch Elongation Suppressing Effect Grape (Kyoho) 15-year-old tree (open-field cultivation) was tested,
At the early stage of branch elongation (30 days before the start of flowering), natural abscisic acid (50 ppm) and 100 ppm (single solution) Ethephon (50 ppm and 100 ppm, respectively) and a mixed solution were sprayed at a rate of 10 ml per shoot. The average branch length was measured during the flowering period 30 days after spraying. In addition, the average weight of the bunches harvested during the fruit ripening period was investigated. The results are shown in Tables 4 and 5.

[0026]

[Table 4]

[0027]

[Table 5]

As is clear from Tables 4 and 5, spreading of the mixed solution of natural abscisic acid and ethephon effectively suppressed the elongation growth, and as a result, the weight of the fruit cluster was increased.

Example 3 Potato length suppressing effect Potatoes (cultivar, make-in) were conventionally cultivated in the field, and at the initial stage of bud (initial stage of flower stem elongation), 25 ppm of natural abscisic acid and 50 ppm of single solution ethifone, respectively. 25pp
100 liters of m, 50 ppm single solution and mixed solution were sprayed per 10 ares, and the average length of the longest stem and the average harvested potato weight of each strain were investigated at the harvesting time. The results are shown in Tables 6 and 7.

[0030]

[Table 6]

[0031]

[Table 7]

As is clear from Tables 6 and 7, spraying a mixed solution of natural abscisic acid and ethephon effectively suppressed stem elongation and increased the yield of potatoes.

[0033]

EFFECTS OF THE INVENTION According to the present invention, an excellent effect of suppressing elongation of crops can be obtained. That is, the yield can be increased by suppressing the length of the crop.

Claims (1)

[Claims] 1. A method for suppressing growth of a crop, which comprises spraying natural abscisic acid and ethefone at the time of expansion of the stem or branch of the crop to suppress the growth.