JPH11199417A - Plant growth promoter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a plant growth promoter intended to promote plant growth and improve the resistance to diseases of plants by mixing a chitosan solution with an aqueous extract of humic acid. SOLUTION: This plant growth promoter is obtained by mixing a chitosan solution prepared by dissolving chitosan in a weakly acidic organic acid with an aqueous extract of humic acid. By using this promoter, marked effects can be afforded in plant growth promotion, improvement in the resistance to diseases of plants, harvest increase, and soil modification and so forth.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant growth promoter which promotes plant growth and improves disease resistance by using a mixed solution of a solution of chitosan and an aqueous extract of humic acid.

[0002]

2. Description of the Related Art As a result of the development and extensive use of many chemically synthesized pesticides, many problems such as reduced plant disease resistance and pesticide residues have been highlighted. Therefore, in order to address these problems, for example, chitosan obtained by de-acetylation of chitin, which is a high-molecular polysaccharide, was confirmed to be quite effective in promoting plant growth and improving disease resistance. Its practical use has been promoted.

[0003]

However, in the case of chitosan, since it is a high-molecular-weight polysaccharide, chitosan may block the stomata of the leaves of the plant. Is naturally limited,
There is a drawback that many effects cannot be expected for promoting plant growth or improving disease resistance.

[0004]

Accordingly, in order to solve the above-mentioned problems, the present invention provides a method for producing a mixture of a chitosan solution obtained by dissolving chitosan in a weakly acidic organic acid and an aqueous humic acid extract. By comprising a growth promoter, a remarkable effect is exhibited for promoting plant growth and improving disease resistance.

[0005]

Therefore, in the present invention, chitosan must first be dissolved in a weakly acidic organic acid in order to dissolve and use it. Examples of the weakly acidic organic acids include acetic acid, citric acid, and lactic acid. From the viewpoint of plant safety, brewed vinegar containing acetic acid as a main component, which is generally used for food, is used. Seems to be optimal. The brewed vinegar in this case is defined by the Japanese Agriculture and Forestry Standards (JAS). The method for producing vinegar is mainly made of milled rice or the like, and brewed rice koji (mainly yellow koji,
Aspergillus oryzae) or starch-degrading enzyme (Amylas) or edible vinegar brewed in combination with them is called brewed vinegar.

[0006] The above brewed vinegar includes grain vinegar and fruit vinegar,
Rice vinegar or the like specified by the Japanese Agriculture and Forestry Standards (JAS), and a mixture of only one of these brewed vinegars or a mixture of several such vinegars may be used as a solution for chitosan.

[0007] In the present invention, humic acid is a soil containing a large amount of corrosive substances that have been specifically deposited in the soil, having an estimated molecular weight of tens of thousands or more, and having a yellow-brown or red-brown or black-brown amorphous form. It is a high molecular weight organic acid.

The aqueous humic acid extract used in the present invention refers to an aqueous solution of humic acid, after air-drying the humic acid, placing the dried humic acid in an aqueous solution, and standing at room temperature for about 3 days with occasional stirring. Is referred to as an aqueous humic acid extract.

Next, specific examples of the method for producing the plant growth promoter of the present invention will be described with reference to examples.

[0010]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
First of all, the method of preparing the solution of chitosan is described as a brewed vinegar, trade name "Red Red Vinegar" (manufactured by Red Red Vinegar Honpo)
1.5 kg of brand name “Chitosan CLH” (deacetylation degree: about 85%, molecular weight: about 1,000,000, manufactured by Yaizu Fisheries Chemical Industry Co., Ltd.) is dissolved in 27 liters while stirring little by little, and defoaming work is performed twice in the middle. 1 week at room temperature (average about 2
(5 ° C.), and allowed to settle to obtain a chitosan solution in which chitosan was dissolved.

Next, the method for preparing the aqueous humic acid extract will be described. First, humic acid is collected in Miyazaki-gun, Miyazaki Prefecture and air-dried for about 3 days. 500 liters of water heated to a temperature of 300 ° C., and stirred several times a day at room temperature for 3 days (average about 25
C.) and 450 liters of aqueous humic acid extract was obtained by sequentially pumping only the supernatant.

Next, 480 liters of the plant growth promoter which was the object of the present invention was obtained by mixing 26 liters of the chitosan solution in which the chitosan was dissolved, 110 liters of aqueous humic acid extract, and 344 liters of water.

Next, application examples of cultivating various vegetables using the plant growth promoter of the present invention will be described below.

[Application Example 1] Mr. A who lives in Tano-cho, Miyazaki-gun, Miyazaki Prefecture,
In September 1996, planted radish seeds on a 90 acres planted area,
It was cultivated as follows. First, at the stage when radish has grown to some extent, the plant growth promoter of the present invention is diluted 100 times with water, and at a rate of 1000 liters per 10 ares, on November 15, December 4, and December of the same year. 13
The leaves were sprayed four times on the day and on December 23, respectively.

As a result, the damage to the radish leaves by the insect pests was prevented, and the occurrence of the yellow rot, which had occurred up to the previous year, was prevented. In addition, the product standard grade in the radish sorting,
It was confirmed that compared to the case of the previous year in which the plant growth promoter of the present invention was not sprayed at all, the yield was increased by 0.5 point, and the yield per 10 ares was also increased by 40% from the previous year.

Next, on a vacant lot after the radish was harvested on March 4, 1997, a liquid obtained by diluting the plant growth promoter of the present invention 50-fold with water at a ratio of 1,000 liters per 10 ares. The soil was sprayed, and the topsoil (cultivated soil) was plowed with a tractor on March 6, the same year.

Next, in order to cultivate potatoes on the above-mentioned cultivated land, potato (make-in type) seed potatoes were immersed for 24 hours at room temperature (23 ° C.) in a solution obtained by diluting the plant growth promoter according to the present invention 80-fold with water. The potatoes of the potato (make-in type) for comparison and not immersed in the diluent at all were planted on the vacant land cultivated by a tractor on March 18, the same year.

As a result, the growth height of the stem after germination was examined on April 7, the same year. As a result, the growth height of the stem after germination of the potato immersed in the diluted solution of the plant growth promoter of the present invention was as follows: While the average height was 28 cm, the growth height of the potato stems not immersed in the same diluent was 15 c on average.
m, it was found that the growth height of the stem after germination was nearly doubled when the plant growth promoter was used.

[0018]

[Application example 2] Mr. B, who lives in Ose Town, Miyazaki City, Miyazaki Prefecture,
In October 1996, cucumber seedlings were planted in a 20-are planted area using a plastic greenhouse (two in a row of six). afterwards,
Disease started in December of the same year (Disease name: gray mold,
Due to the sheath blight, a chemically synthesized pesticide (powder) was sprayed on December 2, the same year. However, the next day, the cucumber began to wither from the lower leaves and spread throughout the house. So the same year 12
On April 4, the plant growth promoter of the present invention was diluted 100-fold with water, and 8,000 liters per 10 ares were sprayed on the leaves of the entire house at a rate of 8,000 liters.

[0019] The seedling bed soil for the new cucumber provided in the vinyl house, the diluted solution 1 m ² per 20
0 ml was sprayed. As a result, the cucumbers that once produced dead leaves as described above are reactivated in the upper part of the middle tier, and are sequentially shipped until the end of the year, to other cucumber growers who did not use the plant growth promoter according to the present invention. In comparison, the shipment amount was 30% or more, and a better result than before was obtained. Cucumbers of other house farmers were also severely damaged by the chemical damage caused by synthetic pesticides (powder),
In the case of Mr. B, there was no effect at all.

Next, the above cucumbers were prepared on January 8, 1997
On January 9, the harvest was completed and removed, and new seedlings of cucumber were planted again. However, on January 11 of the same year, a large number of pests (thrips) were generated, and the leaves were damaged. Therefore, the plant growth promoter of the present invention was diluted 80-fold with water and sprayed on leaves at a rate of 600 liters per 10 ares.

However, since the larvae and eggs of thrips were again confirmed on the shoulder of the cultivated soil ridge, the plant growth promoter of the present invention was diluted 100-fold with water, and 4 per 10 ares.
The soil was sprayed at a rate of 00 liters three times on January 13, January 16, and January 18, the same year.
As a result, the extinction of Thrips was confirmed on January 22 of the same year, and the cucumber tree's vigor recovered again. The cucumber harvesting started on February 20 of the same year, and from February 25 to 3 of the same year.
During the period of March 10th, first-class products were mainly harvested.

Thereafter, in order to increase the yield and growth of the cucumbers, the plant growth promoter of the present invention was diluted 100-fold with water and sprayed on the leaf surface and soil at a rate of 800 liters per 10 ares. March 10 to March 2 of the same year
On the 5th, the mold continued to grow on the rainy day, and many flower-flower bends occurred in the house due to a decrease in root activity due to lack of water.

Therefore, the plant growth promoter of the present invention was diluted 100 times with water, and the leaves were diluted three times on March 27, March 29 and April 1 of the same year at a rate of 800 liters per 10 ares. Sprayed on the surface and soil respectively. As a result, it was confirmed from around April 3 of the same year that the bending of the flower gan was eliminated and that the mold disease was completely cured, and that the plant growth promoter was not used in comparison with the conventional case in which the plant growth promoter of the present invention was not used.
The yield of grades increased, and good results were obtained.

[0024]

As described above, the present invention provides a plant growth promoter comprising a mixture of a chitosan solution obtained by dissolving chitosan in a weakly acidic organic acid and an aqueous humic acid extract. Promote growth, improve disease resistance, increase yield,
Many remarkable effects are exhibited, such as soil modification, and it can be safely used in food hygiene.

Claims (1)

[Claims] 1. A plant growth promoter comprising a mixture of a chitosan solution obtained by dissolving chitosan in a weakly acidic organic acid and an aqueous humic acid extract.