JPH0386803A - Plant growth regulator-containing water absorbing polymer preparation and its use - Google Patents

Abstract

PURPOSE:To gradually absorb water and chemical in plants by spreading a water absorbing polymer preparation, prepared by coating a water absorbing polymer with a plant growth regulator, over soil during seeding, transplanting and growing of plants or applying to plants, then sprinkling water and retaining water in the preparation. CONSTITUTION:An aqueous solution or a mixed solution containing an organic solvent such as methanol having dissolved a plant growth regulator (e.g. auxins or gibberellin) is absorbed in powder, powdery granule or granule (e.g. starch/ acrylate graft polymer or crosslinked carboxymethyl cellulose) of water absorbing polymer which is dried and ground or dried while spraying the aqueous solution to give the title water absorbing polymer preparation. The amount of the plant growth regulator contained in the preparation is preferably 0.0002-0.01wt.% based on the water absorbing polymer. The amount of the preparation used is preferably 0.1-5% in the case of blending with dried soil, 10-200kg/10a in case of field and 0.1-200g per stock in application to root.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a water-absorbing polymer preparation in which a water-absorbing polymer is coated with a plant growth regulator, and a method for regulating plant growth using the same. It is effective for

<Prior art> Regarding the use of water-absorbing polymers for the purpose of water retention, Japanese Patent Application Laid-Open Nos. 11721-1982, 11722-1980,
JP-A No. 56-8619, “Chemical regulation of plants J (V
ol, 17° 1982, No. 2 153 156).

However, the present invention relates to an aqueous polymer preparation comprising a water-absorbing polymer and a plant growth regulator, and such a water-absorbing polymer has not been known in the past.

<Problem to be solved by the invention> Water is absolutely essential for the growth of plants, but
Water supply to plants is often insufficient due to weather conditions or human factors.

The present inventor believes that if the water given to the plants during the -times of watering is gradually used in small amounts together with the plant growth moderation agent, the plants can be cultivated sufficiently even if the number of waterings is reduced. As a result of extensive research, we have discovered the water-absorbing polymer formulation of the present invention, believing that it can be carried out easily and also lead to savings in water and labor.

<Means for solving the problem> In other words, the present invention uses water-absorbing polymers for plant growth! I1w
A water-absorbing polymer preparation characterized in that it is coated with a plant growth agent, and a water-absorbing polymer preparation in which a water-absorbing polymer is coated with a plant growth moderator are sown in the soil around the plant at the time of sowing, transplanting, or growing the plant. Either by mixing it with the soil or by applying it to the plants, and then spraying water on it to make the preparation retain water, and the retained water and plant growth! 1llIf
Plant growth characterized by allowing the plants to simultaneously and gradually absorb the f agent! 1liflff method.

The present invention will be explained in detail below.

The water-absorbing polymer used in the present invention is a polymeric substance that is sparingly soluble or virtually insoluble in water, and means one that absorbs a large amount of water and swells when it comes into contact with water. The water absorption capacity is better as it is larger, but usually it is sufficient as long as it absorbs 50 times or more of water, preferably 100 to 1500 times the weight of the water-absorbing polymer. Examples of such water-absorbing polymers include starch/ Acrylate graft polymer, carboxymethylcellulose crosslinked product, vinyl alcohol/acrylate copolymer, polyacrylonitrile hydrolyzate, crosslinked polyacrylate, modified polyvinyl alcohol, crosslinked polyethylene oxide, vinyl-monomethyl maleate copolymer , isobutylene-maleic anhydride copolymer, and the like.

The plant growth regulator used in the present invention refers to various physiological phenomena of plants such as germination, growth, rooting, flowering, fruiting, ripening,
Refers to chemical substances that promote fruit discoloration and leaf fall, such as auxins (TAA, 4-chloro-IAA, 2
．． 4-D, 5.6-dichloro-IAA, methyl or ethyl ester of 5.6-dichloro-IAA, NAA
) Gibberellins, cytokinins, abscisic acid, zuracinosteroids! IV (brassinolide, epibrassinolide, homobrassinolide, etc.) and other synthetic organic chemicals are not particularly limited as long as they are involved in the physiological phenomena of plants; Contained in drugs. ("IA'A" means indole acetic acid. The same applies hereinafter.) These plant growth regulators can be used as is, dissolved in water-soluble organic solvents such as methanol, ethanol, dimethylformamide, etc., or used as ordinary agricultural chemicals. It can also be used by mixing it with a dispersant, a spreading agent, an emulsifier, and a fixing agent to form a formulation.

The method for producing the water-absorbing polymer preparation of the present invention will be explained below.

It is produced using water-absorbing polymer powder, powder or granules, a plant growth regulator, water, and a water-soluble organic solvent, in detail, by the following methods (1) to (2).

■ A water-absorbing polymer is made to absorb an aqueous solution (or a mixed solution containing an organic solvent) in which a plant growth regulator is dissolved, then dried and pulverized.

(2) An aqueous solution (or a mixed solution containing an organic solvent) in which a plant growth regulator is dissolved in a water-absorbing polymer is dried while being sprayed to obtain a water-absorbing polymer preparation of the present invention.

In addition, in the method (2) above, the water-absorbing polymer preparation of the present invention having a desired particle size distribution can be obtained by discarding the powder using a suitable sieve after pulverization.

In addition, in the method (2), the water-absorbing polymer preparation of the present invention in the form of powder, granules, or granules can be obtained by using a water-absorbing polymer having a desired particle size distribution in advance.

The water-soluble organic solvent used in the production of the present invention is methanol,
Examples include alcohol solvents such as ethanol, dimethylformamide, dimethyl sulfoxide, etc., and these are selectively used depending on the solubility of the plant growth met agent or the method of the coating process (methods 1 to 2 above).

The content of the plant growth regulator contained (coated) in the water-absorbing polymer preparation of the present invention is usually 0.00001 to 0.1% (weight), preferably 0.0002 to 0.1% (by weight) based on the water-absorbing polymer. It is 0.01% (weight).

・When using the main rule by mixing with dry soil or artificial clay, add 011 to 5 of the formulation of the present invention per dry soil or artificial clay.
It is desirable to mix well within the range of %.

・10 to 200 kg per 10 a when used in fields
It is desirable to use within the range of .

- When used as a root application for transplanted seedlings and crops, the amount is in the range of 0.01 to 500 g per plant, preferably 0.1 to 200 g, although it varies depending on the size of the crop.

<Examples> The present invention will be explained with reference to the following examples.Formulation Example 1: ethanol (2: 1) Add 30 parts of the mixture and stir thoroughly. After the mixture was completely absorbed, it was dried and ground to obtain an absorbent polymer preparation of the present invention containing 0.0004% gibberellin.

Formulation Example 2 Water-absorbing polymer (Boys 5A-20, Kao Corporation product)
Water/ethanol (2:1
) Spray 15 parts of the mixture and repeat drying to coat with NX.
A water-absorbing polymer formulation of the present invention containing -8280.004% was obtained.

Formulation Example 3 100 parts of water-absorbing polymer (Kl Gel 201, manufactured by Kuraray Co., Ltd.) and 0.004 parts of BA (benzyladenine)
0.004% BA
A water-absorbing polymer formulation of the present invention containing the following was obtained.

Test Example 1 Germination promotion effect test by soil mixing treatment The preparation of the present invention was thoroughly mixed with dry soil to a concentration of 0.25% and 0.5% per granular soil to prepare treated soil. A predetermined amount of these soils was packed into a plastic pot with an inner diameter of 9C11 and a depth of 12 cm, and a predetermined number of rice plants were sown.

After the treatment, water was supplied from the bottom of the pot (a hole was made in advance) in order to equalize the soil moisture between the pots. Thereafter, in order to clarify the effect under dry conditions, under irrigation was similarly performed after doubling for one week.

After sowing, the germination status was investigated over time.The test was conducted in five consecutive series, and the results shown in Table 1 were obtained. It showed a remarkable germination promoting effect.

Table-1 Rice germination promoting effect by soil mixing treatment Dose of drug* Formulation g/granular soil g Germination status over time** 5th day after sowing 100th day after sowing Bererin 0.25% 0.0OO04%g Rimmer wI O , 5% Gibberellin 0.25% 0.0004U Limar-1 Jiri Ili 0.5% Gibberellin o, ooooα granules 0.25% 0°5% Gibberellin o, oooo4x granules 0.25% 0.5% Polymer 0.25% 0.5% No treatment 0 0 *Application concentration per granular soil (g/g) **Germination rate per pot (%) Test Example 2 Growth promotion effect by soil mixing treatment Same as Test Example 1 Prepare treated soil with an inner diameter of 10C11 and a depth of 15C.
A predetermined amount was packed into a +s plastic pot, and a predetermined number of Japanese radish were sown.

Water supply after seeding was in accordance with Test Example 1. On the 32nd day after treatment, a 0 test was conducted to measure the dry weight of the ground in 6 consecutive series.
As shown in Table 2, the preparations of the present invention such as 5,6-dichlor IAA (hereinafter referred to as NK-828) and benzyladenine (hereinafter referred to as BA) clearly showed a growth promoting effect.

Table 2 Growth promotion effect by soil mixing treatment Drug dosage *Preparation g/granular soil g Ratio to untreated specific dry weight (%) 5.6-dichloro rAA O, 0004X11v-jllJIJ o, 25% 0.5% BA O,004u Limar-1j1lJ 0.25% 0.5% Control 5.6-dichloro IAA o, ooc+4x Granules 0.25% 0.5% BA 0.25% 0.004X
Granules 0.5% Polymer 0.25% 0.5% Untreated*Drug Amount: Concentration per granular soil (g formulation/g granular soil) NK-8
287'5.6-dichloroindoleacetic acid BA: Penzyladenine Test Example 3 Rooting and growth promotion effect by root treatment of transplanted seedlings Cabbage seedlings (4 to 6 leaves) were grown on a commonly used seedling mat (5 cm x 5 cm). After growing, these seedlings were removed from the mat at the time of treatment, and the roots were treated with a predetermined amount of the formulation of the present invention. After the treatment, appropriate fertilizer was applied to plastic pots with an inner diameter of 18 CI and a depth of 15 CI, and these treated seedlings were transplanted (1 plant/pot). Water was supplied from After that, in order to create dry conditions, the same watering test was conducted once a week in a series of 6 consecutive times, and on the 7th day after transplanting, the seedlings had taken root.
On the 20th day, the drying chamber above ground was measured.

In this test, the results shown in Table 3 were obtained.As shown in Table 3, the preparation of the present invention exhibited high rooting and growth promoting effects.

Table-3 Rooting and growth promotion effect BA of transplanted seedling root treatment 0.0004X Granules 0.5 + 19 +: Slightly better than no treatment.

＋＋：＃　　　　　・ 10+-1s Extremely superior.

Note 2) IBA: Indolebutyric acid NAA: Naphthalene acetic acid Test Example 4 Root treatment at the time of turfing to promote rooting and growth.
After adjusting the test material (block) to 0C11 x 50C11 squares, a predetermined amount of the formulation of the present invention was applied to the roots of these blocks. After treatment, these grasses were spread on fields that had been leveled and moderately fertilized. After the turf was attached, the rooting status was investigated over time. This test was conducted in triplicate, and the results shown in Table 4 were obtained.

As shown in Table 4, the formulation of the present invention showed remarkable effects compared to conventional granules and untreated formulations.

Table-4 Rooting and growth promotion effect g/B by treatment of the front root of turf
lock IO daily fever day 0 day 30 5.6-dichloro IAA O,0O04X polymer 81 + +++ +++++++
+++ +++ 5.6-dichloroIAA O,0004χ Granules + Polymer + + No treatment Note 1) Katsuki Kinuta Kashikuni + ++ +++: Same as no treatment.

: Slightly better than untreated.

: Better than no treatment.

: Extremely superior to no treatment.

Test Example 5 Adherence and growth promotion effect by application to roots of transplanted still trees Three-year-old cypress seedlings were sufficiently watered before treatment with chemicals, and then the roots were treated with a predetermined amount of the formulation of the present invention.

After treatment, leave the equipment for several hours and apply appropriate fertilizer in advance.
These seedlings were transplanted into a cleared field. After transplantation, the growth promotion effect of the seedlings was examined on the 60th day over time. This test was conducted in 10 consecutive series, and the results shown in Table 5 were obtained.

As shown in Table 5, the formulation of the present invention exhibited extremely high rooting and growth promoting effects compared to ordinary granules and untreated formulations.

Table-5 Effects on rooting and growth promotion by root treatment of cypress seedlings Drug Amount Rooting promotion effect Growth promotion effect 87
14th day 28th day 60 days heat treatment Note 1) Dry Shark Division; - and growth promotion 10 effects ++ +++: Same as no treatment: Slightly better than no treatment.

: Better than no treatment.

: Extremely superior to no treatment.

Note 2) Growth of cypress during treatment Plant height: 4 hours Stem size: Approximately 2 cm in diameter Note 3) BA: India-No-Kyushun <Effect of the invention> As is clear from the above test examples, the water-absorbing polymer of the present invention The preparation shows excellent rooting and growth promoting effects.

Claims (2)

[Claims] (1) A water-absorbing polymer preparation characterized by coating a water-absorbing polymer with a plant growth regulator. (2) A water-absorbing polymer formulation in which a water-absorbing polymer is coated with a plant growth regulator is sown in the soil around the plant, mixed with the soil, or applied to the plant at the time of sowing, transplanting, or growing the plant. 1. A method for regulating plant growth, which comprises making the preparation retain water by spraying water on the water, and simultaneously and gradually absorbing the retained water and the plant growth regulator into the plant.