JP2673535B2 - Plant growth promotion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a compound represented by the general formula (I) (In the formula, R represents a lower alkyl group which may be the same or different.) As a concentration effective for promoting the growth of plants,
The present invention relates to a method for growing plants (excluding paddy rice) characterized by containing 0.1 to 100 ppm.

The compound represented by the general formula (I) of the present invention is disclosed in JP-B-47-
Known compounds described in 34126, among them, especially the compound of compound No. 15 as the general name isoprothiolane, rice plant entry inhibitory effect of blast fungus is strong, granules, wettable powders, powders, emulsions and the like. It is widely used under the trade name of "Fuji One". Among them, for example, granules contain 12% of isoprothiolane, but at a rate of 3 to 5 kg as a formulation in paddy fields under water control of a depth of 3 cm or more, for leaf blast 7 to 10 days before the first occurrence, On the other hand, it has been applied 10 to 30 days before the heading of panicles. In addition, isoprothiolane has the effect of preventing saplings (physiological acute withering injury) caused by imbalance between absorption and transpiration, such as a decrease in root water supply due to low temperature during rice seedling raising and an increase in transpiration due to high temperature. The above-mentioned granules are widely used at a rate of 50 to 75 g per seedling raising box (typically 30 × 60 × 3 cm) as a healthy seedling raising agent in the seedling raising box. In addition, isoprothiolane contains 500 to 5,0 per 10 are so that it acts from the roots of plants.
It is known that soil treatment at a rate of 00 g promotes root growth and eventually promotes growth of the entire plant (Japanese Patent Publication No. 61-24363).

The present inventors are conducting various studies on the physiological actions of compounds represented by the general formula (I) including isoprothiolane, and when isoprothiolane is applied to the roots of plants in the form of a dilute aqueous solution, the treated plants are treated. The present invention has been completed by finding that the growth is remarkably promoted as compared with the growth degree of untreated plants.

According to the present invention, for example, by treatment with isoprothiolane, increase in the number of leaves, elongation of plant height, enlargement of stem, activation of development and development of roots (promotion of rooting, increase of elongation amount, early rooting), It is recognized that physiological changes of the plant occur such as enhancement of vitality of the plant and reduction of withering of lower leaves. Further, treatment of the compound represented by the general formula (I) containing isoprothiolane increases salt tolerance or drought resistance of the plant, and the plant is exposed to harsh environmental conditions such as transient high salt concentration and dryness. Even if it is done, it is also recognized that physiological changes such as being surprisingly tolerated occur.

According to the present invention, therefore, the compound represented by the general formula (I) including isoprothiolane is in such a form and method as to be able to act on the roots of the plant to be treated, in an amount or concentration effective for promoting the growth of the plant. It is processed. Here, plants include vegetables such as leaf vegetables, fruit vegetables, root vegetables, etc. due to the physiological action of isoprothiolane; legumes; ornamental plants such as flowers and plants (eg chrysanthemum, potos, cyclamen, Saintpaulia, orchid, etc.), and salt-tolerant. In addition to the above, grain crops such as rice are also included in the utilization of sex and drought resistance. In the present invention, in order to effectively utilize such action of the compound represented by the general formula (I) including isoprothiolane, for example, a form of an aqueous liquid containing isoprothiolane in a concentration of 0.1 to 100 ppm (aqueous dispersion; (Including an aqueous dispersion of a wettable powder), and therefore typically isoprothiolane is applied in the form of an aqueous solution, although the plants are hydroponically grown, or well-soiled soil or In the case of controlled cultivation / growth to which water is given, a form soluble or dispersible in the water, for example, a solubilizer, an emulsion, a granule, or a wettable powder can be adopted. Since the water solubility of isoprothiolane is 48 ppm at 20 ° C., when using an isoprothiolane concentration within the range of such water solubility, it is also possible to use isoprothiolane itself.

When isoprothiolane having a concentration of about 0.1 to 100 ppm is used as the aqueous liquid, it can be prepared by dissolving the isoprothiolane drug substance in the case of an aqueous liquid having a concentration not higher than the water solubility thereof in view of the above-mentioned solubility. It can also be prepared by diluting the solubilizer or emulsion contained at a concentration.

As a treatment method, it is also convenient to fill an ampoule / bottle with an appropriate volume, invert it, and irrigate the soil. Isoprothiolane may also be applied mixed with phytonutrients. Isoprothiolane concentration is about 0.1-1
It is selected from the range of 00ppm according to the type of plant, growth condition, growth stage, growth environment, soil properties, weather conditions, etc. When applied to potted plants or potted plants (typically ornamental plants), it is advisable to irrigate the roots after rooting. For example, in a 4 to 5 inch pot (12 to 15 cm pot), an isoprothiolane aqueous solution of about 0.1 to 100 ppm, especially 4 to 40 ppm is filled in a 20 to 30 ml container (ampoule), which is inverted and then irrigated after planting. .

Typical examples and formulation examples of the present invention will be illustrated below, but the present invention is not limited thereto. In the prescription examples, “part” indicates weight.

Example 1 A tomato seedling (2 to 3 true leaves, plant height of about 10 cm) was fixed in a small pot on a water tank containing a culture solution prepared by adding a small amount of phytonutrient, and the root part was immersed in the water tank. Fix in the state.

Isoprothiolane was dissolved in acetone and applied to a water tank one week after planting so that the concentration in the culture solution would be the predetermined concentration, and then the culture solution in the water tank was renewed once a week to a solvent solution to which isoprothiolane was added at the predetermined concentration. . Until the time of renewal, a reduced amount of the culture medium (without isoprothiolane) was added every day.

 The results of the growth effect are shown in Table 1.

As shown above, in the isoprothiolane-treated area,
In the early stage (5/25), rooting was significantly promoted in each treatment group of 10 ppm, 1 ppm and 0.1 ppm compared with the untreated group, and the number of leaves and plant height increased with the passage of days thereafter. In the / 1 plot, the growth-promoting effect was remarkably exhibited in each part of tomato as compared with the untreated plant.

Example 2 25 ml prepared by adding a surfactant to prepare a solution so that isoprothiolane has a concentration of 5, 10, 20, 40, 80 ppm
Placed in an ampoule, put it upside down, planted a pot (4 inch) after rooting, irrigated chrysanthemum seedlings with soil, and observed for 3 months. It became remarkably vigorous, and both plant height and the number of leaves increased significantly.

In the treated area, 3 to 6 buds were worn, but in the untreated area, the growth did not proceed to such an extent that buds could be worn. It should be noted that, in the treatment section, it is 80 ppm though it is more visually observed in the 5-40 ppm section.
It was more prosperous than the ward.

Example 3 Tolerance to acute wilting due to osmotic shock Hogland hydroponic solution diluted 2-fold was placed in a glass bottle, and tomatoes (one or two true leaves, plant height 5 cm) were hydroponically cultivated. One week after the start of the hydroponic culture, the hydroponic solution containing isoprothiolane was replaced, and one week later, the hydroponic solution containing isoprothiolane was replaced. During this period, a hydroponic solution containing no isoprothiolane was replenished every two days.

Two weeks after treatment with isoprothiolane, 0.05, 0.1 and 0.2M
It was transferred to a NaCl-containing hydroponic solution, and the wilt state of the above-ground part was observed. The tomato seedlings immediately withered in the non-isoprothiolane-added group, reached a maximum after about 3 hours, and the extent was higher as the salt concentration became higher. On the contrary, in the present invention group, as shown in Table 2, it showed resistance to acute withering.

Example 4 Tolerance to acute wilting due to drying Tomato planted with a diameter of 10 cm (soil 1 kg) (4 true leaves)
And cucumber (real leaves 1-2) with isoprothiolane
Wettable powder containing 40% (by weight) (Fuji One: Nippon Pesticides Co., Ltd.)
0.25 g) was suspended in 25 ml of water and irrigated in pot soil. After the treatment, 25 ml of water was added to the pot twice a day for 3 days after the treatment, and then the water was stopped. In the chemical-untreated area, the wilting of the plants started 3 days after the watering was stopped, but in the isoprothiolane-treated area, the wilting was finally found 6 days after the watering was stopped.

Prescription example 1. Isoprothiolane 1.0 part Benzyl alcohol 2.5 parts Polyoxyethylene (16 mol) Nonyl phenyl ether (NPE) 10.0 parts Water balance The above mixture is uniformly mixed to form a 1% aqueous liquid, and the aqueous liquid is water to a predetermined concentration. To make an aqueous solution.

Prescription example 2. In place of benzyl alcohol in Prescription example 1, phthalic acid ester is used and mixed homogeneously to make a 1% aqueous solution. The aqueous solution is diluted with water to a predetermined concentration to obtain an aqueous solution.

Prescription example 3. Using HOC-40 (manufactured by Nikko Chemicals Co., Ltd.) in place of the NPE of prescription example 1 and uniformly mixing to make a 1% aqueous solution, diluting the aqueous solution to a predetermined concentration with water, Use as liquid.

Claims (4)

(57) [Claims] 1. The compound of the general formula (I) (In the formula, R represents a lower alkyl group which may be the same or different.) A compound represented by the following formula is applied to the root of a plant at a treatment concentration of 0.1 to 100 ppm to promote plant growth and enhance vitality. A method of growing plants (excluding paddy rice) characterized by the following. 2. The growing method according to claim 1, wherein the treatment form is an aqueous liquid. 3. The growth method according to claim 1 or 2, wherein the plant is a plant which is potted, boxed or hydroponically cultivated. 4. The growth method according to any one of claims 1, 2 and 3, wherein acute withering of plants due to osmotic shock or desiccation is reduced.