JPS63233901A - Method for preventing freezing damage of agricultural crop - Google Patents

Abstract

PURPOSE:To prevent freezing damage of agricultural crops, by blending carrageenan with glucose, sucrose and glycerol in a specific proportion, further adding a nutrient supplementary agent or growth promoter to provide a base, dissolving the resultant base in water to form a coating solution and coating the surfaces of agricultural crops. CONSTITUTION:8pts. carrageenan extracted from red algae is blended with 43pts. glucose, 45pts. sucrose and 3pts. glycerol and then a nutrient supplementary agent) e.g. amino acid or nucleic acid) and a growth promoter (e.g. plant hormone cytokinin promoting growth of buds of agricultural crops) in an amount of preferably about 2pts. is added thereto to provide a base, which is then dissolved in 50-100pts. water to afford a coating solution (preferably a spreading solution is further added). Agricultural crops, such as green tea or vegetable, are subsequently coated with the resultant coating solution to form films and prevent freezing damage of the agricultural crops. When the agricultural crops are coated with the aqueous solution of carrageenan, the films are gradually cured with decreasing temperature to protect the agricultural crops from coldness without affecting growth thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for preventing frost damage to agricultural products such as tea and vegetables, and is particularly characterized in that it is applied to the surface of agricultural products.

(Prior Art) Every day's weather is not uniform as it can be sunny, rainy, or cloudy, and the amount of clouds and wind strength vary. As a result, the temperature varies from day to day. However, daily changes in temperature due to differences in weather are relatively small, within a few degrees at most, and the monthly and annual average values of temperature are almost the same as in previous years, but in winter and spring, the normal temperature changes. The temperature may drop suddenly beyond the range of change. When such a situation occurs, the leaves and flowers of agricultural crops are partially damaged, resulting in so-called frost damage. So conventionally.

Measures were taken to cope with the drop in temperature, such as generating a large amount of smoke and covering the farm with this smoke to reduce heat radiation from the ground, and covering crops with grass, etc. However, this method has the disadvantage that the former increases fuel costs and becomes less effective in the presence of even a slight wind; the latter requires a lot of manpower and is therefore limited to extremely small farms; It is not possible to accurately predict the day when the

Treatment must be taken even on days when the temperature does not drop.

For this reason, there has been a desire to develop a method for preventing frost damage that is inexpensive and long-lasting.

(Summary of the invention) The present invention provides that when an aqueous solution of carrageenan extracted from red algae is applied to agricultural crops, this coating film gradually hardens as the temperature decreases, protecting the crops from the cold, and not only affecting the growth of the crops. Taking advantage of the fact that this carrageenan does not give glucose or M&! It is made into a coating agent by adding lubricants, protective agents, nutrients such as amino acids, nucleic acids, and growth agents.

(Example) The present invention will be described in detail below. 8 parts of carrageenan extracted from red algae, 43 parts of grape N, 45 parts of sucrose, and 3 parts of glycerin are mixed together to create an amino acid that supplies nutrients to agricultural crops.

Add 2 parts of nucleic acid and a plant hormone, cytokinin, etc. that promotes the growth of buds of agricultural crops, and use this base as 5 parts.
The solution was dissolved in 0 to 100 times the amount of water, and a spreading solution was added thereto to prepare a coating solution, and this coating solution was sprayed onto new tea buds. As a result, the damage rate to tea shoots was suppressed to within 20% when the temperature dropped to 14°C, and this effect lasted for 7 days after spray application.

(Effects of the Invention) As detailed above, the present invention involves applying a coating solution containing carrageenan extracted from red algae as a main component to the leaves of agricultural crops, etc. ℃
When the temperature is below this level, it hardens and suppresses volatilization from crops, and at the same time suppresses the dissipation of heat generated by metabolism, thereby preventing crops from being damaged by cold air.

Claims (1)

[Claims] 5 to 15 parts of carrageenan, 40 to 45 parts of glucose, 40 to 45 parts of sucrose, and 1 to 4 parts of glycerin are mixed, and a nutrient supply agent and a growth promoter are added to this to form a base. A method for preventing frost damage to crops, which is characterized by dissolving this base in 50 to 100 times as much water to make a coating solution, and then applying this coating solution to the surfaces of leaves, buds, etc. of the crops to form a coating film. Method.