Cold-resisting agent for tobaccos as well as preparation and usage methods of cold-resisting agent

Abstract

The invention discloses a cold-resisting agent for improving cold resistance of seedlings of tobaccos as well as preparation and usage methods of the cold-resisting agent. The cold-resisting agent comprises main components as follows: 1.15-2.30 g / L of glycine betaine, 5.0-10.0 mg / L of salicylic acid, 3.0-5.0 mg / L of abscisic acid and 600-1,000 mg / L of 5-aminolevulinic acid. The agent is sprayed to leaf surfaces in the seedling recovering period and the root extending period before outplanting of the seedlings of the tobaccos or after land transplantation of the seedlings of the tobaccos, the agent is sprayed after the original agent is diluted by 3-5 times, and 25-30 L of the agent is sprayed per mu. The agent is a cold-resisting leaf surface spray agent prepared from physiological activity regulating substances, can effectively improve the resistance of shoots (the seedlings) of the tobaccos to low-temperature adverse situation, can better cope with low-temperature damage of birth blockage (and even early blossoming) of the seedlings of the tobaccos due to frequent late spring coldness in main southern tobacco producing areas, has no adverse effect on the quality of flue-cured tobaccos and has bright application prospect in tobacco production.

Description

technical field [0001] The invention belongs to the technical field of tobacco resisting low-temperature adversity and inhibiting the occurrence of "early flowering", and specifically relates to a cold-resistant agent for improving the cold resistance of tobacco seedlings and a preparation and use method thereof. Background technique [0002] Tobacco is a temperature-loving crop native to the subtropical zone (the optimum temperature for growth is 25-28°C, growth stops at 10-13°C, and seedlings die at a low temperature of 1-2°C). Fertility, yield and quality are significantly affected. Tobacco areas in my country are widely distributed, and the temperature conditions vary greatly. For example, the southern tobacco areas frequently suffer from "cold spring", which leads to poor growth of tobacco plants in the "returning seedling stage and rooting stage" and induces the occurrence of "early flowering", which seriously affects the yield of tobacco leaves. And quality, has also ...

AI Technical Summary

Problems solved by technology

At present, the main varieties such as K326 and Yunyan 87 promoted in production have relatively good comprehensive traits, but their tolerance to low temperature environments is poor

[0003] Aiming at the practical problem of the frequent "cold spring" that plagues tobacco production, the lack of germplasm resources required to breed new varieties of low-temperature tolerant tobacco through genetic improvement, the breeding cycle is long, and requires a lot of manpower, material and financial resources, which is strategic measures; and improving the low temperature tolerance of tobacco plants through agronomic measures such as spraying tobacco low temperature tolerance regulators is an effective measure and method to deal with the harm of "cold spring" in early spring in tobacco production

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