Water-land two-section type flue-cured tobacco strong seedling culturing technique

Abstract

The invention discloses a water-land two-section type flue-cured tobacco strong seedling culturing technique. The water-land two-section type flue-cured tobacco strong seedling cultivation technique specifically comprises the following steps of sowing pelletized tobacco seeds in a 392-hole polystyrene foam latticed plate filled by seedling culture mediums, culturing the seedlings on a water bed according to a floating seedling culturing rule, heeling the seedlings in a tray filled by nutrient soil when each tobacco seedling grows four leaves and one core, carrying out a series of measures of preserving heat in tunnels, shearing leaves, ventilating, and hardening seedlings by stopping watering and fertilizing, and finally transplanting the tobacco seedlings with eight leaves and one core in a field. The flue-cured tobacco seedling culturing method provided by the invention synthesizes the advantages of floating seedling culturing and nutrient soil tray seedling culturing to be complementary to each other, and has the advantages of production intensification, management standardization, consistency in tobacco seedling growth, less pest and disease damage, short recover period of tobacco seedlings, stronger tobacco seedlings, and simpleness and convenience in transplantation and the like.

Description

technical field [0001] The invention belongs to the technical field of tobacco cultivation and application, and in particular relates to a two-stage water-dry-dry stage cultivation technique for strong seedlings of flue-cured tobacco. Background technique [0002] Tobacco floating seedlings, as the main seedling technology for promoting industrialized seedlings and intensive production of tobacco in my country, has achieved great benefits. It is characterized by high production efficiency, well-developed root system of tobacco seedlings, uniformity, less disease occurrence and easy control; As the technology becomes more and more mature, many new problems are also exposed; the root system of floating seedlings is developed, the roots are many and long, and can reach more than 30cm; but this brings inconvenience to the transplanting of tobacco seedlings, and they grow in water for a long time, and the oxygen concentration in the water is insufficient , impedes the cell differen...

AI Technical Summary

Problems solved by technology

[0002] Tobacco floating seedlings, as the main seedling technology for promoting industrialized seedlings and intensive production of tobacco in my country, has achieved great benefits. It is characterized by high production efficiency, well-developed root system of tobacco seedlings, uniformity, less disease occurrence and easy control; As the technology becomes more and more mature, many new problems are also exposed; the root system of floating seedlings is developed, the roots are many and long, and can reach more than 30cm; but this brings inconvenience to the transplanting of tobacco seedlings, and they grow in water for a long time, and the oxygen concentration in the water is insufficient , impedes the cell differentiation of the root system, weakens the absorption function of the root system, has few root hairs, and poor root system vitality; most of the roots growing in water have poor adaptability to drought stress. Its physiological function will gradually die; in order to adapt to the new soil environment, the tobacco seedlings must re-grow new roots to absorb nutrients and water, which undoubtedly prolongs the field return period of the tobacco seedlings, resulting in slow growth and irregular growth of the tobacco plants in the early stage of the field

[0003] Although new seedling raising methods such as wet tray seedling raising, live plastic tray shallow water seedling raising, air whole root seedling raising, and two-stage floating seedling raising with less substrate have overcome the shortcomings of floating seedling raising to a certain extent, but in the long run, each still has its own shortcomings. Many deficiencies need further research and exploration; the whole air root seedling cultivation, because the water and nutrients needed for the growth of tobacco seedlings are provided by sprinkling irrigation, this will inevitably lead to high air humidity and a lot of water attached to the leaves. Disease outbreaks are prone to occur; the two-stage floating seedling cultivation with less substrate, although the amount of substrate is reduced, is still planted in the floating tray. After planting, there is still the shortcoming of a long seedling period; therefore, improving the root activity of tobacco seedlings and enhancing their drought resistance are one of the key factors that affect the promotion of floating seedling technology.