As the saying goes, "Miao is a good half of tobacco smoke." It can be seen that the quality of tobacco seedlings is the most important factor determining the level of tobacco cultivation. The floating seedlings currently used in production are to cultivate smoke seedlings that meet the standards, and lay a good foundation for the normal growth and development of tobacco plants in the middle and later stages and to obtain high-quality tobacco leaves. According to the production experience, the floating seedling seedling management must grasp the following aspects:
Seedling protection
The early seedlings are tender and small, have poor resilience, and are vulnerable to low temperature hazards. Insulation, moisturizing, wind protection, flood prevention, and frost prevention are the key measures in the early stage of nursery. After sowing the spring smoke, the film must be sealed and the temperature and moisture in the bed must be maintained so that the seedlings can emerge as soon as possible. After two true leaves of the seedlings, as the temperature rises, ventilation and dehumidification are required, otherwise the seedlings will burn easily and spots or plaques will appear. On sunny days, the two ends of the membrane are generally ventilated from 8 am to 5 pm and the temperature is controlled within 35°C. Seedlings in four true leaves, ventilation and dehumidification time to be extended, such as the temperature continues to rise after the opening of both ends, to increase ventilation. During the vertical leaf stage of the tobacco seedlings, the two ends of the film were uncovered in the morning and in the afternoon. At the same time, the side of the film was to be uncovered at noon, and ventilation was used to carry out hardening.
Watering
The film covers the nursery for seedlings. When the seedlings are sowed before sowing, no watering is required during the seedling stage. When no film is used to cover open-air nursery, the seedlings should be sprayed on a daily or alternate day so that the soil is always in a moist, soft state. The number of spraying of tobacco seedlings during the cross period can be appropriately reduced, and the amount of watering can be appropriately increased. After the vertical leaf stage, the size of the tobacco seedlings and the soil moisture content should be sprinkled with water or appropriate amount of irrigation. The seedling stage is usually dominated by water-cutting seedlings, and no drought or water is used. To improve the resilience of tobacco seedlings. Areas with more rainwater should be drained in time. During the entire nursery process, there should be no water accumulation in the seedbeds.
Fertilizer
Seedbed fertilization is dominated by basal fertilizer supplemented by topdressing. Top dressing should be applied as appropriate according to the growth condition of the tobacco seedlings, and the base fertilizer may not be chased when sufficient. For top dressing, compound fertilizer is preferred. Before the third true leaf appeared, it was the most sensitive to ammonia nitrogen, and top dressing must be cautious. The amount of nitrogen fertilizer is 5-10 grams per square meter, and the amount should not be too large. After chemical fertilizers are sprayed, the seedlings must be rinsed with clean water to prevent fertilizer damage.
Seedlings weeding
The emergence of 3, 4 and 5 true leaves of the young plant was carried out 3 times. The last time the seedling was the fixed seedling, and the seedling distance was generally 6-8 cm. Timely weeding is conducive to ventilation and prevention of pests and diseases, reduce the waste of fertilizer and water, weeding is usually carried out in conjunction with the seedlings.
The leaves
Loquat leaf is a powerful measure to promote the growth of tobacco seedlings. The leaves of lower yellow leaves and leaves with yellow-green color and poor physiological function should be promptly removed, and the upper part of the leaves with strong physiological functions should be removed. Loquat leaves are conducive to ventilation and light transmission, which can inhibit the growth rate of tobacco seedlings. It is an effective measure to regulate the growth rate of tobacco seedlings and prevent it from becoming obsolete.
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