During the cultivation of winter stubble greenhouse vegetables, if the environmental conditions can not keep up or are not managed properly, various abnormal growth phenomena often occur in the seedlings. Experts have proposed that scientific management should be carried out for different situations.

Beware of unearthed with skin: In order to prevent unearthed with skin, soil should be covered evenly during sowing to ensure proper soil temperature after sowing. In addition, when the seedlings are just unearthed, if the bed soil is too dry, you can spray a small amount of water to keep the bed soil moist. If you find that the soil is too thin, you can add a layer of wet fine soil. It is found that there are seedlings unearthed from the skin. The seed coat can be softened by spraying water, and then the seed coat can be removed manually.

Decrease rotten seedlings: rotten seedlings are related to the quality of the seeds. Immature seeds, mildew during storage, and burns during soaking can cause rotten seeds; in addition, low temperature and high humidity after sowing, application of unripe organic fertilizer, and excessive time for seed excavation , Long-term exposure to hypoxia is also prone to rotten species. In view of the above, control the nursery environment and reduce rotten seedlings.

Avoid roots: roots are mainly caused by the soil temperature of the seedbed below 12 ℃ for a long time, coupled with excessive watering or cloudy days, and insufficient light, which causes the roots of the seedlings to develop under low temperature, excessive humidity, and hypoxia, resulting in 沤root. The soil temperature should be increased (soil temperature should be kept above 16 ℃ as far as possible), and the bottom water should be used once when sowing, and the water should be properly controlled during emergence to prevent excessive wetness on the bed.

Controlling length: the length of the shoots is too long, the stems are thin, the fibrous roots are few, the resistance to stress is poor, the seedlings are slow after planting, and it is not easy to obtain early maturity and high yield. Insufficient light, excessive night temperature, too much water and nitrogen fertilizer can easily cause seedlings to grow too long. It can be prevented by management measures such as increasing light, maintaining a proper temperature difference between day and night, moderate water supply, and timely seedling division.

Prevent aging: after planting, aging seedlings grow slowly, flowering and fruiting later, the fruiting period is short, and premature senescence is easy. The cause of aging seedlings is caused by long-term lack of water or low temperature in the seedbed, improper hormone treatment, etc. When raising seedlings, care should be taken to prevent long-term low temperature, excessive water shortage and unscientific use of hormones.

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