In order to avoid thin seedlings. Excessive humidity is one of the important reasons for the occurrence of damping-off. Therefore, appropriate humidity should be controlled during the seedling period. Irrigation should be suitable before sowing, if it is too large, the humidity will be high and the soil temperature will be lowered; if it is too small, the number of waterings will be increased during the seedling period, which will not only be laborious but also increase the humidity. In the initial stage of emergence, the sill can be sifted on the bed 1 or 2 times to protect the floor and make up for cracks in the ground.
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