First, wearing a cap
When the cotyledon is unearthed, the belt is taken out of the soil, like a hat on the top of the cotyledon, which affects the normal development and photosynthesis of the cotyledon. The reason is that the bed soil is too dry and the soil is too thin. Preventive measures are: seedbed bottom water to be poured enough, cover the thickness of the soil to be appropriate, generally 1 ~ 1.50 cm small seed cover soil, medium grain seed 1.50 ~ 2 cm, large seed 3 ~ 4 cm. Before sowing until emergence, the bed covers the mulch to keep the soil moist.
Second, the rigid seedlings
There are two reasons for this:
1 In early spring, the air was cold, the soil temperature of the seedbed was low, and the roots developed slowly to form rigidified seedlings;
2 In the later stage of nursery, in order to prevent the seedlings from growing in length, the method of watering or not watering is used. As a result, the root system of the seedlings is severely affected by drought and forms rigidified seedlings. Preventative measures: The preventive measures are to increase the seedbed temperature in the early stage and promote Root development. In the late period of nursery, if the seedlings are grown, the seedbed temperature should be lowered, the light intensity and illumination time should be increased, the ventilation should be increased, and no watering or watering methods should be adopted to control the seedlings.
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