Seedbed temperature is maintained at 25-30°C during the day and 18-20°C at night, with relative humidity of 70-85%. After 50% emergence, gradually remove the mulch or small shed. From the seedlings to the sub-seedlings, management should be properly ventilated, increase lighting, and carry out cooling management. The daytime temperature should be 22-26°C and nightfall should be 13-14°C. 3-5 days before seedlings, appropriate cooling and hardening of seedlings are carried out. During the day, the temperature is maintained at 20-22°C and kept at 8°C or more at night. The seedlings can be divided into seedlings when they are dark green or slightly purplish. After sub-seedling, the bed temperature should be increased and the seedlings should be promoted. The temperature should be maintained at 25-28°C during the day and 17-18°C at night. After cooling the seedlings, the temperature should be controlled to promote flower bud differentiation, during the day, 23-25°C and 13-15°C during the night. At the same time, cover the grass and dust on the film as soon as possible and cover the polyester film on the north side of the seedbed. , Try to extend the lighting time and increase the light intensity.
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