Avoid drastic changes in temperature and light. Chilling or freezing damage occurs in greenhouse vegetables. If the temperature is increased immediately after sunny, the temperature in the greenhouse will be too high, the mesophyll tissue will be damaged, and the leaves will dry out. Gradually increase the light, increase the temperature of the shed, and avoid excessive changes in the environment.
Strengthen fertilizer and water management. After the plant is chilled, do not water and topdress immediately. You can apply suspended calcium, rhizogens, etc. 3 to 4 days after the weather improves, and cooperate with high nitrogen total water-soluble fertilizer to promote root regeneration. Also pay attention to foliar topdressing and leaf function recovery.
Control pests in time. After chilling damage, the disease resistance of vegetables is reduced, which is prone to cause disease epidemics. Attention should be paid to timely disease control. Fungi and other diseases that are mainly transmitted through the air can be fumigated with air disinfection tablets to reduce the spread of germs.
Preventing phytotoxicity:
Due to the poor photosynthesis of vegetable leaves over a long cloudy day, even photosynthesis cannot be performed. As a result, the vegetable leaves become thin, yellow and tender, the fibrous tissue is weak, and the drug resistance is poor. At this time, spraying the pesticide can easily cause damage to vegetables. Therefore, don't rush to spray after cloudy weather suddenly clears, it is best to spray again after 1-2 days.
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