Disaster weather vegetable production management

One is to control water and dehumidify to reduce air humidity. Continuous cloudy days, it is necessary to strictly control the amount of water, little or no pouring, watering interval should be properly elongated, should be shallow water irrigation or drip irrigation is appropriate. Cover the mulch in the shed to reduce the evaporation of soil moisture. Ventilation is generally preferred at high temperatures at noon. When the ventilation effect is poor, natural moisture absorption may be adopted, and rice straw, wheat straw, quicklime, etc. may be used to spread water vapor or fog between the rows to achieve the purpose of dehumidification.

The second is the appropriate spray foliar fertilizer. The roots of continuous haze and rainy days can not normally absorb potassium, calcium, magnesium, iron, zinc and other metal elements, and the measures of top-dressing fertilizer supplement the nutrients that are lacking on the leaf surface. In addition to foliar dressings, plant growth regulators can also be applied, and plant growth regulators such as brassinolide should be sprayed every 10 to 20 days on cloudy and rainy days to promote photosynthesis and improve vegetative growth.

The third is to make reasonable light supplement measures. Supplemental lighting does not affect the temperature requirements of vegetables in the environment, during the day should be uncovered grasshopper (can not be uncovered grasshoppers for several days), to use cloudy scattered light, so that plants photosynthesis. The sudden sunny days after continuous cloudy days must not be uncovered completely. They should be opened at intervals. When the temperature rises, it should be properly ventilated at noon to reduce the temperature and release harmful gases inside the shed. Reduce waste of photosynthetic products by timely pruning and old leaves

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