The hazards of yin, fog, and cold weather are mainly caused by damage to the root system at low temperatures. Due to the continuous low temperature, the absorption function of the root system is greatly reduced. Once it is sunny, the transpiration of the plants is strengthened, and the roots can not keep up with the absorption of transpiration, often leaving a large number of dead seedlings after sunny days. After a long period of haze and sunshine, the management of greenhouse vegetables: 1) Pay attention to checking back and you can pull the curtain to prevent flashing seedlings. 2) Watering should be as slow as possible. Due to the continuous low temperature of the roots of cucumber is very weak, the root system must be rejuvenated and then watered. If you need to top-dressing with water, you should pour small water, apply fertilizer with water, the concentration should be low, and choose the quick-dissolving fertilizer is better, preferably humic acid fertilizer, is conducive to hair roots. 3) After sunny days, some root-promoting agents may be used to irrigate roots to promote rapid root recovery. 4) Foliar spray fertilizer, use multi-element fertilizer, make up for the lack of root absorption.
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