The purpose of shading facilities is to weaken the light, lower the temperature or shorten the light time in the summer high temperature season, so as to meet the requirements of some vegetables for the temperature and light conditions, and create high-yield and high-quality conditions.
Shading facilities have a strong effect of reducing light and temperature, so they are mainly used for vegetable cultivation and seedling raising in summer and autumn high temperature seasons. Leafy vegetables cultivated in summer in greenhouses need to grow and develop under shading equipment. The newly-built sunshade net shed is mainly used for seedling cultivation or cultivation of celery, Chinese cabbage, cabbage, tomato, cucumber and other vegetables. Compared with open field sowing, the emergence rate can be increased by about 30%, and it can reduce the occurrence of viral diseases and other diseases. The cultivation of celery with sun-shade nets also has the effect of increasing yield and improving quality. In application, attention should be paid to prevent excessive growth due to insufficient light, and the shading facilities should be withdrawn in time and gradually according to the sunshine conditions.
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