When growing vegetables in greenhouse, if it is rainy, one of the remedial measures should be to reduce the greenhouse temperature properly during the day and night to maintain crop yield.

Photosynthesis can only be carried out under light, so in a certain range, the intensity of photosynthesis increases with the increase of light intensity; The respiration of plants is influenced by temperature, oxygen and carbon dioxide concentrations, illumination and other factors. In a certain range, low temperature can inhibit the respiration of plants and reduce the consumption of organic matter in plants. Therefore, when vegetable farmers grow vegetables in greenhouses, proper illumination during the day can enhance photosynthesis, and proper cooling at night can weaken the respiration of plants and reduce the consumption of organic matter, thus increasing the accumulation of organic matter and increasing the yield of vegetables.

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