Before the snowfall, we should use a good grass rake, cover the shed in time with a cold-proof film, use a grass rake in the front of the shed to block a layer of cold-proof skirts, and close the buffer door tightly to prevent cold wind from entering. Photosynthesis of vegetable crops is very weak when snowing, and there are few photosynthetic products synthesized. In order to reduce respiratory consumption, the temperature of night greenhouses should be 2 to 3°C lower than the nighttime of sunny days. In the case of continuous snowfall, the respiratory consumption of vegetables is greater than photosynthesis, and large amounts of harmful gases such as carbon dioxide are accumulated in greenhouses. Therefore, for more than 3 days in continuous snowfall, snow should be released for 1 hour at noon.
After the snow, the snow on the shed film should be removed in time to increase the transparency and the amount of light; as long as the temperature does not cause a sharp decline in the temperature of the shed after the exposing, it should be seen every day. When the sun comes out, if the leaves appear wilting, some grasshoppers should be put down and shading. They can be placed one at a time. After the wilting is restored, they are drafted again. If wilting reappears, the hoe can be put down again. The general wilting can be restored. If diseases have occurred in the greenhouse, conventional spraying will not only increase the humidity in the greenhouse, but also increase the severity of the disease. It can be prevented by the use of aerosols such as chlorothalonil and sulfasalazine. In order to prevent the vegetables from freezing, they should loosen the soil in time and apply the available fertilizer in an appropriate amount, which can be sprayed with 0.2% potassium dihydrogen phosphate solution to promote vegetable growth.
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