First, snow helps to keep the soil warm, and it can prevent freezing and keep the winter crops warm. Fresh snow is loose and porous and can contain 40%-50% air. Because air is not easy to transfer heat; Because of the cold weather in winter, snow is often not easy to melt; In this way, the earth is like a big and soft quilt. This kind of "quilt" can prevent the heat in the soil from radiating outward and prevent the invasion of cold air from the outside.
Second, snow is beneficial to increase soil moisture. After the cold, the weather gets warmer, the snow melts slowly, and the melted snow water loses less, and most of it penetrates into the soil, just like an irrigation, which is of great benefit to alleviating the spring drought and sowing well in spring.
3. Snow contains a lot of nitrides, which can improve soil fertility. Snow can adsorb a large number of free gases in the air and generate nitrides through chemical reactions. It is observed that if 1 liter of rain can contain 1.5 mg of nitride, then 1 liter of snow can contain 7.5 mg of nitride. When the snow melts, these nitrides are brought to the soil by snowmelt water and become the best fertilizer.
Fourth, snow can kill pests and reduce the occurrence of pests. Snow hinders the circulation of surface air, which will suffocate some pests who have wintered in the soil. Snow consumes a lot of heat when it melts, so the soil temperature suddenly drops. At this time, the pests and eggs on the surface of soil and the roots of crops can be frozen to death, which greatly reduces the pests when crops grow.
5. Snow can increase production. According to scientific experiments, snow water contains less heavy water, and the heavy water (tritium) per kilogram of snow water is 1/4 of ordinary water. Heavy water will inhibit the growth of crops, so soaking seeds with snow water, watering and spraying various crops and fruits on leaves can increase the yield.
6. Snow can improve quality. Irrigation of crops with snow water can improve the quality of crops. According to the investigation, Hami melon and seedless grape (dried) in Xinjiang are sweet and delicious because there is a lot of snow water irrigation. Cereals and fruits irrigated with snow water will also significantly improve their quality.
Refer to the above contents: China Weather Network-the scientific basis of auspicious snow year: the benefits of snowfall.