The scientific basis for auspicious snow heralding a good harvest is based on the following six points:

1. Snow helps to keep the soil warm and has the effect of preventing freezing and keeping warm overwintering crops. The newly fallen snow on the ground is loose and porous and can contain 40%-50% of air. Because the air is not easy to conduct heat; and because the weather is cold in winter, the snow that falls often does not melt easily; in this way, the earth is like being covered with a big, soft quilt. This "quilt" can prevent the heat in the soil from radiating outward and prevent the intrusion of cold air from the outside.

2. Snow accumulation is conducive to increasing soil moisture. After the cold, the weather warms up and the snow slowly melts. The melted snow water is less lost and most of it seeps into the soil, just like irrigation, which is of great benefit to alleviating spring drought and doing spring plowing and sowing.

3. Snow contains a lot of nitrogen compounds that can improve soil fertility. Snow can absorb a large amount of free gases in the air and generate nitrogen compounds through chemical reactions. According to observations, if 1 liter of rainwater can contain 1.5 mg of nitrogen compounds, then 1 liter of snow can contain 7.5 mg of nitrogen compounds. When snow melts, these nitrogen compounds are carried into the soil by the snow melt water and become the best fertilizer.

4. Snow can eliminate pests and reduce the occurrence of pests. Snow blocks the circulation of surface air and can suffocate some pests that overwinter in the soil. When snow melts, a large amount of heat is consumed, causing the soil temperature to drop suddenly. At this time, pests and eggs on the soil surface and in the roots of crops can be frozen to death, greatly reducing pest damage when crops are growing.

5. Snow can increase production. According to scientific experiments, snow water contains less heavy water, and the heavy water (tritium) content per kilogram of snow water is 1/4 of ordinary water. Heavy water has the effect of inhibiting crop growth, so soaking seeds with snow water, watering, and foliar spraying of various crops and fruits have the effect of increasing yields.

6. Snow can improve quality. Irrigating crops with snow water can improve the quality of the crops. Someone has conducted a survey and found that the reason why Xinjiang's cantaloupe and seedless grapes (dried) are sweet and delicious is that they are irrigated by a large amount of snow water. The quality of grain and fruits irrigated with snow water will also be significantly improved.

Reference for the above content: China Weather Network - The scientific basis for auspicious snow to herald a good harvest: the benefits of snowfall