After snowing, snow covers farmland, just like putting a thick cotton-padded jacket on crops, which can prevent cold air from freezing crops.

Snow can freeze pests to death.

When snow melts, it will take away the heat of the soil, which will suddenly lower the temperature of the soil, thus freezing some pests to death. It's already cold in winter, and crops have a certain cold resistance. After the snow melts, the weather will get warmer, which will not have much impact on crops, but it will freeze some pests to death, which is beneficial to the growth of crops.

These effects of snow must be accomplished in cold days. If the weather gets warmer in March and April, heavy snow will not only do no good to crops, but will do great harm.

Step 3 add fertilizer

Snow contains a certain amount of nitride, and 1 liter of rain water can contain 1.5 mg of nitride, so 1 liter of snow can contain 7.5 mg of nitride.