The relationship between snow and agricultural harvests, and what is the relationship between snow a

Snow has a detrimental and beneficial effect on the growth of crops.

Beneficial effect: Replenish soil water to ensure the normal growth of crops. The effect of heat insulation, such as winter wheat covered by snow, is conducive to maintaining soil temperature and making wheat safely overwinter.

Reduce the number of crop pathogens and pests in the farmland, and reduce the losses of crops in the following year due to the damage of pests and diseases. Adverse effects: If the temperature rises in March and April, and then suddenly cools down, and snowfall, the crop seedlings will not be able to withstand the invasion of low temperatures, and the phenomenon of wilting and digging will turn yellow.

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Analysis: In the north, a thick and loose layer of snow is like a quilt covering wheat from the cold. The nitrogen in the snow is easily absorbed and utilized by crops.

The low temperature of snow water can freeze the pests that overwinter on the surface, and it also brings benefits to agricultural production. Therefore, there is another agricultural proverb: "In winter, the wheat covers the three-layer quilt, and the next year sleeps with steamed buns." ”

Snow has a wide range of effects, but snow has great benefits for humans. First of all, it is conducive to the growth and development of crops. Because snow conducts heat very poorly, the soil surface is covered with a snow cover, which can reduce the transfer of soil heat and block the invasion of cold air on the snow surface, so the crops protected by snow can safely overwinter.

Snow also stores water for crops. In addition, snow enhances soil fertility. It has been determined that every 1 liter of snow water contains about grams of nitrogen.

When snow water penetrates the soil, nitrogen fertilizer is applied once. Feeding livestock and poultry with snow water and irrigating crops can yield significant benefits.

Snow erosion is an erosion effect caused by frequent thawing and frost heave in snow fields under glacial climates. Snow erosion occurs in polar and subpolar regions without ice sheets, as well as in alpine zones below the snow line and above the tree line. The average annual temperature there is around 0, which belongs to the permafrost zone.

The alternating freezing and thawing of the edge of the snow field breaks the surface material through ice splitting, on the one hand; On the one hand, snow melt water carries away the crushed fine-grained matter, so snow erosion includes two functions: denudation and transportation. As the bottom of the snow slope deepens and the perimeter expands, a wide shallow basin-like depression with a small slope around the slope gradually forms on the slope, that is, a snowmelt depression. Its morphology, genesis and spatial distribution are different from those of cirques, but they are related.

When the climate becomes colder and the snow line drops, the snow erosion depression can develop into an ice cirque. Conversely, when the climate warms and glaciers retreat, the cirque can degenerate into a snowmelt depression. The mode and rate of snow erosion under different physical geographical conditions vary. In places with low latitude, large precipitation and a large number of annual freeze-thaw days, the rate of snow erosion is relatively fast, and the snow erosion depression is deep and the area is large.

For example, in the Xiaoxing'an Mountains in northeast China, snow erosion depressions are very common. Conversely, snow erosion is weak in places with high latitudes, low precipitation, and low summer temperatures. The effects of ground slope are:

The slope is steep at 40°, and the snow field is not easy to exist; Snow erosion on flat ground is extremely slow; On the slope of about 30°, snow erosion is most active.

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Freeze dead bacteria. Pest.

In the spring, when the snow melts, crops can be irrigated.

Because snow freezes pests to death, the more pests will freeze to death if the snow falls, and the better the harvest will naturally be next year.

One is that it can kill many overwintering pests, and the other is that it replenishes the earth with a lot of water. That's why there is the saying of "Ruixue Trillion Year".

When the snow melts, it moistens the soil and freezes pests to death.

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Why is it good to have this snow?

1. Warm soil: snow is soft, similar to quilts, which can play a role in keeping warm, maintaining the temperature of the soil, and avoiding frostbite of crops. 2. Supplement nutrition

When the snow melts, trace elements such as phosphorus, sulfur and nitrogen combine with the elements in the soil to improve soil fertility. 3. Eliminate pests: The snow temperature is low, which can freeze pests to death.

1. Keep the soil warm

The snow covering the surface of the soil is softer, just like a quilt, which has the effect of keeping warm, can lock the heat in the soil inside, avoid frost damage to crops, and the snow is not easy to melt in winter, and the warmth effect is relatively good.

2. Supplement nutrition

Snow absorbs carbon dioxide, sulfur dioxide, hydrogen sulfide and other gases in the air, and when the temperature rises, the snow melts, transporting the mineral elements contained in it to the soil, thus synthesizing salts with the acids in the soil to provide nutrients for crops.

3. Eliminate pests

Snow is a substance produced at low temperatures, the temperature itself is low, and the pests in the farmland have poor cold tolerance, in the snowy weather, the pests will be covered with snow, frostbite and death, and when the snow melts in the spring of the following year, the number of pests will be greatly reduced, so that crops can grow better.