First, snow hazard

1. Mechanical damage. Due to the gravity of snow, the snow is too thick and it can often collapse the unstructured greenhouse. According to calculations, when the thickness of snow is about 20 cm, the amount of snow per square meter can reach 20 kg, and the weight of snow on the canopy of each mu of greenhouse can reach 13 tons or more. Such a heavy burden is difficult to support in a simple greenhouse such as a bamboo structure, and it is easily damaged.

2. Insufficient light. There is no sunshine in the snow, and in addition to the insulation of the sheds, a number of layers of grass rakes and other coverings are placed on the outside of the shed to make the shed less serious and the photosynthesis cannot be carried out.

3. Freezing damage. As the saying goes: "The snow is not cold and snow is cold." Snowfall is often accompanied by low temperatures. Improper management can easily cause damage to greenhouse vegetables.

Second, response measures

1. Improve the structure of the greenhouse. Conditions can be used sheds with steel and concrete skeleton structure. If bamboo and plastic pipe frames are used, their load capacity should be carefully tested and arched designs should be used to enhance support capabilities. At the same time, the roof should have a certain slope, making it difficult for snow.

2. Timely snow removal. During the daytime snowfall, it is necessary to cover the mane grasshoppers, cover the grasshoppers, remove the snow immediately after the snow stops, take snowfall at night, and sweep the snow after the snow stops to keep the cover dry. When the snow is particularly large, whether it is during the day or at night, it must be followed by a sweep to prevent the snow from overcrowding.

3. Strengthen the management of the cover. After the snow, the cover was peeled off in time for the seedlings to see the light, and the continuous cloudy snow weather suddenly turned fine. After peeling off the cover, we must observe the changes of the seedlings, find the wilt, immediately cover it with a bristle mantle, and then recover and uncover it. Then cover, so repeated, after 2 to 3 days, can be transferred to normal management; if it is unveiled, it is easy to cause "down seedlings."

4. Pay attention to ventilation and ventilation. If you encounter more than 3 consecutive days of cloudy snow weather, because the vegetable's respiratory depletion is greater than photosynthesis, shed indoor will accumulate a lot of harmful gases such as carbon dioxide, to use the high temperature at noon to put the top wind for 1 to 2 hours.

5. Skillfully use snow water, harm the benefits. The content of nitrides in melting snow water is 4 times higher than that of rainwater of the same volume, the heavy water content is 1/4 less than ordinary water, and the content of toxic and harmful substances such as phenol and mercury is also lower than ordinary water. Heavy water is a kind of radioactive material and it has a strong inhibitory effect on various life processes. Therefore, it is called "dead water." Using snow water instead of ordinary water soaking, watering vegetables, can greatly reduce the harm of heavy water and increase vegetable production. According to experiments, the germination rate of cucumber seeds soaked with snow is 40% higher than normal; watering cucumber seedlings with snow can increase production by 1 time.

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