Pre-snow management
1. When there is a cloudy day before snow, it is necessary to uncover the grasshoppers and fight for precious scattered light.
2. The application of organic fertilizer before snow can increase the heat capacity of the soil, buffer the cooling brought about by the loss of heat even in cloudy days, and can also promote the ability of the root system to improve cold resistance.
3. Moderate control of water before snow is very important to reduce the relative humidity of indoor air, and it can also create an environment where the bottom is damp and the topsoil is dry.
Snow management
1, when the snow should be on a good grass rake, timely cover the greenhouse with cold film, in the front edge of the greenhouse with grass rake and then block a layer of cold skirts, the buffer room close tightly closed to prevent the cold wind to enter.
2. Photosynthesis of vegetable crops is very weak when snow is snowfall, and there are few photosynthetic products synthesized. In order to reduce respiratory consumption, night greenhouse temperature should be 2°C to 3°C lower than nighttime in sunny days.
3. In the case of continuous cloudy snow days, the respiratory depletion of vegetables is greater than photosynthesis, and a large amount of harmful gases such as carbon dioxide are accumulated in the greenhouse. Therefore, for more than three days in continuous snowfall, the snow at noon should be released for one hour.
Post-snow management
1, after the snow to remove the film on the snow cover, increase the transparency and the amount of light; as long as the temperature does not cause a sharp decline after the exposing of the shed temperature, it should be revealed every day.
2, when the sun comes out, if the leaves appear wilting, should put down a part of grasshopper shading, can be placed one by one, until the wilting recovery, and then roll drafting crickets, such as wilting reappear, you can put grass rake down, so repeated several Times, the general wilting can be restored.
3. If disease has occurred in the greenhouse, conventional spraying will not only increase the humidity in the greenhouse, but also increase the severity of the disease. It can be prevented by the use of smoke aerosols such as chlorothalonil and sulfasalazine.
4, in order to prevent vegetables from freezing, should promptly loosen the soil, the appropriate amount of topdressing quick-acting fertilizer can be used 0.2% potassium dihydrogen phosphate solution foliar spray to promote vegetable growth.
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