The impact of snowfall on greenhouse vegetable production is manifold: First, mechanical damage. Due to the gravity effect of snow, the snow is too thick and it can often compress the unstructured greenhouse. The second is insufficient light. There is no sunshine in the snow itself. In addition, in order to keep the greenhouse warm, a number of layers of grass cover and other coverings are added outside the shed to make the light in the shed seriously insufficient and photosynthesis cannot be carried out. The third is freezing injury. Snowfall is often accompanied by low temperatures, and improper management can easily cause damage to greenhouse vegetables.
Improve the structure of the greenhouse can be used conditionally can adopt the shed of steel and concrete skeleton structure. At the same time, the roof should have a certain slope, making it difficult for snow.
When the snow falls during the daytime, it is necessary to cover the snow mane and cover it with grasshoppers. After the snow stops, the snow will be cleared immediately. At night, the snow will be removed, and the snow will be promptly removed 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.
Strengthen the management of coverings. Remove the coverings in time to see the seedlings in the snow. Continuous cloudy snow weather suddenly turns fine. After peeling off the cover, observe the changes of the seedlings and find the wilt. Immediately cover it with a bristle and recover. Then open it again and cover it with wilfulness, and so on. After 2-3 days, it can be transferred to normal management; if it is unveiled, it will easily lead to “falling seedlingsâ€.
Pay attention to ventilation and ventilation If you encounter more than 3 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 1-2 hours .
With skillful use of snow water, chemical damage is beneficial to innovation and melting of snow water, the content of nitride is 4 times higher than that of rain with the same volume, the content of heavy water is 1/4 less than normal water, and the content of toxic and harmful substances such as phenol and mercury is also higher than that of ordinary water. less. 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.
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