In the late autumn and early winter, rainy weather or sleet weather often occurs. If the minimum indoor temperature is higher than the minimum temperature required for vegetable growth, you can leave the grasshopper, and you must use an old shed film to cover the grasshoppers to prevent rain. Wetness increases greenhouse load and shortens greenhouse life. If the indoor temperature is lower than the minimum temperature required for vegetable physiology, we must cover the grasshopper and cover the grass with an old film to prevent rain and snow. If moderate to heavy snow occurs, remove it as soon as possible to prevent the snow from melting and soaking the grass.
Before the arrival of the storm, it is necessary to check the fixing of the plastic film. The lamination line or pressure bar must be firmly fixed and the grass bead must be tightly closed. Such weather may be expedited as soon as possible, but it must be emphasized that, in the case of continuous snow, the time for exposing each day cannot be less than 4 to 5 hours. Although this kind of weather does not have direct light, it can increase the temperature by scattering light. After a short period of time, the temperature drops, but generally it is 3 to 4° C. higher than that of uncovering after 30 minutes.
When it comes to snowfall, it is necessary to cover a layer of raccoon feathers and cover with a layer of rice straw. After the snow stops, remove the snow immediately to prevent melting of the snow and ensure that the mulch is dry to facilitate heat preservation. When the weather began to clear, slowly remove the cover to facilitate penetration into the sun. If the weather is clear after continuous snowfall, it should be lifted in time to prevent "flashing seedlings." After the exposing, we should pay attention to observe crop changes. When wilting occurs, we must immediately cover the grass weeds. After the recovery of the seedlings, remove the grass weeds. This repeated two or three days, and then transferred to normal management.
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