In winter and spring, vegetable snow damage is very common. In the event of heavy snowfall and continuous snowfall for many days, snow disasters will occur. The open vegetables will be buried or the shed will collapse, resulting in a major reduction in production or no harvest. Therefore, vegetable farmers should pay great attention to this. Studies have shown that when the snow cover is 20 cm thick, the snow weight per square meter can reach about 20 kilograms, and the snow on the roof of 1 acre can weigh more than 1,300 kilograms, which is enough to crush the shed film. During heavy snowfall and blizzard, any vegetables and sheds may be harmed.
Comprehensive and efficient prevention and control
1. Select cold-resistant vegetable varieties. For places with heavy snowstorms and high frequency of snowstorms, try to plant radishes, garlic, cabbage and other vegetable varieties with strong resistance to snow damage, and avoid planting melons and fruits.
2. Reinforce the shed before the arrival of winter. Reinforce and repair skeletons, doors, windows, and walls that do not meet the standards. When it is snowing, bamboo, wood, and iron (steel) rods can also be temporarily used for support and reinforcement to enhance the load-bearing capacity of the scaffold.
3. Clean up snow in time. When the snowfall is heavy, clean up the snow in vegetables, sheds and furrows at any time. Before it snows, remove the grass thatch, wrap it with old plastic film and put it indoors, and then hang it up (paved) after it snows.
Good shed management
1. Manage well before it snows. Cultivate the roots of vegetables once in winter or before snow, which can prevent snow and freeze damage; spray 0.2%～0.3% potassium dihydrogen phosphate solution on vegetable leaves 10～15 days before snowfall 1～2 times, every time Spraying 50-60 kg per mu each time can enhance the anti-freezing ability of vegetables; spraying 80-100 times of 27% high-fat film emulsion on vegetable leaves before snow and freezing damage occurs, spraying 50 kg per mu is good The antifreeze effect of the plant; before the snow and freezing damage occurs, spray the plant cold-resistant agent or the anti-stress-increasing agent once, use 150-300 ml of the medicine per mu, and add 50-60 kg of water, which can not only improve the cold and freezing resistance of vegetables, but also It can increase production and efficiency; applying organic manure is also conducive to improving the resistance to snow and freezing of vegetables. Partial application or only application of chemical fertilizers, especially nitrogen fertilizers, will significantly reduce the resistance to snow and freezing.
2. Manage well when it snows. During heavy snowfall, you can roll up most or all of the grass thatch in the daytime to enhance the indoor light; in case of continuous snowfall for multiple days, the indoor light of the shed is insufficient, you can install a few electric lights, etc., to fill up the light for 3 to 4 hours a day; If it is not a severe drought, do not water the vegetables. When watering is needed, use a small spoon or kettle to pour 15℃～20℃ warm water; when it is snowing, the temperature in the shed should be 4℃～5℃ lower than that in sunny weather. , Keep the temperature difference between day and night at about 10 ℃.
3. Manage well after it snows. Sprinkle hay, wood ash or chaff ash, etc. once during snow melting or thawing. Use 200-300 kilograms per acre. It has a certain effect of heat preservation, antifreeze and disease prevention; when melting snow, special attention should be paid to the occurrence of freezing and wet damage. Increase the heat preservation and warming work in the room. When planting open-field vegetables, go to the field to patrol and clear the ditch in time. After the snow or snow disaster, the damaged facilities should be repaired in time, and the waste membranes, brackets, and yellow, dead and rotten leaves should be removed. (Fruit, plant) and so on.
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