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Winter vegetables cold insulation ten methods
1, nitrogen control method: appropriate reduction in the amount of nitrogen fertilizer at the seedling stage, must not be partial nitrogen fertilizer, so as to avoid the cold resistance of plants. Top dressing is early, in order to promote vegetable seedlings. Before the low temperature, you can't apply the available nitrogen fertilizer, and you should top-up a phosphorus and potassium fertilizer to enhance the cold resistance. 2, the application of organic fertilizer method: the use of pig cattle manure or soil fertilizer and other warm farm fertilizer, circle cultivation at the root of the root of the vegetable tree, can increase the root soil temperature 2-3 °C. Fertilization should be carried out on sunny days, 1,000-1500 kilograms per mu. 3. Pouring method: pouring 400-500 kilograms of thin manure per acre before frost, so that the soil is not easy to freeze. 4, soil method: the combination of cultivators before freezing, with crushed soil to cultivate the roots of soil, can make the soil loose, increase soil temperature, but also directly protect the roots. However, the cultivating soil must be carried out before the soil is frozen. The depth should be 7-10 cm. 5. Coverage method: In the afternoon before the onset of frost, straw, rice straw, etc. are used to cover vegetables and vegetables, which can reduce wind and cold mechanical damage. Use 100 kg of straw per acre. Disperse it sparsely and cover all vegetables to prevent affecting photosynthesis. 6, ash method: First, in the cold before the onset of cryogenic damage on vegetables in a thin layer of husk ash or plant ash; the second is to spread grass ash between the rows. 7. Smoke-curing method: stacking piles with weeds, straw, litter, etc., or making frost-proof bullets with asphalt, ammonium nitrate, coal powder, sawdust, etc., and ignite and smoke at the corners of the top of the wind before the frost arrives. Smoke can dispel cold currents. 8, Wind Barrier Law: In the north side of the vegetable pot used as straw and other 1-1.5 meters high wind barriers, every 3-4 sets a wind barrier. 9. Winter irrigation method: The irrigation time before freezing should be reduced to the daily average temperature of 2-5°C. After freezing, the maximum temperature rises to 2-3°C after the cold water is poured, and the soil and vegetable trees are thawed. The winter irrigation should be poured with enough water to make it full of water. 10. Drainage method: Open "Three Ditches" to ensure the smoothness of the ditch so that the frozen water can be eliminated in time. Contributed by Jilin Province Agricultural Technology Extension Station (Plant Protection)