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. 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 Â°C. Fertilization should be carried out on a sunny day, 1000-1500 kg per mu. 3. Casting manure: 400-500 kg of thin manure poured per acre before frost, so that the soil is not easy to freeze. 4, soil method: combined with cultivator before freezing, with crushed soil cultivating soil roots, can increase soil temperature, but also can 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, cover method: Before the advent of frost, with straw, straw, etc. covered in vegetables and vegetables. Use 100 kg of straw per acre. Disperse it sparsely and cover all vegetables to prevent 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 smoke method: Use weeds, straw, litter, etc. to be placed in piles, or use asphalt, ammonium nitrate, coal powder, sawdust, etc. to make frost-proof bombs. Before the frost comes, ignite and smoke at the corners of the upper wind. Smoke, 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 the average daily temperature of 2-5Â°C; the irrigation after freezing should be performed when the soil and vegetable trees have been 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.
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