1, combined with soil cultivator soil before cultivation, with crushed soil rake soil roots, can increase the 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.
2, the application of organic fertilizer method using pig manure or soil fertilizer and other warm farm manure, circle cultivation in the root of the root of the vegetable, can increase the root soil temperature 2-3 °C. Fertilization should be carried out on a sunny day, 1000-1500 kg per mu.
3, the nitrogen control method to reduce the amount of nitrogen fertilizer in the seedling period, must not be partial nitrogen fertilizer, so as to avoid poor cold resistance. Top dressing is early, in order to promote vegetable seedlings.
4. Casting manure Before the frost, 400-500 kilograms of thin manure poured per acre will make the soil less likely to freeze.
5. Coverage Before the frost comes, use straw, rice straw, etc. to cover vegetables and vegetables. Use 100 kg of straw per acre. Disperse it sparsely and cover all vegetables to prevent photosynthesis.
6. The first method is to sprinkle a thin layer of hull ash or ash on the vegetables before the cold freezing injury occurs; the second is to spray the wood ash between the rows.
7. The method of fumigation is to use piles of weeds, straw, litter, etc., or be made of asphalt, ammonium nitrate, coal powder, sawdust, etc., and fire smoke before the frost begins. To disperse cold currents.
8. The windbreak method is used to make 1-1.5m high windbreaks on the north side of the vegetable culm and used as a straw to prevent typhoons every 3-4 ft.
9, Drainage method to open a good "three ditch" to ensure that the gutters open, in order to promptly eliminate frozen water.
10. The irrigation time before winter irrigation is preferably 2-5°C, and the irrigation 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.
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