First, the nitrogen-control method should be used to reduce the amount of nitrogen fertilizer in the seedling stage, and it must not be applied to nitrogenous fertilizers in order to avoid the poor cold resistance of the 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. Second, the application of organic fertilizer method using pig manure or soil fertilizer and other warm farm manure, circle cultivation in the root of the vegetable roots, can increase the root soil temperature 2-3 °C. Fertilization should be carried out on sunny days, 1,000-1500 kilograms per mu. Third, the pouring of manure before the frost per acre poured thin cast-water 400-500 kg, so that the soil is not easy to freeze. Fourth, soil cultivation combined with cultivators before the cultivator, with crushed soil cultivating the roots of soil, can make the soil loose, 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. V. Coverage Law In the afternoon before the onset of frost, use straw, rice straw, etc. to cover vegetables and vegetables, which can reduce wind and cold mechanical damage. Use 100 kg of straw per acre. Spread it sparsely and diligently. Do not cover all vegetables to prevent photosynthesis. Six, ash method First, in the cold before the onset of cryogenic damage on the vegetables sprinkle a thin layer of hull ash or plant ash; the second is to spread grass ash between the rows. Seven, smoked method uses weeds, straw, litter and other piled piles, or made of asphalt, ammonium nitrate, coal powder, sawdust, etc. made of frost-proof bombs, before the advent of frost on the corner of the top of the wind to ignite smoke Can disperse cold currents. 8. The wind barrier method is used to make 1-1.5-meter-high windbreaks on the north side of the vegetable culm, used as straw, and a windbreak is installed every 3-4 ft. Nine, winter irrigated before freezing time to the daily average temperature dropped to 2-5 °C is appropriate; after freezing in the cold water, the maximum temperature rose to 2-3 °C, soil and vegetable trees have been thawing. The winter irrigation should be poured with enough water to make it full of water. Tenth, before the advent of the freezing and chilling injury, open up the “three ditch†to ensure the openness of the ditch so that the frozen water can be eliminated promptly.
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