First, the nitrogen-control method is appropriate to reduce the amount of nitrogen fertilizer in the seedling stage, and it must not be applied to nitrogenous fertilizers to avoid poor cold resistance. Top dressing is early, in order to promote vegetable seedlings. Before the low temperature, can not apply nitrogen fertilizer, it is advisable to top phosphate and potassium fertilizer, in order to strengthen the cold resistance.
Second, the application of organic fertilizer method using pig manure or soil fertilizer and other warm farm manure, circle culture in 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, 1000-1500 kg per mu.
Third, the pouring of manure before pouring frost per acre poured 400-500 kg of manure water, so that the soil is not easy to freeze.
Fourth, soil cultivation before the joint cultivator, with crushed soil to rake up the roots, can make the soil fluffy, 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.
V. Coverage Law 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. 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 wind barriers of 1-1.5 meters high on the north side of the vegetable culm and used as a straw to prevent typhoons every 3-4 days.
Nine, winter irrigated before freezing time to the daily average temperature dropped to 3-5 °C is appropriate; after freezing in the cold after the irrigation, the maximum temperature rose to 2-3 °C, soil and vegetables 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 Ditches†to ensure that the gutters are dredged so that the frozen water can be eliminated in time.
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