Nitrogen control method
Appropriate to reduce the amount of nitrogen fertilizer 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. Before the low temperature, can not apply nitrogen fertilizer, phosphorus and potassium fertilizer should be topdressing 1 times, in order to enhance the cold resistance.
The application of organic manure with pig manure or soil fertilizer and other warm farm manure, circle cultivation in the rootstock of the crop, fertilization should be sunny and sunny, per acre Shi 1000 ~ 1500 kg.
Casting manure before the frost poured thin cast manure 400 to 500 kg, so that the soil is not easy to freeze.
Soil cultivators combined with cultivators before soil freezing and cultivating the roots with crushed soil can loosen the soil and increase the soil temperature, and can directly protect the roots. However, the cultivating soil should be carried out before the soil is frozen. The depth should be 7-10 cm.
Coverage method In the afternoon before the onset of frost, use straw, rice straw, etc. to cover the vegetables and vegetables. Use 100 kg of straw per acre. Disperse it sparsely and cover all the vegetables to prevent affecting photosynthesis.
The ash method sprinkles a thin layer of hull ash or ash on the vegetables before the cold freezing damage occurs; grass ash is scattered between the rows.
Smoke smoke stacks with weeds, straw, and litter. Before the frost arrives, the smoke is ignited at the corners of the top wind, which can dispel cold currents.
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