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Rape winter seedling preservation method
Rape seedlings in winter can be adapted to local conditions to adopt cultivator soil, cover grass protection, irrigation anti-freezing water, post-freeze management, reuse of wax fertilizer, spraying leaf fertilizer, pest control, control of convulsions and other measures. The cultivating soil breaks the soil compactness, improves the permeability and raises the temperature of the topsoil. Tillage before fertilization, rooting after fertilization to facilitate warming. When the average daily temperature drops to 0°C, the soil between the rows of rapeseed is soiled, the soil is covered with miscellaneous fertilizers, the seedlings are bacon, the seedlings are cultivated, and the seedlings are rooted. Covering the grass before the onset of frost damage, cover a layer of crop stalks on the rape or sprinkle a layer of grass ash to reduce the harm of cold winds. Irrigate the water before the freezing cold current arrives to stabilize the temperature and prevent it from freezing. The irrigation after freezing should be carried out at noon on a sunny day so that the topsoil covered by the frozen protrusions is solid, ensuring that the roots of the rape are in close contact with the soil. After the cold management, the seedlings were promptly checked for seedlings, and the seedlings were cultivated in the form of frozen seedlings. The rainwater and snow conditions eliminated the water accumulation in the field as soon as possible. After the thawing, the grass ash was sprayed or the leaves were sprayed with clear water to prevent water loss. Re-apply wax fertilizer to increase phosphorus and potash fertilizer, improve cold-resistant, disease-resistant and lodging-resistant ability of rapeseeds. Apply 1000-1500kg of pig manure or 2500-3000kg of soil miscellaneous fertilizer per acre before winter, increase soil temperature by 2°C~3. °C. Spraying foliar fertilizers such as potassium dihydrogen phosphate, vigor, and Huimanfeng before fertilizing can increase the cold-resistance capacity of rape. Boron-deficient rape should be sprayed with 0.2% borax solution. Prevention and control of pests and aphids, cabbage caterpillars, and beetles, 10 to 15 grams of imidacloprid per acre 10-15 grams of spray, or 40% omethoate 100 ml, 2.5% enemy killed 20 ml of water 150 kg spray. Buffering areas with heavier disease were treated with carbendazim or thiophanate spray. To control early rapeseed, rapeseed with 15% paclobutrazol powder (35-50 g per mu) and add 55-75 kg of water spray.