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1.控氮法苗期适当减少氮肥用量,切不可偏施氮肥,以免植株抗寒力差。追肥要早,以促使菜苗老健。低温之前不能施用速效氮肥,宜追施一次磷钾肥,以增强抗寒力。2.施肥法用猪牛粪或土杂肥等暖性农家肥,围培在菜棵根茎处,可提高根部土温2~3℃。施用宜趁晴天进行,每亩1000~1500公斤。3.浇粪法在冰冻前每亩泼浇稀粪水400~500公斤,使土壤不宜结冻。
1. Nitrogen method seedling appropriate to reduce the amount of nitrogen, must not partial nitrogen fertilizer, so as to avoid poor cold hardiness. Top dressing to be early, in order to promote vegetable seedling health. Can not be used before low-temperature nitrogen fertilizer, phosphorus should be topdressing a potash, in order to enhance the cold hardiness. Fertilization method with pig manure or Tuza Fei and other warm manure, permaculture in the roots of vegetables, can increase the root soil temperature 2 ~ 3 ℃. Application should take advantage of sunny days, per acre 1000 to 1500 kg. 3. pouring manure method before pouring pouring dilute water per mu of frozen 400 ~ 500 kg, so that the soil should not be frozen.