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大白菜在莲座期叶和根都迅速生长,为使粮深扎,此时应西地制宜地进行蹲苗,一直到外部叶颜色深绿,心叶由黄变绿,中午稍有蒌蔫,下午三点后能恢复原状为止。蹲苗后追一次肥,每亩追硫铵15公斤,也可追些磷酸二铵和钾肥,然后浇一次大水。过1—2天松土一次,天气干旱时可每隔5—6天浇一水。结球期是白菜生长最旺盛的时期,需积累大量养分,因此要加强肥水管理。结合浇水亩追大粪稀500—1000公斤,或硫铵10—15公斤,硫酸钾7.5—10公斤,对保水保肥力差的土壤,要少量勤迫,一般追3—4次即可,同时要保持土壤湿润,每隔4—5天浇一次水,收获前5—10天停止浇水。
Chinese cabbage in rosette leaves and roots are rapidly growing, in order to make the grain deep bar, at this time should be appropriate to the West to squat seedlings, until the outer leaves dark green color, the heart leaves from yellow to green, noon a little 蒌 蔫, After three o’clock in the afternoon to restore the status quo. After chasing Miao chase a fertilizer, ammonium sulfate 15 kilograms per acre, but also chase some diammonium phosphate and potash, and then pour a flood. After 1-2 days of loosening soil once every 5-6 days when the weather is dry pouring water. Cotyledon is the most vigorous growth of cabbage period, need to accumulate a large number of nutrients, so to strengthen fertilizer and water management. In combination with the watering, Mu chase leftover 500-1000 kilograms, or ammonium sulfate 10-15 kilograms, 7.5-10 kilograms of potassium sulfate, water and fertilizer poor soil, to a small amount of hard work, you can generally chase 3-4 times, at the same time To keep the soil moist, pour water once every 4-5 days and stop watering 5-10 days before harvest.