在玉米生长期间,根据土壤养分与植株营养诊断,本着缺什么补什么的精神,进行施肥和浇水等管理工作。一、追肥:据试验,每生产100斤玉米籽粒,需氮2.49斤,磷0.75斤,钾2.3斤。亩产700斤以上的土壤速效养分应当是:速效氮50PPM、速效磷20ppm、速效钾100 During corn growing, according to soil nutrition and plant nutrition diagnosis, in the spirit of lack of what to make up for fertilization and watering and other management work. First, the top dressing: According to the test, each producing 100 kg of corn seeds, nitrogen 2.49 kg, 0.75 kg of phosphorus, potassium 2.3 kg. Soil available nutrients per mu yield of more than 700 pounds should be: available nitrogen 50PPM, available phosphorus 20ppm, available potassium 100