水稻 水稻对氮肥的吸收从返青后逐渐增加,分蘖期达到最高峰。为促使水稻早发棵、分蘖,应早施和重施分蘖肥。一般可在插秧后7～10天,667平方米追施硝酸铵15千克,抽穗时再追施尿素6.7千克。 小麦 小麦应在三叶期追肥,一般667平方米追施硝 The uptake of nitrogen by rice and rice increased gradually from turning green and reaching the peak at tillering stage. In order to promote early rice trees, tillers, should be early and re-applied tillering fertilizer. Generally 7 to 10 days after transplanting, 667 square meters topdressing 15 kg of ammonium nitrate, and then chasing urea 6.7 kg at heading. Wheat Wheat should be top-dressing in the three-leaf stage, generally 667 square meters topdressing nitrate