化肥施用是作物增产增效的关键技术之一,科学施用化肥可提高土壤中营养元素的含量,而且还可以改善农产品的品质和商品性,化肥在现代化农业生产中占有很重要的地位。据估算,我国氮磷钾肥对粮食增产的贡献率年平均为48.8%。一、合理施用氮磷钾氮肥:作物整个生育期都适宜氮肥的施用,但氮肥施多,使作物徒长、贪青晚熟,氮肥作底肥宜深施,化学性质稳定的如硫酸铵,硝 Fertilizer application is one of the key technologies of crop yield increase and efficiency. Scientific application of chemical fertilizers can increase the content of nutrients in soil, but also improve the quality and commerciality of agricultural products. Fertilizer plays a very important role in modern agricultural production. It is estimated that the annual average contribution rate of China’s NPK to grain yield is 48.8%. First, the rational application of nitrogen, phosphorus, potassium and nitrogen fertilizers: Crops throughout the growth period are suitable for the application of nitrogen fertilizers, but more nitrogen fertilizer, the crop is leggy, greedy late maturing, nitrogen fertilizer should be applied at the base, chemically stable, such as ammonium sulfate,