施用氮素化肥是农业增产的一项有效措施,但由于施用方法不当,常使肥分损失严重,降低了氮肥的经济效果,提高了生产成本;甚至会使作物晚熟、青干或倒伏,导致减产。因而,合理使用氮肥,是一个重要问题。氮是植物蛋白质、叶绿素和其他有机化合物的重要成分,是作物生长发育不可缺少的元素,常见生长瘦弱、叶片发黄的作物, The application of N fertilizer is an effective measure to increase agricultural production. However, due to improper application method, it often causes serious loss of fertilizer, reduces the economic effect of N fertilizer and increases the production cost. It may even make the crops late, dry or fall, resulting in Cut Therefore, the rational use of nitrogen fertilizer is an important issue. Nitrogen is an important component of plant proteins, chlorophyll and other organic compounds and is an indispensable element of crop growth and development. Thin-walled plants often grow yellow, leaves turn yellow,