根據各種氮肥特性加以區別對待。碳酸氫銨和氨水易揮發損失
，宜作基肥深施；硝態氮肥在土壤中移動性強

、肥效快
，是旱田的良好追肥

；一般水田作追肥可用銨態氮肥或尿素。有些肥料對種子有毒害，如尿素
、碳酸氫銨

、氨水
、石灰氮等，不宜做種肥；liusuanandengjinguankezuozhongfei，danyongliangbuyiguoduo，bingqiefeiliaoyuzhongzijianzuihaoyouturanggeli。zaiyuliangpianshaodeganhandiqu，xiaotaidanfeidelinshiwentibutuchu，yinciyishiyongxiaotaidanfeijiaoheshi，zaiduoyudiquhuojiangyujijie，yishiyongantaidanfeiheniaosujiaohao。

要將氮肥深施。氮肥深施可以減少肥料的直接揮發、隨水流失、硝化脫氮等方麵的損失。深層施肥還有利於根係發育，使根係深紮，擴大營養麵積。

合理配施其他肥料。氮肥與有機肥配合施用對奪取作物高產、wenchanjijiangdichengbenjuyouzhongyaozuoyong，zheyangzuobujinkeyimanzuzuowuduiyangfendequanmianxuyao
，erqiehaikeyipeifeidili。danfeiyulinfeipeiheshiyong，ketigaodanlinliangzhongyangfendeliyongxiaoguo
，youqizaiturangfeilijiaodideturangshang，danlinfeipeiheshiyongxiaoguogenghao。zaiyouxiaojiahanliangbuzudeturangshang，danfeiyujiafeipeiheshiyong
，yenengtigaodanfeidexiaoguo。