1.danfeishiyongguoduo
，huizaochengturangdansuguoliang。guoliangdedansuhuiyugengduodetanshuihuahewuxingchengdanbaizhi，shengxiadetanshuihuahewuyongzuogouchengxibaobideyuanliao，huizhishizuowuxibaobibianbo，zuzhirouruo，yinqizhizhutuchang

，jingmancu，yepiandaerbo，cuiqieyizhe。

    2.作zuo物wu吸xi收shou過guo多duo的de氮dan素su，葉ye片pian過guo於yu肥fei大da，株zhu間jian鬱yu閉bi，通tong風feng透tou光guang能neng力li下xia降jiang
，降jiang低di了le作zuo物wu群qun體ti的de光guang能neng利li用yong率lv，作zuo物wu呼hu吸xi旺wang盛sheng，會hui增zeng加jia光guang合he產chan物wu的de消xiao耗hao
，減jian少shao幹gan物wu質zhi積ji累lei
，造zao成cheng減jian產chan。

    3.施用氮肥過多，植株抗逆能力下降，易感病蟲害和遭受凍害，特別易感染病毒。

    4.過量施用氮肥，會抑製磷

、jiaheweiliangyuansudexishou
，daozhiguoshichengshuman
，yansebuzheng

，chuxianjixingguo，zhishihuayafenhualvjiangdi，yingyangshengchangguosheng，zuoguolvdihuobuzuoguo
，guaguopengdasuduman，huagua。

    5.pengshishucaishiyongdanfeiguoduo，turangshuirongdanhanlianggao
，yizhuanhuachenganqihuoxiaosuanqiti，yuanyuanbuduandicongturangzhongshifangdaokongqizhong
，zaochenganqihuoxiaosuanqitizhongdu，xunhuaishucaiyepian。

    6.過量施用氮肥，還會加劇土壤次生鹽漬化，使蔬菜果實中的鈣、鎂等營養元素顯著減少，經常出現缺鈣、缺鎂症狀。

    總之

，施用氮肥一定要適時、shiliang，zuodaoyuqitayingyangyuansupeihe。zaishucaishengchangdebutongjieduan，yaojingchangkaizhanturangdansuguochengjiankong，tuiguangcetupeifangshifei，rangcainongchedibaituofeihaibuduan
，shifeizengchanbuzengshouhuozheshifeibuzengchanbuzengshou，shenzhiguoliangshifeijuechanjueshoudejiongpokunjing。