產chan量liang增zeng加jia，需xu鉀jia量liang提ti高gao。隨sui著zhe玉yu米mi產chan量liang水shui平ping的de提ti高gao，在zai關guan鍵jian生sheng育yu期qi要yao求qiu土tu壤rang有you效xiao鉀jia的de供gong應ying相xiang應ying增zeng加jia。許xu多duo玉yu米mi長chang期qi定ding位wei試shi驗yan的de結jie果guo證zheng明ming，當dang產chan量liang增zeng加jia10%～20%時，吸鉀量也出現了相應增加。適當提高玉米組織的含鉀量才能保持穩定的高產。北方春播玉米區盡管土壤速效鉀含量處於較高水平（如 70～130毫克/公斤）
，施用鉀肥仍有增產效果。特別是一些速效鉀含量中等、緩huan效xiao鉀jia的de容rong量liang也ye不bu大da的de土tu壤rang，就jiu要yao考kao慮lv高gao產chan田tian增zeng施shi鉀jia肥fei。因yin此ci在zai以yi產chan量liang目mu標biao作zuo為wei推tui薦jian施shi鉀jia的de主zhu要yao依yi據ju時shi，既ji要yao注zhu意yi對dui有you效xiao鉀jia含han量liang較jiao低di的de土tu壤rang增zeng施shi鉀jia肥fei是shi保bao證zheng高gao產chan的de必bi要yao措cuo施shi，還hai要yao注zhu意yi一yi些xie土tu壤rang有you效xiao鉀jia水shui平ping即ji使shi中zhong等deng時shi，增zeng施shi適shi量liang鉀jia肥fei也ye有you良liang好hao的de效xiao果guo。

zhongzhimiduzengjia，xujialiangtigao。dangqianzajiaoyumigaochanzaipeizhongchangchangtongguozengjiamiduershichanliangdedaodafudutigao
，yucitongshigaomiduzhizhuduinongtiandexijialiangyemingxiantigao。suoyizaimiduzengjiashi，rubuxiangyingzengshijiafeihuotigaoturangjiadeyouxiaoxing，zezuowuyinxijiananyibaozheng
，chanliangkenengxiajianghuodabudaolixiangshuiping。danshizengshijiafei5～6公斤/muhou
，chanliangbujiangfaneryousuotigao。youqizaiyouxiaojiahanliangbugaobingyouguangaitiaojiandeyumidikuai。suoyizaiduiyumituijianshifeishi，weileshiyingjiaogaodemiduhechanliangshuiping，shijialiangyaobichangguiliangshidangtigao。

氮dan鉀jia平ping衡heng，需xu鉀jia量liang提ti高gao。密mi植zhi高gao產chan玉yu米mi栽zai培pei中zhong

，協xie調tiao鉀jia肥fei和he氮dan肥fei的de平ping衡heng供gong應ying很hen關guan鍵jian。通tong常chang情qing況kuang下xia，為wei了le實shi現xian高gao產chan目mu標biao而er偏pian多duo施shi氮dan

，由you此ci加jia重zhong了le植zhi株zhu病bing蟲chong害hai如ru莖jing腐fu、根腐、青枯病等的感染率。如果不相應增加鉀肥供應，會形成氮鉀失調的症狀。缺鉀首先減弱了玉米莖
、yedekangzheqiangduhebiaopihoudu，jijiazhongledaofudekenengxing

，youtigaoleyumiduichonghaihebinghaideminganxing。zhongsuozhouzhi，zaiyingyangyuansuzhongdanhejiaduiyumikangbingxingdeyingxiangdouda，danerzhedezuoyongfangxiangbutong
，danpianduowangwanghuizengjiayumiduibinghaideminganxing，erjiadezuoyongzexiangfan，keyizengjiazuowudekangbingxing。

那麼，怎樣診斷田間缺鉀呢？缺鉀應怎樣補鉀呢？

當(dang)春(chun)玉(yu)米(mi)進(jin)入(ru)拔(ba)節(jie)階(jie)段(duan)，從(cong)小(xiao)喇(la)叭(ba)口(kou)到(dao)大(da)喇(la)叭(ba)口(kou)的(de)生(sheng)育(yu)時(shi)期(qi)是(shi)它(ta)快(kuai)速(su)生(sheng)長(chang)時(shi)期(qi)，對(dui)氮(dan)磷(lin)鉀(jia)要(yao)素(su)的(de)需(xu)求(qiu)都(dou)有(you)所(suo)增(zeng)長(chang)。通(tong)常(chang)在(zai)實(shi)際(ji)生(sheng)產(chan)中(zhong)習(xi)慣(guan)於(yu)隻(zhi)追(zhui)施(shi)氮(dan)肥(fei)而(er)不(bu)注(zhu)意(yi)追(zhui)施(shi)鉀(jia)肥(fei)，但(dan)是(shi)在(zai)春(chun)玉(yu)米(mi)高(gao)產(chan)密(mi)植(zhi)栽(zai)培(pei)中(zhong)，到(dao)底(di)需(xu)不(bu)需(xu)要(yao)追(zhui)肥(fei)
，隻(zhi)要(yao)問(wen)一(yi)問(wen)田(tian)間(jian)生(sheng)長(chang)的(de)玉(yu)米(mi)，觀(guan)察(cha)植(zhi)株(zhu)生(sheng)長(chang)狀(zhuang)況(kuang)，就(jiu)可(ke)能(neng)得(de)到(dao)回(hui)答(da)。那(na)就(jiu)是(shi)經(jing)常(chang)在(zai)上(shang)午(wu)九(jiu)十(shi)點(dian)的(de)時(shi)候(hou)跑(pao)到(dao)玉(yu)米(mi)地(di)看(kan)，尤(you)其(qi)刮(gua)風(feng)的(de)天(tian)氣(qi)更(geng)要(yao)看(kan)，如(ru)果(guo)看(kan)到(dao)春(chun)玉(yu)米(mi)的(de)葉(ye)片(pian)在(zai)上(shang)午(wu)就(jiu)打(da)蔫(nian)了(le)，那(na)它(ta)就(jiu)是(shi)告(gao)訴(su)你(ni)“我缺鉀了”。yinweiduiyuyibanbujixuguangaidenongtian，zhengchangjianzhuangdeyumizhizhu，shangwubuhuichuxianyepiandanianxianxiangde
，daozhongwuhouchuxiandanianxianxiangcaishizhengchangde。yinweijiakeyiyingxiangyepianqikongdeguanbihezengjiazhizhubaoshuigongneng。quejiashiqikongzulida，bunengzhengchangguanbi

，daozhiyumitineishuifensunshiyanzhongerchuxiandanianxianxiang。zheshibixuzhuishijiafeijiayibujiu。zuikexingdecuoshijiushizhuishilvhuajia5～8公斤
，溝施或穴施後
，複土即可。