一、要準確把握第一次肥水管理時間
fanqingqiyaojiaoxiaomaibaomiaoshui,bingzhuyijiaohouchuhua,yilitiwenbaoshang。fanqingqijiaoshuihou,youyuqiwendi,diwenhuishenghuihenman,shiduda,maitianbinghaihuijiazhong,xiaomaishengchangyexiangduijiaoman。yinzheshixiaomaizishenshengchanghaoshuijiaoshao,yinerjiaoshuiduixiaomaishengchangbuli。fanqingfeinengyouxiaocujinxiaomaishengchang,zengjiachunjifennie、促進成穗。因此,返青水適用於旱情嚴重的麥田,返青肥適用於群體不足麥田。
群qun體ti不bu足zu麥mai田tian要yao澆jiao起qi身shen水shui,施shi起qi身shen肥fei。起qi身shen期qi肥fei水shui不bu增zeng加jia分fen蘖nie總zong量liang,但dan可ke提ti高gao成cheng穗sui率lv,從cong而er增zeng加jia畝mu穗sui數shu,因yin而er起qi身shen期qi肥fei水shui適shi用yong於yu群qun體ti不bu足zu的de麥mai田tian、旱情嚴重的麥田、冬前過旺春季轉弱的麥田。對於群體適中或偏大的墒情適宜麥田,起身水肥管理會造成群體過大、基部節間太長、中部葉片過大、易倒伏等不利影響,因而不宜采用,同時已澆過返青水的麥田也不宜采用。
zhutimaitianyaozaibajieqijinxingchunjidiyicishuifeiguanli。bajieqifeishuiguanlinengjiakuaimaitiandaxiaonieliangjifenhua,cujinxiaohuafenhua,shiqiyekuandajianzhuang,tigaokangzaoshuainengli,youliyupeiyuhelidequnti、健jian壯zhuang的de個ge體ti,對dui形xing成cheng合he理li的de畝mu穗sui數shu和he穗sui粒li數shu意yi義yi重zhong大da。同tong時shi第di一yi次ci肥fei水shui管guan理li在zai拔ba節jie期qi進jin行xing也ye是shi減jian少shao春chun季ji澆jiao水shui次ci數shu,推tui廣guang小xiao麥mai節jie水shui高gao產chan技ji術shu的de關guan鍵jian,要yao想xiang又you少shao澆jiao水shui又you高gao產chan,那na麼me隻zhi有you省sheng去qu拔ba節jie以yi前qian對dui小xiao麥mai產chan量liang影ying響xiang不bu大da的de澆jiao水shui。
二、科學確定小麥春季追肥用量
一般麥田春季追肥用量,尿素在15~25公斤,碳胺可用到50~75公斤,分次追肥的應以起身拔節期追肥為主。具體用量要做到“四結合”:一yi是shi結jie合he底di肥fei施shi用yong情qing況kuang。如ru果guo底di肥fei的de用yong量liang按an我wo們men在zai小xiao麥mai播bo種zhong時shi建jian議yi的de那na樣yang,做zuo到dao了le氮dan磷lin鉀jia比bi例li合he理li,總zong量liang充chong足zu,那na你ni可ke以yi適shi當dang多duo施shi春chun季ji追zhui肥fei爭zheng取qu高gao產chan。如ru果guo小xiao麥mai的de底di肥fei施shi用yong量liang不bu足zu或huo搭da配pei不bu合he理li,尤you其qi是shi磷lin鉀jia肥fei施shi用yong不bu足zu,那na你ni就jiu沒mei有you必bi要yao追zhui太tai多duo的de氮dan肥fei,以yi免mian造zao成cheng浪lang費fei和he引yin起qi貪tan青qing晚wan熟shu。二er是shi結jie合he苗miao情qing。冬dong前qian旺wang苗miao,由you於yu冬dong前qian消xiao耗hao養yang分fen較jiao多duo,可ke在zai春chun季ji多duo追zhui一yi些xie氮dan肥fei。三san是shi結jie合he土tu壤rang保bao水shui保bao肥fei能neng力li。沙sha薄bo漏lou地di保bao水shui保bao肥fei能neng力li差cha,需xu澆jiao水shui次ci數shu多duo,為wei提ti高gao肥fei料liao利li用yong率lv,需xu分fen次ci追zhui肥fei,可ke適shi當dang增zeng加jia總zong追zhui肥fei量liang。四si是shi結jie合he管guan理li的de需xu要yao。如ru果guo返fan青qing期qi需xu要yao施shi肥fei,那na麼me小xiao麥mai春chun季ji至zhi少shao需xu要yao追zhui兩liang次ci肥fei,這zhe樣yang,也ye需xu要yao適shi當dang加jia大da春chun季ji追zhui肥fei總zong量liang。
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