玉米後期防衰保產技術
合理施肥
shifeishiweilemanzuyumiduiyangfendexuqiu,bingbaozhenghouqibutuofei,shiqiyouzugoudelvyemianjijinxingguanghezuoyong。zaishizujifeihezhongfeidejichushang,gaochanyumitianyinggaizaicisuixiaosuifenhuayiqiande6~7片葉時施一次肥,即拔節孕穗肥,要重施。追施肥料以速效氮肥為主,每667平方米施尿素10公斤,鉀肥5公斤。抽雄前還需再施一次肥,即灌漿攻粒肥,宜輕施,每667平方米施5~7公斤氮素化肥。授粉後,在籽粒開始形成和灌漿過程中,還可葉麵噴肥1~2次,可噴施1%的尿素加0.3%的磷酸二氫鉀混合液。在早晨或傍晚噴施,噴布要均勻,葉片的正反麵都要噴到。
合理灌溉
yumizaiguanjiangqianheguanjiangshiyaoyouchongzudeshuifengonggei,shuifenbuzuyingxiangyumideguanghezuoyongjigenxideshengchangfayu,yingxiangguanjiangzhiliang。yinci,yumizaiguanjiangqiruguotianqiganhan,yaojishibushuiguangai,shiturangdechishuiliangbaochizai70%左右,以滿足玉米灌漿對水分的需求。如果玉米在灌漿期雨水偏多,要注意及時排水防澇。
防止倒伏
玉米後期倒伏,會造成玉米嚴重減產降質。防止倒伏要追肥、灌溉、中zhong耕geng培pei土tu有you效xiao結jie合he,以yi增zeng強qiang根gen係xi對dui養yang分fen的de吸xi收shou能neng力li,促cu進jin氣qi生sheng根gen的de生sheng長chang,增zeng強qiang植zhi株zhu的de抗kang倒dao伏fu能neng力li。中zhong耕geng培pei土tu要yao在zai拔ba節jie前qian進jin行xing,可ke將jiang田tian間jian的de土tu壤rang集ji中zhong培pei固gu在zai根gen莖jing周zhou圍wei,以yi利li於yu根gen係xi發fa育yu,增zeng強qiang植zhi株zhu的de抗kang倒dao伏fu能neng力li。另ling外wai,隔ge行xing去qu雄xiong,可ke以yi減jian少shao水shui分fen消xiao耗hao,降jiang低di株zhu高gao,改gai善shan通tong風feng透tou光guang條tiao件jian,防fang止zhi倒dao伏fu,減jian輕qing雄xiong穗sui蟲chong害hai,促cu進jin果guo穗sui發fa育yu,提ti高gao玉yu米mi的de產chan量liang和he品pin質zhi。



