小xiao麥mai抽chou穗sui以yi後hou,即ji進jin入ru生sheng長chang後hou期qi階jie段duan,這zhe個ge時shi期qi是shi決jue定ding穗sui粒li數shu和he千qian粒li重zhong的de關guan鍵jian時shi期qi,也ye是shi田tian間jian管guan理li的de重zhong要yao時shi期qi。省sheng農nong業ye技ji術shu推tui廣guang總zong站zhan專zhuan家jia指zhi出chu,搞gao好hao這zhe一yi階jie段duan的de管guan理li,對dui於yu減jian少shao小xiao花hua退tui化hua,提ti高gao結jie實shi率lv,增zeng加jia穗sui粒li數shu,延yan緩huan衰shuai老lao,提ti高gao千qian粒li重zhong具ju有you非fei常chang重zhong要yao的de意yi義yi。當前應重點搞好以下管理技術措施:
一、澆足澆好揚花灌漿水
小麥開花至成熟期的耗水量占整個生育期耗水總量的四分之一,需要通過澆水滿足供應。幹旱不僅會影響粒重,抽穗、開花期幹旱還會影響穗粒數。所以,小麥揚花後10~15天tian左zuo右you應ying及ji時shi澆jiao灌guan漿jiang水shui,以yi保bao證zheng小xiao麥mai生sheng理li用yong水shui,同tong時shi還hai可ke改gai善shan田tian間jian小xiao氣qi候hou,降jiang低di高gao溫wen對dui小xiao麥mai灌guan漿jiang的de不bu利li影ying響xiang,減jian少shao幹gan熱re風feng的de危wei害hai,提ti高gao籽zi粒li飽bao滿man度du,增zeng加jia粒li重zhong。此ci期qi澆jiao水shui應ying特te別bie注zhu意yi天tian氣qi變bian化hua,嚴yan禁jin在zai風feng雨yu天tian氣qi澆jiao水shui,以yi防fang倒dao伏fu。成cheng熟shu前qian土tu壤rang水shui分fen過guo多duo會hui影ying響xiang根gen係xi活huo力li,降jiang低di粒li重zhong,所suo以yi,小xiao麥mai成cheng熟shu前qian10天要停止澆麥黃水。
二、全麵推行“一噴三防”技術,防病防蟲防早衰
小麥生長後期是多種病蟲害發生的主要時期,主要有麥蚜、麥紅蜘蛛、麥葉蜂、鏽病、白粉病、葉枯病、chimeibingdeng。yaozuohaoyuceyubao,jizaojinxingfangzhi。zaifangzhishiyaochongfenfahuizhibaozhuanyejifangduidezuoyong,shixingtongfangtongzhi。weilejianhuacaozuo,jinxingbingchongfangzhishihoukeheyemianpenfeijieheqilai,jishajunji、殺蟲劑與葉麵肥結合施用,可起到同時防病、防蟲、防幹熱風等“一噴三防”效果。目前常用的葉麵肥主要有0.2%~0.3%的磷酸二氫鉀溶液、0.2%的天達2116植物細胞膜穩態劑溶液和1%~3%的尿素溶液。葉麵追肥最好在晴天下午4點以後進行,間隔7~10天再噴一次,連噴2~3次。噴後24小時內如遇到降雨應補噴一次。
防治麥蜘蛛,可用0.9%阿維菌素乳油3000倍液噴霧防治;防治小麥吸漿蟲,要在小麥抽穗至揚花初期的成蟲發生盛期,畝用50%高效氯氰菊酯乳油20~30毫升對水噴霧,兼治一代棉鈴蟲;防治麥蚜,可用10%吡蟲啉乳油每畝10~15克噴霧,兼治灰飛虱;防治紋枯病,可用5%井岡黴素水劑每畝150~200毫升兌水75~100公斤噴麥莖基部,間隔10~15天再噴一次;防治白粉病、鏽病,可用20%粉鏽寧乳油每畝50~75毫升噴霧;防治赤黴病、葉枯病和穎枯病,可用50%多菌靈可濕性粉劑每畝75~100克噴霧。以上病蟲混合發生可采用對路藥劑一次混合施藥防治。
三、及時清除麥田雜草,防止進一步蔓延
對dui前qian期qi化hua學xue除chu草cao不bu徹che底di的de地di塊kuai,尤you其qi是shi野ye燕yan麥mai較jiao多duo的de地di塊kuai。應ying及ji時shi徹che底di拔ba除chu,拔ba除chu的de麥mai田tian雜za草cao要yao帶dai到dao田tian外wai深shen埋mai或huo幹gan後hou燒shao掉diao,防fang止zhi下xia年nian進jin一yi步bu蔓man延yan危wei害hai。
四、搞好選留種工作,適時收獲
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