目前正值冬小麥出苗、分蘖、長根的重要時期,也是培育冬前壯苗、goujianshiyiquntideguanjianshiqi。riqian,nongyebuxiaomaizhuanjiazhidaozujiujinqijiangwenyuxuetianqiduixiaomaideyingxiangjinxinglefenxi,bingtichujiaqiangdongqianxiaomaitianjianguanliyingzhuahaowuxiangcuoshi。
zhuanjiazhichu,jinqidiwenyuxuetianqihuanjielehanqing,buchongleturangshuifen,zengjialeturangshangqing,youliyuxiaomaianquanyuedong。danjiangxuejiangwenshijianbichangnianmingxiantizao,shejifanweida,weiliniantongqishaojian,duidongxiaomaizhengchangshengchangzaochengyidingyingxiang。yishimaimiaoshengchangshouzu。hanchaojiangwenhechixudiwenyanhuanlexiaomaiyepianchusheng、分蘖發生和根係生長進程,個別苗弱、秸稈還田整地差、turangkongxidajibufenqianqiqueshangmaitianchuxianqingdudonghai,yejianqingkubingzhujianfahuang。jishiweishoudonghaidexiaomai,shengchangsuduyeshoudaohendayingxiang,ruguochixudiwen,jiangzaochengdongqianfenniebuzu。ershibufenruomiaozaoshoudonghai。youyujiangwenshijianbichangnianpianzao,xiaomaishangchuyuyoumiaoqi,yepianjiaonen,kanghannenglicha,yixieruomiaoyuqianghanchaotianqiyizaoshoudonghai。tongshi,yepianshoudongjianxiaoleguanghezuoyongmianji,jiashangguangzhaobuzu,yingxiangshengchanghefenniejieyingyangwuzhijilei,duikanghanyuedongbuli。sanshiyingxiangwanbomaixingchengzhuangmiao。bufenwanboxiaomaichumiaohuanman、出苗不齊,群體不足,影響產量。
針對近期降溫和雨雪天氣帶來的不利影響,專家提出,應抓住未來十多天氣溫回升及冬前有限的時機,立足早管、細管,以促蘖長根、塑造群體、防止凍害、培育壯苗為重點,切實加強冬前小麥田間管理。
1. 查苗補種,疏密補稀 在適宜地區,對斷壟15厘米以上的地方及時補種經浸種催芽的同品種種子或疏密補稀。補苗後踏實澆水,確保麥苗成活。
2. 中耕鎮壓,控旺促壯 冬(dong)前(qian)對(dui)麥(mai)田(tian)中(zhong)耕(geng)劃(hua)鋤(chu),尤(you)其(qi)是(shi)在(zai)每(mei)次(ci)降(jiang)雨(yu)或(huo)澆(jiao)水(shui)後(hou)適(shi)時(shi)中(zhong)耕(geng)保(bao)墒(shang),破(po)除(chu)板(ban)結(jie),彌(mi)實(shi)裂(lie)縫(feng),滅(mie)除(chu)雜(za)草(cao),減(jian)少(shao)水(shui)分(fen)蒸(zheng)發(fa),促(cu)根(gen)蘖(nie)健(jian)壯(zhuang)生(sheng)長(chang),增(zeng)強(qiang)麥(mai)苗(miao)抗(kang)旱(han)抗(kang)凍(dong)能(neng)力(li)。對(dui)群(qun)體(ti)過(guo)大(da)、過旺的麥田,可采取深中耕斷根、鎮壓、噴施植物生長抑製劑等措施控旺轉壯,預防冬季強降溫後麥苗發生凍害,保苗安全越冬。
3. 因苗製宜,運籌肥水 對底肥施用不足,有缺肥症狀的麥田,或受凍較重、葉片嚴重枯黃的麥田,在冬前分蘖期每畝施尿素5~7公斤,底肥沒施磷肥的要氮磷肥配合施用。對底肥充足、群體適宜、生長正常和土壤墒情適宜的麥田,冬前一般不施肥澆水。對黃淮冬麥區和北部冬麥區本次雨雪較少、缺墒的麥田仍應澆冬水。對秸稈還田、旋耕播種、土壤懸空不實的麥田必須冬灌。對地力差、底肥不足、群體較小、長勢差的弱苗麥田,可在立冬至小雪期間澆冬水,結合澆水施尿素5~7公斤,促進生長。對一般壯苗麥田,可在日平均氣溫降至5℃左右時(11月底至12月初)澆jiao好hao越yue冬dong水shui,澆jiao水shui後hou及ji時shi中zhong耕geng鬆song土tu,保bao墒shang增zeng溫wen。對dui無wu澆jiao水shui條tiao件jian的de丘qiu陵ling旱han地di麥mai田tian,如ru果guo底di肥fei不bu足zu,應ying趁chen冬dong前qian雨yu雪xue天tian後hou施shi用yong速su效xiao化hua肥fei,同tong時shi用yong糞fen、草覆蓋,保苗安全越冬。
4. 化學除草,防治病蟲 11月中下旬小麥分蘖期重點搞好麥田化學除草工作,同時加強對地下害蟲的查治。
5. 清溝理墒,排水降漬 長(chang)江(jiang)中(zhong)下(xia)遊(you)麥(mai)區(qu)開(kai)好(hao)麥(mai)田(tian)一(yi)套(tao)溝(gou),排(pai)水(shui)降(jiang)漬(zi),防(fang)止(zhi)濕(shi)害(hai),並(bing)適(shi)當(dang)加(jia)大(da)開(kai)溝(gou)密(mi)度(du),注(zhu)意(yi)將(jiang)溝(gou)土(tu)均(jun)勻(yun)拋(pao)撒(sa)蓋(gai)苗(miao)。發(fa)現(xian)小(xiao)麥(mai)葉(ye)片(pian)嚴(yan)重(zhong)受(shou)凍(dong),影(ying)響(xiang)分(fen)蘖(nie)生(sheng)長(chang),可(ke)適(shi)當(dang)施(shi)氮(dan)磷(lin)肥(fei),促(cu)進(jin)小(xiao)分(fen)蘖(nie)生(sheng)長(chang),增(zeng)加(jia)群(qun)體(ti)。
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