今年的冬天毫無疑問是幹旱的暖冬。當前暖冬天氣對農作物的生長影響表現在以下幾方麵:一、暖冬造成病蟲害增加,對明年的防蟲不利。二、暖冬天氣使得小麥萌動或恢複生長,抗寒能力下降,易遭受凍害;同tong時shi也ye使shi麥mai田tian表biao土tu反fan複fu凍dong融rong,土tu質zhi疏shu鬆song,水shui分fen散san失shi增zeng多duo,加jia之zhi降jiang水shui偏pian少shao,土tu壤rang墒shang情qing逐zhu漸jian下xia降jiang,使shi小xiao麥mai越yue冬dong後hou期qi及ji返fan青qing生sheng長chang均jun存cun有you隱yin患huan。由you於yu土tu壤rang缺que乏fa墒shang情qing,如ru果guo後hou期qi再zai沒mei有you降jiang水shui或huo者zhe灌guan溉gai跟gen不bu上shang會hui引yin起qi作zuo物wu幹gan旱han減jian產chan。三san、duichanliangyingxiangyaokanchunjideqihouerding,ruguochunjimeiyoudadeelietianqiyingxiang,duichanliangyingxiangbushihenda,qianjinianjiuyounuandongtianqirengranfengshouchuxian。yinggaijishigenjujinhoudetianqibianhuacaiqucuoshi。
針對以上幾點小麥春管要加強,要因地製宜分類管理,注意以下幾方麵:
一、及(ji)時(shi)防(fang)治(zhi)病(bing)蟲(chong)害(hai)。要(yao)密(mi)切(qie)關(guan)注(zhu)各(ge)類(lei)病(bing)蟲(chong)的(de)發(fa)生(sheng)趨(qu)勢(shi),早(zao)發(fa)現(xian),早(zao)防(fang)治(zhi),力(li)爭(zheng)把(ba)病(bing)蟲(chong)害(hai)消(xiao)滅(mie)在(zai)初(chu)始(shi)階(jie)段(duan)。春(chun)季(ji)紅(hong)蜘(zhi)蛛(zhu)和(he)紋(wen)枯(ku)病(bing)的(de)防(fang)治(zhi)工(gong)作(zuo)最(zui)為(wei)重(zhong)要(yao)。
二、yinmiaozhiyi,pubianzhonggeng。zaochunyaozhonggeng,danyingyindizhiyi,fenleiguanli。duiyuchangshijiaochahuochangshiyibandemaitian,yingshiduqianzhonggeng,pochubanjie,tiwenbaoshang,cujingenxifayu,shimaimiaozhuanzhuang;對(dui)於(yu)有(you)旺(wang)長(chang)趨(qu)勢(shi)的(de)麥(mai)田(tian),要(yao)適(shi)當(dang)深(shen)中(zhong)耕(geng),斷(duan)其(qi)部(bu)分(fen)根(gen)係(xi),抑(yi)製(zhi)其(qi)過(guo)快(kuai)生(sheng)長(chang),控(kong)旺(wang)轉(zhuan)壯(zhuang),以(yi)防(fang)禦(yu)凍(dong)害(hai)。謹(jin)慎(shen)中(zhong)耕(geng)鎮(zhen)壓(ya),一(yi)定(ding)要(yao)在(zai)中(zhong)午(wu)或(huo)下(xia)午(wu)兩(liang)三(san)點(dian)以(yi)後(hou)麥(mai)苗(miao)已(yi)化(hua)凍(dong)時(shi)進(jin)行(xing),以(yi)防(fang)止(zhi)傷(shang)苗(miao)。
三、根據墒情分類管理。及時查看墒情,根據土壤和天氣變化情況采取相應措施。采取耬耙、鎮壓等措施,減少水分消耗,提溫保墒,促進小麥返青生長。早春應及時中耕劃鋤,尤其是對晚播和失墒嚴重的麥田,以促進早分蘖、早轉化。對缺墒嚴重的麥田要及時澆補墒水。
四、預(yu)防(fang)凍(dong)害(hai)。根(gen)據(ju)往(wang)年(nian)經(jing)驗(yan),暖(nuan)冬(dong)常(chang)有(you)倒(dao)春(chun)寒(han)。因(yin)此(ci),要(yao)密(mi)切(qie)關(guan)注(zhu)天(tian)氣(qi)變(bian)化(hua)。在(zai)寒(han)流(liu)來(lai)臨(lin)之(zhi)前(qian),采(cai)取(qu)澆(jiao)水(shui)或(huo)噴(pen)灑(sa)激(ji)素(su)等(deng)措(cuo)施(shi)預(yu)防(fang)凍(dong)害(hai)。一(yi)旦(dan)造(zao)成(cheng)凍(dong)害(hai),要(yao)視(shi)凍(dong)害(hai)程(cheng)度(du)及(ji)時(shi)采(cai)取(qu)中(zhong)耕(geng)、施肥、澆水、噴灑激素等措施補救,將凍害損失降低到最低程度。
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