zaochunjijie,qihouyijiubuhenzhengchang,youqishihulenghuredetianqijiyidaozhimaimiaozaoshoudonghai,name,zaizheyijijie,ruheyufangmaimiaofashengdonghaiheduifashengdonghaidemaimiaojinxingbujiune?筆者現將一些實踐經驗整理如下:
對生長過旺麥田適度抑製生長 主要措施是早春鎮壓、起qi身shen期qi噴pen施shi壯zhuang豐feng安an。早zao春chun鎮zhen壓ya旺wang苗miao,抑yi製zhi小xiao麥mai過guo快kuai生sheng長chang發fa育yu,避bi免mian其qi過guo早zao拔ba節jie而er降jiang低di抗kang寒han性xing,是shi預yu防fang春chun季ji凍dong害hai的de簡jian而er易yi行xing的de方fang法fa。另ling外wai,在zai起qi身shen期qi噴pen施shi壯zhuang豐feng安an,一yi是shi可ke以yi適shi當dang抑yi製zhi生sheng長chang發fa育yu,提ti高gao抗kang寒han性xing,二er是shi可ke以yi抑yi製zhi第di一yi節jie間jian過guo度du伸shen長chang,提ti高gao抗kang倒dao性xing。
灌水防早春凍害 由(you)於(yu)水(shui)的(de)熱(re)容(rong)量(liang)比(bi)空(kong)氣(qi)和(he)土(tu)壤(rang)熱(re)容(rong)量(liang)大(da),因(yin)此(ci)早(zao)春(chun)寒(han)流(liu)到(dao)來(lai)之(zhi)前(qian)澆(jiao)水(shui)能(neng)使(shi)近(jin)地(di)層(ceng)空(kong)氣(qi)中(zhong)水(shui)汽(qi)增(zeng)多(duo),在(zai)發(fa)生(sheng)凝(ning)結(jie)時(shi),放(fang)出(chu)潛(qian)熱(re),以(yi)減(jian)小(xiao)地(di)麵(mian)溫(wen)度(du)的(de)變(bian)幅(fu)。同(tong)時(shi),灌(guan)水(shui)後(hou)土(tu)壤(rang)水(shui)分(fen)增(zeng)加(jia),土(tu)壤(rang)導(dao)熱(re)能(neng)力(li)增(zeng)強(qiang),使(shi)土(tu)壤(rang)溫(wen)度(du)增(zeng)高(gao)。有(you)澆(jiao)灌(guan)條(tiao)件(jian)的(de)地(di)區(qu),在(zai)寒(han)潮(chao)來(lai)前(qian)噴(pen)水(shui),可(ke)以(yi)調(tiao)節(jie)近(jin)地(di)麵(mian)層(ceng)小(xiao)氣(qi)候(hou),對(dui)防(fang)禦(yu)早(zao)春(chun)凍(dong)害(hai)有(you)很(hen)好(hao)的(de)效(xiao)果(guo)。但(dan)是(shi)返(fan)青(qing)水(shui)不(bu)要(yao)澆(jiao)得(de)太(tai)早(zao),要(yao)等(deng)地(di)下(xia)5厘米處地溫升高到5℃以上時,再開始澆水,澆水不要太大,以當天能夠滲完為宜。
增施有機肥,中耕培土 在春季小麥起身拔節生長前,增施一些牲畜糞等有機肥和磷肥、jiafei,kecujingenxifayu,yizhimaimiaodishangbufenwangchang,zengqiangkanghannengli。jishizhonggengpeitukeyufangmaitianturangbanjie,baoshangfanghan,tigaodiwen,jianqinghuofangzhimaimiaoshoudongsiwang。
若發生早春凍害可采取如下補救措施。
追速效肥 受到早春凍害的小麥應立即施速效氮肥,並澆水,從而促進小麥早分蘖、小蘖趕大蘖、提高分蘖成穗率、減輕凍害的損失,提高農民種田效益。凍害嚴重的麥田,返青後要適時早追速效化肥,一般每畝可增加5~10萬分蘖,每畝可增加穗數2~5萬以上。
中耕澆水 多中耕可提高地溫,促進潛伏芽早發快長。除此之外還應適時澆水,一般在氣溫回升,小麥開始起身時結合追肥澆水為宜。
移栽補苗 小xiao麥mai受shou凍dong後hou,麥mai苗miao分fen蘖nie節jie呈cheng棕zong褐he色se者zhe為wei死si苗miao,地di上shang部bu分fen幹gan枯ku,但dan分fen蘖nie節jie呈cheng白bai色se或huo綠lv色se,說shuo明ming沒mei有you喪sang失shi生sheng機ji。對dui死si苗miao造zao成cheng的de缺que苗miao斷duan壟long,可ke采cai取qu移yi栽zai的de辦ban法fa進jin行xing補bu救jiu,移yi栽zai應ying在zai地di剛gang化hua凍dong後hou進jin行xing。
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