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<BR>　　玉米倒伏是指玉米莖稈節(jié)間折斷或傾斜。玉米倒伏的方式有3種：莖倒、根倒及莖折。莖倒是莖稈長(zhǎng)得細(xì)長(zhǎng)，植株過高，基部組織強(qiáng)度差，遇暴風(fēng)雨造成莖稈傾斜；根倒是根系發(fā)育不良，灌水及雨水過多，遇風(fēng)引起傾斜度較大的倒伏；莖折主要是抽雄前生長(zhǎng)較快，莖稈組織嫩弱及病蟲危害，遇風(fēng)引起的莖稈折斷。其中，對(duì)產(chǎn)量影響最大的是莖折，其次是根倒，莖倒對(duì)產(chǎn)量的影響最輕。 <BR>　　 <BR>　<STRONG>　1玉米倒伏的原因 <BR></STRONG>　　 <BR>　　1.1種植密度不合理 <BR>　　在玉米播種和玉米間定苗時(shí)，不能做到因地制宜、因品種制宜地保留適宜的種植密度，造成密度過大，群體內(nèi)光照弱，光合產(chǎn)物少，導(dǎo)致莖稈纖細(xì)，其硬度和韌性降低，穗位升高，遇暴風(fēng)雨時(shí)發(fā)生倒伏。 <BR>　　1.2較大的風(fēng)雨 <BR>　　在玉米生長(zhǎng)季節(jié)里，造成玉米倒伏的大風(fēng)雨一般有2種情況：第一種情況是大風(fēng)之前下透雨造成玉米倒伏；第二種情況是大風(fēng)和大雨同時(shí)進(jìn)行造成玉米倒伏；而在大風(fēng)之后才下大雨，一般不造成玉米倒伏。 <BR>　　1.3施肥方法不當(dāng) <BR>　　第一種情況是施底肥時(shí)不施鉀肥或鉀肥用量過少，氮肥用量明顯過多，造成玉米營(yíng)養(yǎng)失衡，玉米生長(zhǎng)過快，植株過高，莖稈細(xì)長(zhǎng)，并且基部機(jī)械組織強(qiáng)度差，遇暴風(fēng)雨時(shí)玉米發(fā)生倒伏。第二種情況是在玉米生長(zhǎng)期間追施肥料時(shí)，肥料離根莖基部過近，將根的基部燒斷，使支持根（氣生根）的數(shù)量減少，導(dǎo)致根的支持作用降低而發(fā)生倒伏。第三種情況是追肥時(shí)施入地表過淺，造成玉米根下扎滯緩，使玉米根系不發(fā)達(dá)而發(fā)生倒伏。 <BR>　　1.4品種不當(dāng) <BR>　　有的品種本身抗倒性差，當(dāng)把其作為主栽品種時(shí)，就容易發(fā)生倒伏；品種不抗病蟲害或抗病蟲害能力差，使其抗倒能力減弱，也易發(fā)生倒伏。 <BR>　　1.5田間管理措施不當(dāng) <BR>　　在玉米播種時(shí)不增施磷鉀肥，不采取寬窄行種植，沒有采取生根粉拌種等措施；在玉米生長(zhǎng)期間，不能合理地施肥澆水，使玉米不能茁壯地生長(zhǎng)；發(fā)生病蟲害時(shí)不能及時(shí)防治，使玉米抵抗能力降低；不噴施玉米“壯豐靈”，這都能導(dǎo)致玉米發(fā)生倒伏。 <BR>　　 <BR>　<STRONG>　2防止玉米倒伏的有效措施 <BR></STRONG>　　 <BR>　　2.1選用抗倒品種 <BR>　　目前生產(chǎn)上抗倒性較好的品種有農(nóng)大108、安玉8號(hào)、鄭單14、濮單3號(hào)、鄭單17、鄭單958等。 <BR>　　2.2合理密植 <BR>　　合理密植要因地制宜、因品種制宜，一般應(yīng)按品種說明書上的密度種植，不可隨意增加或減少種植密度，只有這樣才能為玉米生長(zhǎng)創(chuàng)造良好的通風(fēng)條件，避免因通風(fēng)不良而造成玉米倒伏。 <BR>　　2.3播前曬種、拌種，及時(shí)防治病蟲害 <BR>　　玉米播種前，曬種2～3d，并使用劑</a>和生根粉拌種，以增強(qiáng)玉米的抗病能力和發(fā)根能力，從而提高玉米的抗倒能力。在玉米生長(zhǎng)期間發(fā)生病蟲害時(shí)，應(yīng)及時(shí)防治病蟲害，也能有效地防止玉米倒伏。 <BR>　　2.4加強(qiáng)肥水 <BR>　　施底肥時(shí)因地制宜地適當(dāng)增加磷鉀肥的施用量，同時(shí)增施農(nóng)家肥；追肥時(shí)要深施，并距植株根莖基部7cm，避免燒根和根系發(fā)育不良；在玉米苗期底墑充足的情況下，控制灌水，進(jìn)行蹲苗，蹲苗時(shí)應(yīng)掌握“蹲黑不蹲黃，蹲肥不蹲瘦，蹲干不蹲濕”的原則，時(shí)間應(yīng)從出苗開始到拔節(jié)前結(jié)束，套種玉米苗勢(shì)較弱，一般不進(jìn)行蹲苗。雨水過多的地區(qū)，應(yīng)注意排<a target="_blank" title="澇">澇</a>通氣。 <BR>　　2.5噴施玉米“壯豐靈”（矮壯素） <BR>　　在玉米生長(zhǎng)的心葉末期（抽雄前7d左右），用玉米“壯豐靈”噴灑植株頂部，可抑制植株頂部生長(zhǎng)，降低株高15cm左右，從而降低風(fēng)的作用力，達(dá)到抗倒的目的。 <BR>　　 <BR>　　<STRONG>3倒伏后的補(bǔ)救措施</STRONG> <BR>　　 <BR>　　玉米倒伏可采用多種措施加以防止，即使這樣如果遇到難以控制的大風(fēng)大雨，也會(huì)引起倒伏，為了減輕損失，可采取一些補(bǔ)救措施。如果是抽雄前后倒伏，一定要在倒伏后及時(shí)扶起，并邊扶邊施肥培土；如果是在拔節(jié)前后倒伏，不必人工扶起，可讓其自動(dòng)恢復(fù)直立。 <BR>　　 <BR>　　參考文獻(xiàn) <BR>　　 <BR>　　[1] 王紅軍，顧大路，楊文飛.玉米倒伏的原因、防止方法及補(bǔ)救措施[J].現(xiàn)代科技，2006（10）：36-37. <BR>　　[2] 程小丹，李紅梅.玉米倒伏后的急救措施[J].新農(nóng)業(yè)，2006（9）：21. <BR>　　[3] 金亮.玉米防倒伏措施[J].現(xiàn)代農(nóng)業(yè)科技，2006（7）：26.</P><script>s("content_relate");</script><p>【淺談?dòng)衩椎狗脑蚣胺乐勾胧肯嚓P(guān)文章：</p><p><a target="_blank" href="http://m.1-jiu.com/biyelunwen/fanwen/qita/391431.html" title="淺談?dòng)衩捉Y(jié)實(shí)性差的原因及預(yù)防措施">淺談?dòng)衩捉Y(jié)實(shí)性差的原因及預(yù)防措施</a><span>10-09</span></p><p><a target="_blank" href="http://m.1-jiu.com/biyelunwen/fanwen/tongxingongcheng/421228.html" 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