dongxiaomaimiaoqihefanqingqifashengdedonghaiduichanliangyingxiangjida。zhelianggeshiqidedonghaijinnianlaizaixinjidengdidexiaomaishengchanzhongshichangfasheng，geinongminzaochengjiaodajingjisunshi。小麥發生凍害的主要原因有以下幾點：

    1.氣候原因。全球氣候變暖，小麥播種後至越冬前氣溫比過去偏高，導致部分小麥生長過快
，抗寒性減弱，造成小麥凍害。

    2.整地質量差。近幾年小麥整地播種方式一般是采用犁地、旋耕、播bo種zhong或huo者zhe直zhi接jie用yong旋xuan耕geng機ji旋xuan耕geng兩liang遍bian，就jiu直zhi接jie播bo種zhong。這zhe種zhong整zheng地di方fang式shi造zao成cheng土tu壤rang過guo於yu疏shu鬆song，土tu壤rang中zhong水shui分fen散san失shi嚴yan重zhong，土tu壤rang熱re容rong量liang小xiao，進jin入ru冬dong季ji後hou，造zao成cheng小xiao麥mai地di上shang部bu葉ye片pian及ji根gen部bu凍dong害hai，這zhe是shi造zao成cheng小xiao麥mai大da麵mian積ji凍dong害hai的de主zhu要yao原yuan因yin。

    3.播(bo)期(qi)不(bu)當(dang)。近(jin)幾(ji)年(nian)農(nong)村(cun)勞(lao)動(dong)力(li)大(da)量(liang)外(wai)出(chu)務(wu)工(gong)，秋(qiu)作(zuo)物(wu)收(shou)獲(huo)後(hou)農(nong)民(min)不(bu)分(fen)小(xiao)麥(mai)品(pin)種(zhong)的(de)特(te)性(xing)
，搶(qiang)時(shi)播(bo)種(zhong)，把(ba)部(bu)分(fen)需(xu)要(yao)晚(wan)播(bo)品(pin)種(zhong)提(ti)前(qian)播(bo)種(zhong)，造(zao)成(cheng)小(xiao)麥(mai)年(nian)前(qian)出(chu)現(xian)瘋(feng)長(chang)、旺長現象
，抗寒性降低
，造成大麵積凍害。

    4.danfeishiyongliangguoda。danfeishixiaomaishengchangbibukeshaodefeiliao，danshiyongguoduoqieyicixingzuojifeishiruyiyinqiyoumiaowangchang，yepianxinen
，fenniejiewufachuzangzugoudetangfen，yuedongyishoudonghai。