無障礙扶手廠家(jia)提(ti)供信息      河北中部(bu)麥田受(shou)災較重(zhong)就與(yu)當年冬春季氣(qi)(qi)溫偏高、小(xiao)麥發(fa)育(yu)進程(cheng)(cheng)提(ti)前有一(yi)些關(guan)系。保(bao)水保(bao)肥力差(cha)的(de)沙土地(di)(di)(di)(di)凍(dong)(dong)(dong)害(hai)(hai)(hai)重(zhong)于壤土與(yu)粘土地(di)(di)(di)(di)；地(di)(di)(di)(di)勢(shi)低洼處凍(dong)(dong)(dong)害(hai)(hai)(hai)重(zhong)于平地(di)(di)(di)(di)和(he)坡(po)崗地(di)(di)(di)(di)，石家(jia)莊以南欒城、寧晉發(fa)生(sheng)晚霜凍(dong)(dong)(dong)害(hai)(hai)(hai)，寧晉一(yi)帶受(shou)災較重(zhong)就與(yu)其地(di)(di)(di)(di)勢(shi)低有關(guan)。同一(yi)區域，整地(di)(di)(di)(di)質量好、苗壯、群(qun)體(ti)大的(de)地(di)(di)(di)(di)塊凍(dong)(dong)(dong)害(hai)(hai)(hai)輕(qing)，秸稈還田、整地(di)(di)(di)(di)質量差(cha)、群(qun)體(ti)小(xiao)的(de)凍(dong)(dong)(dong)害(hai)(hai)(hai)重(zhong)。晚霜凍(dong)(dong)(dong)的(de)發(fa)生(sheng)時(shi)(shi)間(jian)、低氣(qi)(qi)溫和(he)小(xiao)麥生(sheng)育(yu)進程(cheng)(cheng)、群(qun)體(ti)大小(xiao)基本決定了凍(dong)(dong)(dong)害(hai)(hai)(hai)危害(hai)(hai)(hai)程(cheng)(cheng)度(du)。小(xiao)麥生(sheng)育(yu)進程(cheng)(cheng)與(yu)受(shou)凍(dong)(dong)(dong)程(cheng)(cheng)度(du)關(guan)系密(mi)切，即便同一(yi)株小(xiao)麥，是大部(bu)分(fen)麥穗(sui)受(shou)凍(dong)(dong)(dong)、甚至不抽穗(sui)，還是僅主莖(jing)穗(sui)或分(fen)蘗穗(sui)上某個部(bu)位受(shou)凍(dong)(dong)(dong)，要(yao)看凍(dong)(dong)(dong)害(hai)(hai)(hai)發(fa)生(sheng)時(shi)(shi)間(jian)與(yu)各穗(sui)發(fa)育(yu)進程(cheng)(cheng)。

無障礙扶手廠家提供      拔節期間(jian)嚴重霜凍(dong)(dong)導致不(bu)抽穗(sui)或(huo)整(zheng)穗(sui)被凍(dong)(dong)死的(de)(de)(de)比例較(jiao)(jiao)高；霜凍(dong)(dong)發生(sheng)較(jiao)(jiao)晚(wan)(wan)(wan)(wan)時(shi)，多(duo)見處于某一(yi)發育節點(dian)的(de)(de)(de)麥穗(sui)局部小穗(sui)或(huo)小花受(shou)凍(dong)(dong)，這點(dian)在稀植、單(dan)株穗(sui)數較(jiao)(jiao)多(duo)的(de)(de)(de)單(dan)株圃(pu)或(huo)穗(sui)行(xing)圃(pu)中表(biao)現明顯。播(bo)(bo)期和播(bo)(bo)量(liang)通過影(ying)(ying)響麥苗長勢、群體大(da)小來影(ying)(ying)響小麥抗(kang)晚(wan)(wan)(wan)(wan)霜凍(dong)(dong)能力(li)。群體大(da)的(de)(de)(de)麥田，密實葉片(pian)能有效阻(zu)礙一(yi)掃(sao)而過的(de)(de)(de)冷(leng)空氣侵入冠層內部，降(jiang)低麥穗(sui)凍(dong)(dong)傷比例與程度。反(fan)之，播(bo)(bo)期晚(wan)(wan)(wan)(wan)、群體小的(de)(de)(de)麥田易嚴重受(shou)害。春(chun)季灌水早晚(wan)(wan)(wan)(wan)也通過影(ying)(ying)響麥苗長勢、群體大(da)小來影(ying)(ying)響小麥抗(kang)晚(wan)(wan)(wan)(wan)霜凍(dong)(dong)能力(li)。返(fan)青后期或(huo)起身初期追肥澆水的(de)(de)(de)晚(wan)(wan)(wan)(wan)播(bo)(bo)麥田3下(xia)旬至(zhi)4月下(xia)旬遇晚(wan)(wan)(wan)(wan)霜凍(dong)(dong)時(shi)，由于有了較(jiao)(jiao)多(duo)的(de)(de)(de)春(chun)生(sheng)分蘗使得(de)群體較(jiao)(jiao)大(da)，受(shou)凍(dong)(dong)就(jiu)比較(jiao)(jiao)輕。

無障礙扶手廠家提供(gong)      的(de)確澆(jiao)水(shui)(shui)(shui)(shui)(shui)早的(de)晚(wan)(wan)(wan)播(bo)麥(mai)田受凍(dong)(dong)輕，但剛澆(jiao)水(shui)(shui)(shui)(shui)(shui)就(jiu)遇霜(shuang)凍(dong)(dong)的(de)晚(wan)(wan)(wan)播(bo)麥(mai)田反而受害重(zhong)，含(han)水(shui)(shui)(shui)(shui)(shui)量(liang)高(gao)的(de)組織易受凍(dong)(dong)害；剛澆(jiao)水(shui)(shui)(shui)(shui)(shui)麥(mai)田喇叭口處易凝結露水(shui)(shui)(shui)(shui)(shui)，露水(shui)(shui)(shui)(shui)(shui)結冰加重(zhong)霜(shuang)凍(dong)(dong)危(wei)害，心(xin)葉自喇叭口處以上(shang)部位(wei)常被凍(dong)(dong)死，凍(dong)(dong)死心(xin)葉初(chu)期水(shui)(shui)(shui)(shui)(shui)浸(jin)狀，進而干枯影響新葉生出乃(nai)至抽穗。小麥(mai)生育進程(cheng)遲于河南，除(chu)邯(han)鄲地區(qu)外，其(qi)他地區(qu)因晚(wan)(wan)(wan)霜(shuang)凍(dong)(dong)造(zao)(zao)成嚴(yan)重(zhong)減產的(de)幾(ji)率還是(shi)較(jiao)低的(de)。對于晚(wan)(wan)(wan)霜(shuang)凍(dong)(dong)害，目(mu)前尚無(wu)良法從(cong)根本上(shang)解(jie)決(jue)問題。預(yu)防(fang)晚(wan)(wan)(wan)霜(shuang)凍(dong)(dong)造(zao)(zao)成嚴(yan)重(zhong)危(wei)害，要適期播(bo)種，合理密(mi)植，保證(zheng)發生晚(wan)(wan)(wan)霜(shuang)凍(dong)(dong)時有足夠(gou)的(de)群體，晚(wan)(wan)(wan)播(bo)麥(mai)要早澆(jiao)水(shui)(shui)(shui)(shui)(shui)追肥促春生分蘗；起身期結合化學除(chu)草，凍(dong)(dong)害前施用這類葉面(mian)肥對預(yu)防(fang)、緩解(jie)藥凍(dong)(dong)害有作用。