In order to clarify the alleviation effect of dry-hot wind harm by irrigating in different time after flowering of wheat,four kinds of irrigating modes were chosen as irrigating at 5 d after flowering(W1),ir-rigating at 8 d after flowering(W2), irrigating at 11 d after flowering(W3),and no irrigation after flowe-ring ( CK) .The results showed that at the first day of dry-hot wind the the soil water contents of W1 and W2 treatments were higher than that of W3 and CK treatments.At 5 d after dry-hot wind the soil water contents of W2 and W3 treatments were higher than that of W1 treatment,and the soil water contents of W1,W2 and W3treatments were higher than that of CK.Compared with CK,W1,W2 and W3 treatments could retarding the senescence of wheat leaves .And the leaf functional period order was W2>W1>W3>CK.W1,W2 and W3 treatments could extend the filling period of wheat ,the filling period order was W2>W1>W3>CK,which were 6 d,5 d,4 d longer than that of CK.The 1 000-grain weight and grain yield of W1,W2 and W3 treatments were significantly higher than those of CK,of which order was W2>W1>W3>CK.Compared with CK,grain yield of W2,W1 and W3 treatments increased by 26.5%,17.2%and 11.6%,respectively.Overall,irrigating in different time after flowering all relieved the dry -hot wind harm ,had the positive effect on soil water content,leaf functional period and yield,and W2 treatment had the best combined effect.%设小麦花后不灌水（CK）、花后5 d灌水（W1）、花后8 d灌水（W2）和花后11 d灌水（W3）4个处理，研究了小麦花后发生干热风时不同时间灌溉对麦田含水量、植株功能叶及产量的影响。结果表明，干热风始发日（花后10 d） W1和W2土壤含水量高于W3和CK；干热风后5日W2和W3土壤含水量高于W1，W1、W2、W3土壤含水量均高于CK。与CK相比，各处理均能延缓小麦叶片的衰老，叶片功能期长短表现为W2＞W1＞W3＞CK。各灌水处理均能延长小麦灌浆时间，表现为W2＞W1＞W3＞CK，分别比CK灌浆期延长6 d、5 d、4 d。3个灌水处理的千粒质量和产量均显著高于CK，表现为W2＞W1＞W3＞CK。与CK相比，W2增产26．5％，W1增产17．2％，W3增产11．6％。综上，小麦花后发生干热风时，不同时间灌溉对土壤含水量、叶片功能期及产量均有积极作用，其中W2处理效果最好。
展开▼
