一、前言华北地区小麦灌浆至成熟阶段,常出现高温、大气干旱或干热风天气,使小麦植株蒸腾和根系吸水的平衡遭到破坏,影响籽粒灌浆,造成青干逼熟,减产幅度很大。青干逼熟的小麦,一般千粒重降低2—3克,减产5—10％,严重时千粒重可降低5—6克,减产达30％以上。在高产地区遇到青干 I. INTRODUCTION The wheat in the North China is grouted to the maturity stage, often with high temperature, atmospheric drought or hot and cold wind weather. The balance between transpiration and root water absorption of wheat plants is destroyed, which will affect the grain filling and result in a sharp decrease in yield. Green dry cooked wheat, the general 1000-grain weight reduction of 2-3 grams, 5-10% reduction in severe grain weight can be reduced 5-6 grams, a reduction of more than 30%. Encounter youth in high-yield areas