在旱地大田条件下研究了深耘断根对旱地高产小麦花后旗叶衰老及产量的影响。结果表明 ,四个处理中以冬前深耘断根效果最好 ;起身期深耘断根与对照 (不断根 )次之 ,冬前和起身期都深耘断根 ,效果最差。冬前深耘断根可延迟花后旗叶 SOD与 CAT活性、旗叶可溶性蛋白质含量下降及旗叶 MDA含量的升高 ,从而延缓旗叶衰老 ,使产量提高 ,因而在旱地高产麦田应推广冬前深耘断根 The effects of deep root cutting on the flag leaf senescence and yield of high yielding wheat in dry land were studied under dry land conditions. The results showed that in the four treatments, the best effect was obtained by deep-rooted winter cutting; the deep-rooted roots and the control (continuous roots) were the second among the four treatments, and the deep root and root were cut off before winter and rose. Deep-rooted cutting in winter could delay the activity of SOD and CAT, the content of soluble protein in flag leaf and the content of flag leaf MDA in post-anthesis, which delayed the senescence of flag leaf and increased the yield. Therefore, Deep cut off