研究结果表明,严重水分胁迫影响玉米产量形成的关键时期是孕穗期。此期干旱单株叶面积日均减少176.6—181.7cm~2,雄穗严重败育。采用抗旱性强的品种或人工辅助授粉,可减少产量损失。苗期受旱有促进根系下扎,根量增加的作用。拔节期受早对生长发育及产量影响较轻。 The results showed that the critical period of severe maize stress affecting maize yield was booting stage. During this period, the average single leaf area of ​​arid decreased by 176.6-181.7 cm ~ 2, and the tassel was severely aborted. Using drought-resistant varieties or artificial pollination, can reduce the yield loss. Seedling drought can promote under the root bar, root volume increased role. The early jointing stage had little effect on the growth and yield.