采用裂区设计，研究了种植密度和ＥＤＴＡ对短季棉活性氧代谢和铃重的影响。结果表明，随密度上升，短季棉功能叶中ＳＯＤ活性、ＭＤＡ含量分别呈显著下降和增高趋势，幼蕾、花中ＳＯＤ、ＰＯＤ活性呈下降趋势。但密度在６万～９万株·ｈｍ－２范围内，随密度增加并不会导致幼蕾、花中ＳＯＤ、ＰＯＤ活性的显著下降。ＥＤＴＡ减缓了功能叶中ＳＯＤ活性下降和脂质过氧化产物的积累，提高叶绿素和蛋白质含量，延缓叶片衰老；增强幼蕾、花中ＳＯＤ和ＰＯＤ活性，具增铃增铃重的效果。同时，密度在９万株·ｈｍ－２时，ＥＤＴＡ的增铃重效应较佳，且总铃数和伏桃比例也高 Using split-plot design, the effect of planting density and EDTA on reactive oxygen species metabolism and boll weight in short-season cotton was studied. The results showed that with the increasing of density, the activities of SOD and MDA in the leaves of short season cotton decreased and increased, while the activities of SOD and POD in young bud and flower decreased. However, with the density ranging from 60,000 to 90,000 hm-2, with the increase of density, the activities of SOD and POD in young buds and flowers were not significantly decreased. EDTA slowed the decline of SOD activity and the accumulation of lipid peroxidation products, increased the content of chlorophyll and protein, delayed the leaf senescence, enhanced the activities of SOD and POD in young buds and flowers, and increased the boll weight. At the same time, the effect of increasing boll weight of EDTA was better, and the total number of bolls and the ratio of volcanic peaches were also high at the density of 90 000 plants · hm-2