保棉丰、８９１、双效素和缩节胺４种植物生长调节剂型，使棉花产量较对照增产２９．６１％～１０．６１％；霜前产量较对照增加４９．９３％～６．０７％．其中以保棉丰增加棉花产量、提高棉花品质的作用最为明显．试验应用的几种植物生长调节剂型，对棉花叶面积系数、株型和生殖生长与营养生长均有不同程度的协调作用，并可增加棉花叶片叶绿素含量和比叶重． The results showed that cotton yield increased by 29.61% ~ 10.61% compared with the control; the yield before frost increased by 49.93% ~ 6.07 compared with the control %. Among them, cotton bolls to increase cotton yield, improve the quality of cotton most obvious role. Several plant growth regulator formulations tested had different degrees of coordination effects on leaf area coefficient, plant type, reproductive growth and vegetative growth of cotton and increased the chlorophyll content and leaf specific weight of cotton leaves.