高效唑是一种高效植物抑制剂，在水稻、大麦、小麦、油菜、花卉等作物上有诸多应用功效川。作者采用二次旋转通用回归设计，在不同大麦生长期施用最后建立二次回归方程，分析探讨不同时期应用对大麦产量和株高性状的影响。五材料与方法1．1材料及施用方法二校啤酒大麦KA－4B， Paclobutrazol is a highly effective plant inhibitor and has many applications in crops such as rice, barley, wheat, rape and flowers. The authors used the common quadratic regression design to establish the quadratic regression equation in different barley growth stages and analyzed the effects of different periods on the yield and plant height traits of barley. Five materials and methods 1.1 Materials and methods of application Two school beer barley KA-4B,