The population structure of compact corn hybrid Yu Yu 2 and Yu Yu 5 havebeen investigated in six experimental stations in 1988 and 1989 by using the or-thogonal regression gyration design.

• 本文利用正交回归旋转设计,以目前生产上推广应用的紧凑型玉米杂交种豫玉2号、豫玉5号为代表,两年在6个试点作了8次群体结构试验。