引言冬小麦的产量是由单位面积内的株数及单株的生产力所决定的。单位面积内株数是决定麦田群体结构的基本因素,单株生产力则是个体生长发育的最后结果。几年来丰产经验证明,增株、增穗、大穗、重粒是争取高额丰产的主攻目标(1)。 INTRODUCTION The yield of winter wheat is determined by the number of plants per plant and the productivity of the plant. The number of stalks per unit area is the basic factor that determines the structure of wheat field and the individual productivity is the final result of individual growth and development. Years of experience in high yield shows that increasing strains, increasing spike, big spike and heavy grain are the main targets for high yield (1).