The basic point of the two designs is to reduce the size of incomplete block, by using principle of confounding, to make fewer homogeneous experimental units fit to the size of incomplete block.

• 这两种设计的基本特点是采用混杂的原理缩小不完全区组的大小，使较少的基因型同质试验单元可安排一个不完全区组所需的处理。