Since plant root shape is very not reg ulation, it is very difficult for plant study worker to measure plant root, espe cially to measure absorbing surface area of plant root.

• 但植物根的形状很不规则，对其形状的几何测量对植物研究工作者来说，一直是一件十分困难的工作，特别是根吸收表面积的测量。