人们对于植物,往往只看到它的地上部分,而忽视了生长在地下的根。但是如果切断一株植物的根,它就不能生存,可见根是植物生命攸关的重要器官。如果把整个根系挖出来,人们会看到它在土壤中分布的直径一般比地上冠部的直径大二、三倍以上。根的入土深度,有的比地上部分还长,一株棉花在沃土中,根深可达3米以上。根系的总 For plants, people often only see the aerial parts of it, while ignoring the roots growing underground. But if you cut off the roots of a plant, it can not survive. We can see that the root is an important organ that is vital to the life of a plant. If you dig out the whole root, one will see that it is distributed in the soil generally two or three times the diameter of the ground crown. Root penetration depth, and some even longer than the ground part, a cotton in fertile soil, root depth up to 3 meters. Roots of the total