由于棉花根系生长在地表下肉眼观察不到，而且分布广，再加上土壤及地上部各种复杂因素的影响，使得根系研究比较困难。在过去许多学者探索出来的根系研究方法中都有许多不尽人意的地方，如称重法只能得出根系的重量，不能得知根系的长度、分布范围以及根系的吸收表面积；... Because root growth of cotton under the surface of the naked eye can not be observed, and widely distributed, coupled with the impact of various complex soil and aboveground factors, making the root system more difficult. In the past many scholars have explored the roots of research methods are many unsatisfactory places, such as weighing method can only get the root weight, can not know the length of the root system, distribution and root absorption surface area;