activity of root system的用法和样例：
- The result indicated that DPC could increase the content of IAA and Z+ZR in root system of peanut seedling,promote the growth of root system and increase activity of root system.
- Effects of peat and weathered coal on activity of rice root system and its nutritional absorption.
- the dry mass of phyllogen, activity of root system and soluble sugar content also presence significant difference.
- Differences in the requirements of plant species for potassium fertilization are often attributable to the kind and activity of the root system.