colloid index

例句：

1. 1. The colloidal indexof the soil is an important factor indetermining its fertility.
   土壤的胶体指数是决定其肥力的一个重要因素。
2. 2. The colloidal index of thesoil can be affected by various factors,such as rainfall and temperature.
   土壤的胶体指数可以受到各种因素的影响，如降雨和温度。
3. 3. The colloidal indexof the soil is closely related to thegrowth of plants and the productivity of crops.
   土壤的胶体指数与植物的生长和作物的产量密切相关。