soil fertility index

例句：

1. 1. The soil fertility index is an important factor in determining the success of a plant's growth.
   土壤肥力指数是决定植物生长成功的重要因素。
2. 2.The soil fertility index is closely related to the quality of the soil, which affects the growth and development of plants.
   土壤肥力指数与土壤质量密切相关，影响植物的生长和发展。
3. 3. To improve soil fertility, farmers often use organic fertilizers and practices such as composting and crop rotation.
   为了提高土壤肥力，农民们经常使用有机肥料和堆肥等做法。