soil fertility grading

例句：

1. 1. The soil fertilitygrading system is crucial for the sustainabledevelopment of agriculture.
   土壤肥力分级系统对于农业的可持续发展至关重要。
2. 2. The farmersare required to follow thesoil fertility grading guidelines during the planting season.
   农民在种植季节需要遵循土壤肥力分级指南。
3. 3. The soil fertility grading results in a more efficient use ofresources and a better crop yield.
   土壤肥力分级结果使得资源使用更加高效，作物产量更好。