土壤学

例句：

1. 1. The soil is rich in nutrients that plants need to grow.
   土壤富含植物生长所需的养分。
2. 2. Farmers use different types of soil to plant crops.
   农民使用不同类型的土壤来种植作物。
3. 3. The soil is compacted by heavy machinery, making it difficult for roots to penetrate.
   土壤因重型机械的压实而变得难以让根系穿透。