upper horizon soil

例句：

1. 1. Theupper horizon soil is rich in nutrients,making it an ideal location for growing crops.
   上界土壤富含养分，是种植作物的理想之地。
2. 2. The farmerscarefully managed the upper horizonsoil to ensure optimal crop growth.
   农民们精心管理上界土壤，以确保作物的最佳生长。
3. 3. The upperhorizon soil was analyzed todetermine its pH level and nutrient content.
   对上界土壤进行了分析，以确定其pH水平和营养成分。