fertility erosion

例句：

1. 1. The soil's fertility is crucial for thegrowth of crops.
   土壤的肥力对农作物的生长至关重要。
2. 2. The farmer has been workinghard to improve the land's fertility.
   这位农民一直在努力提高土地的肥力。
3. 3. Fertility testing isessential for monitoring the health of farm animals.
   对农场动物进行肥力测试是监测其健康状况的关键。