common soil fertility

例句：

1. 1. Thefarmers are trying to improve the common soilfertility in their fields.
   农民们正试图提高他们田地的普遍土壤肥力。
2. 2. The common soil fertilityis crucial for the growth of crops.
   普遍土壤肥力对农作物的生长至关重要。
3. 3. Thecommon soil fertility is a keyfactor in determining crop yields.
   普遍土壤肥力是决定作物产量的关键因素。