| 1. | Farmers rotate their crops so that the soil will remain fertile .
为保持土壤肥力，农民搞作物轮作。 |
| 2. | The abundance and availability of water and nutrients in a soil ecosystem determine its fertility .
土壤生态系统中水分和养分的丰度和有效性决定土壤的肥力。 |
| 3. | Improvements in drainage and fertility levels are in themselves methods of reducing the incidence of some of these weeds .
改进排水和肥力水平本身就是减少某些杂草生长的方法。 |
| 4. | Soybeans have been grown continuously in some areas without serious losses in yield when fertility is maintained .
当肥力得到保持的时候，在某些地区连续种植大豆，不会严重减产。 |
| 5. | When cultivated and stripped of their dense vegetative cover, soils of the humid tropics quickly lose their fertility .
当将厚密的植被除去并耕种时，潮湿热带地区的土壤就会迅速失去其肥力。 |
| 6. | The trends of the research on soil fertility information system
土壤肥力信息系统研究动态 |
| 7. | Evolution of soil fertility in taihu region and its causes
太湖流域土壤肥力演变及原因分析 |
| 8. | Research progress in the integrated evaluation of soil fertility
土壤肥力综合评价研究进展 |
| 9. | The rotation of crops keeps the soil healthy and fertile
谷物轮种使土壤保持了肥力和高质。 |
| 10. | Soil fertility restoration on degraded upland of purple soil
紫色土退化旱地的肥力恢复与重建 |
