| Success in obtaining the required output of food from agriculture depends on soil fertility. |
| Special trees were planted to create woody perennials to improve the microclimate and increase soil fertility. |
| Millions of tenant farmers in the developing world have little incentive to invest in land improvements, rotate crops or improve soil fertility. |
| These sites had greater light, moisture, and soil fertility than mature forests or summer clearcuts. |
| He criticised modern methods of cultivation and pointed out that the use of chemical fertilisers had affected soil fertility. |
| The trials will investigate the suitability of different potato varieties and the influence of soil fertility on potato blight. |
