21. Meanwhile, soil fertility in the east fell, especially for inland rice. 22. Over-cultivation diminished soil fertility , cutting harvests by a third between 1990 and 1993. 23. Soil fertility can be severely challenged when land use changes rapidly.24. Foliage of locust bean has been found to contribute to soil fertility improvement. 25. This could help farmers in regions with poor soil fertility . 26. Often, nothing is given back to the soil; soil fertility therefore suffers and plummets. 27. Soil fertility can be increased and maintained by enhancing the natural soil biological processes.28. Like other acacias and Fabaceae it is a nitrogen fixer, so improves soil fertility . 29. The blood dripping from the wound constitutes an offering to ancestors for soil fertility . 30. He searched for natural ways to manage soil fertility and weeds in tropical farmlands.
