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