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Improving soil fertility management in South Africa : learning through participatory extension approaches / J. Ramaru, Z. Mamabolo and J. Lekgoro.
- IIED. Drylands programme,
- 2000.
- Edinburgh :
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Experiences of farmer participation in soil fertility research in southern Zimbabwe / Blasio Z. Mavedzenge, Felix Murimbarimba and Claxon Mudzivo.
- IIED. Drylands programme,
- 1999.
- Edinburgh :