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Declining soil fertility and recurrent drought pose serious challenges to farmers in Africas semi-arid regions, where half of all farmland suffers from erosion and nutrient depletion (Cleaver and Schreiber, 1997). In response, farmers and researchers across the continent have experimented with a broad array of soil and water conserving technologies (Reij et al., 1996). This paper describes the development and dissemination of one such technology from Zambia.
Haggblade et al. (2003) studied this question.
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