Abstract
This paper proposes a strategy of technology development for the semi-arid regions of two Sahelian countries. Improved agronomic practices, especially water conservation and increased soil fertility, are principal constraints in the semi-arid Sahel to increasing cereal yields. Previous concentration upon breeding rather than the dual constraints of water availability and soil fertility appears to be one explanation for the failure to date to develop new agricultural technologies in the Sahelian semi-arid region. Other requirements for these agronomic technologies are discussed and the interactions between the principal agroclimatic zones within the region are considered. Finally, the issue of the substitution between organic and inorganic fertilizers is evaluated with data on comparative costs.
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