A stylized fact of African agriculture is that crop responses to inorganic fertilizer application derived from experimental studies are often substantially greater than those from observational studies (e.g. surveys and administrative data). Recent debates on relative costs and benefits of...

Improvements in agricultural productivity have alleviated much poverty and starvation and fuelled economic progress. However, comparatively little agricultural R&D and "technology tailoring" has been done for the conditions confronting African agriculture. Innovation in African agriculture and...