The Atlas of African Agriculture Research & Development is a multifaceted resource that high­lights the ubiquitous nature of smallholder agriculture in Africa; the many factors shaping the location, nature, and performance of agricultural enterprises; and the strong interde­pendencies among farming, natural resource stocks and flows, rural infrastructure, and the well-being of the poor.

The Atlas of African Agriculture Research & Development is a multifaceted resource that high­lights the ubiquitous nature of smallholder agriculture in Africa; the many factors shaping the location, nature, and performance of agricultural enterprises; and the strong interde­pendencies among farming, natural resource stocks and flows, rural infrastructure, and the well-being of the poor.

The Atlas of African Agriculture Research & Development is a multifaceted resource that high­lights the ubiquitous nature of smallholder agriculture in Africa; the many factors shaping the location, nature, and performance of agricultural enterprises; and the strong interde­pendencies among farming, natural resource stocks and flows, rural infrastructure, and the well-being of the poor.

This publication presents a GIS-based approach for revising the definitions of global maize production environments, called “mega-environments” (MEs), used by CIMMYT and its partners. A cluster analysis was performed on climate data, representing a four-month growing season, for key maize producing locations. Assuming rainfed production, the onset of the growing season was determined based on the month when the ratio of precipitation over potential evapotranspiration exceeds 0.5. Diagnostic criteria for mapping MEs were based on cluster analysis results and expert knowledge. The resulting maps can be used to select appropriate target environments for maize germplasm and trials, as well as in priority setting and site selection for global maize breeding programs.