We used the GARDIAN (
gardian.bigdata.cgiar.org) search engine to discover datasets and publications from repositories across the international agricultural research centers of CGIAR and others. Search keywords included Africa fertilizer, maize, fertilizer trials, nitrogen, macronutrient, soil fertility, and Nutrient Omission Trials. We compiled 227 datasets, that had 12,081 maize yield observations distributed in 1141 unique locations across SSA.