info:oai:icrisat:63info:ofi/fmt:xml:xsd:journalYamoahC FYamoah, C FBationoABationo, AShapiroBShapiro, BKoalaSKoala, SUse of rainfall indices to analyze the effects of phosphate rocks on millet in the SahelAfrican Journal of Agricultural Research1991-637X20116586-5933article