1. a Department of Biological and Agricultural Engineering , University of Georgia , Griffin, GA 30223, USA
2. b Peanut Collaborative Research Support Program (CRSP) , University of Georgia , Griffin, GA 30223, USA
3. c Institute d'Economie Rurale , Bamako, Mali
4. d University of Mississippi Geoinformatics Center , Department of Geology and Geological Engineering , University of Mississippi , MS 38655, USA