John P. Brooks, Genetics and Sustainable Agriculture Research, USDA-ARS, Starkville, MS, Haile Tewolde, Genetics and Sustainable Agricultural Research Unit, USDA-ARS, Mississippi State, MS, Mark W. Shankle, Pontotoc Ridge-Flatwoods Branch Experiment Station, Mississippi State University, Pontotoc, MS, Thomas R. Way, National Soil Dynamics Laboratory, USDA-ARS, Auburn, AL, Ardeshir Adeli, P.O. Box 5367, PO Box 5367, Mississippi State, MS, US, Michael R. McLaughlin, USDA-ARS, Mississippi State, MS and Ian L. Pepper, University of Arizona, Tucson, AZ