Bobby A Stewart Editor

Dr. Rattan Lal is a Professor of Soil Science in the School of Natural Resources at The Ohio State University. Dr. John M. Kimble is a Research Soil Scientist at the USDA Natural Resources Conservation Service National Soil Survey Laboratory in Lincoln, Nebraska. Dr. Ronald F. Follett s Supervisory Soil Scientist, USDA-ARS, Soil Plant Nutrient Research Unit, Fort Collins, CO. He previously served 10 years as a National Program Leader with ARS headquarters in Beltsville, MD. Dr. Bobby A. Stewart is a Distinguished Professor of Soil Science, and Director of the Dryland Agriculture Institute at West Texas A&M University.