Steven B Mirsky, Sustainable Agricultural Systems Lab, USDA-ARS, Beltsville, MD, Hanna Poffenbarger, Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY, US, Brian Davis, Maryland, University of Maryland, College Park, MD, Michel A. Cavigelli, Bldg 001 Rm 140, USDA-ARS, Beltsville, MD, John T. Spargo, Tower Road, Ag Analytical Services Lab, University Park, PA, Brian A. Needelman, 1213 HJ Patterson Hall, University of Maryland, College Park, MD, US, Jude E Maul, Bldg. 001 rm. 123, USDA-ARS, Beltsville, MD and Stephanie A. Yarwood, Environmental Science and Technology, University of Maryland, Bowie, MD