Martin C. Rabenhorst, Environmental Science & Technology, University of Maryland-College Park, College Park, MD, US, Patrick J. Drohan, Pennsylvania State University, University Park, PA, John M. Galbraith, School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA, Brian A. Needelman, 1213 HJ Patterson Hall, University of Maryland, College Park, MD, US, Lesley A. Spokas, School of Earth and Sustainability, University of Massachusetts, Amherst, MA, Mark Stolt, 112 Kingston Coastal Institute Bldg, University of Rhode Island, Kingston, RI, US, James A. Thompson, 3115 Agricultural Sciences Building, West Virginia University, Morgantown, WV, US, Bruce L. Vasilas, Department of Plant and Soil Sciences, University of Delaware, Newark, DE and Karen L. Vaughan, 1000 E University Ave., University of Wyoming, Laramie, WY, US