Jorge A. Delgado1, Sharon L Weyers2, Curtis J. Dell3, Daren Harmel4, Bruce Vandenberg5, Greg Wilson5, Jennifer Carter5, Nancy Barbour6, Peter J. A. Kleinman7, Karamat R Sistani8, April B. Leytem9, David R. Huggins10, Timothy Strickland11, Newell R Kitchen12, John J. Meisinger13, Stephen Del Grosso14, Jane M-F Johnson15, Kipling S. Balkcom16, John Finley17, Naomi Fukagawa17, J. Mark Powell18 and Robert Scott Van Pelt19, (1)USDA-ARS, Fort Collins, CO, US, (2)803 Iowa Avenue, USDA-ARS, Morris, MN, US, (3)USDA-ARS Pasture Systems & Watershed Mgmt Research Unit, State College, PA, US, (4)USDA-ARS, Fort Collins, CO, (5)ARS, USDA, Fort Collins, CO, (6)North Central Soil Conservation Laboratory, USDA-ARS, Morris, MN, (7)USDA-ARS-Soil Management and Sugarbeet Research Unit, USDA-ARS, Fort Collins, CO, (8)Food Animal Environmental Systems Research Unit, USDA-ARS, Bowling Green, KY, US, (9)USDA-ARS, Kimberly, ID, (10)USDA-ARS, Pullman, WA, (11)Southeast Watershed Research Lab, USDA-ARS, Tifton, GA, (12)USDA-ARS Cropping Systems & Water Quality Research Unit, Columbia, MO, (13)USDA-ARS, Beltsville, MD, (14)Agricultural Research Service, United States Department of Agriculture, Fort Collins, CO, (15)USDA-ARS, Morris, MN, US, (16)USDA-ARS, Auburn, AL, (17)USDA-ARS, BELTSVILLE, MD, (18)1925 Linden Drive, USDA-ARS, Madison, WI, (19)USDA-ARS, Big Spring, TX