Amanda M Nelson1, Daniel N. Moriasi2, Mansour Talebizadeh3, Jean L. Steiner4, Rem Confesor Jr.5, Prasanna H. Gowda6, Patrick Starks3 and Haile K. Tadesse7, (1)141 Experiment Station Road, USDA-ARS Sustainable Water Management Research Unit, Stoneville, MS, (2)Grazinglands Research Laboratory, USDA-ARS Grazinglands Research Laboratory, El Reno, OK, US, (3)Grazinglands Research Laboratory, USDA-ARS, El Reno, OK, (4)7207 W Cheyenne Street, USDA-ARS Grazinglands Research Laboratory, El Reno, OK, (5)National Center for Water Quality Research, Heidelberg University, Tiffin, OH, (6)USDA-ARS Grazinglands Research Laboratory, El Reno, OK, (7)USDA-ARS, Tifton, GA, US