Russell L Scott¹, Phil Heilman², David C Goodrich³, Mary Nichols¹, Mark Almon Nearing⁴, C. Jason Williams¹ and Joel A Biederman⁵, (1)USDA-ARS, Southwest Watershed Research Center, Tucson, AZ, United States, (2)Agricultural Research Service Tucson, Tucson, AZ, United States, (3)Agricultural Research Service, Tucson, AZ, United States, (4)USDA ARS, Pendleton, OR, United States, (5)University of Arizona, Tucson, AZ, United States