Milica Radanovic^1,2, David Huggins³, Tarah S Sullivan⁴ and R Dave Evans^1,2, (1)Washington State University, School of Biological Sciences, Pullman, WA, United States, (2)Washington State University, WSU Stable Isotope Research Facility, Pullman, WA, United States, (3)USDA-ARS Plains Area, Northwest Sustainable Agroecosystems Research, Pullman, WA, United States, (4)Washington State University, Department of Crop and Soil Sciences, Pullman, United States