1. United States Department of Agriculture–Agricultural Research Service, Columbia Plateau Conservation Research Center, 48037 Tubbs Ranch Road, Adams, Oregon 97810, USA
2. Agricultural and Biological Engineering, University of Illinois at Urbana-University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, USA
3. Illinois Sustainable Technology Center, Prairie Research Institute, Champaign, Illinois 61820, USA
4. Department of Biological and Ecological Engineering, Oregon State University, Corvallis, Oregon 97331, USA