1. Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD, 57007, U.S.A.
2. Agricultural and Biosystems Engineering, Iowa State University, Ames, IA, 50011, U.S.A.
3. Corresponding author. Phone: (515) 294-4019. E-mail: karosent@iastate.edu
4. Department of Natural Resources Management, South Dakota State University, Brookings, SD, 57007, U.S.A.