Department of Biosystems Engineering and Soil Science, University of Tennessee Institute of Agriculture, 2506 E. J. Chapman Drive, Knoxville, TN 37996-4531, USA.
Department of Agricultural and Resource Economics, University of Tennessee Institute of Agriculture, 321 Morgan Hall, 2621 Morgan Circle, Knoxville, TN 37996-4518, USA.
Department of Biosystems Engineering and Soil Science, University of Tennessee Institute of Agriculture, 2506 E. J. Chapman Drive, Knoxville, TN 37996-4531, USA.