1. Postdoctoral research associate, Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN 37919.
2. Agricultural and Bioprocess Engineer, North Central Agricultural Research Laboratory, USDA-ARS, 2923 Medary Ave., Brookings, SD 57006. Mention of a trade name, propriety product or specific equipment does not constitute a guarantee or warranty by the United States Department of Agriculture and does not imply approval of a product to the exclusion of others that may be suitable.
3. Corresponding author. Phone: (605) 693-3241. Fax: (605) 693-5240. E-mail: krosentr@ngirl.ars.usda.gov
4. Professor, Department of Agricultural and Biosystems Engineering, South Dakota State University, Brookings, SD 57007.