1. Ph.D. Candidate, Agricultural and Biological Engineering, Univ. of Florida, 1741 Museum Rd., P.O. Box 110570, Gainesville, FL 32611-0570.
2. Professor, Agricultural and Biological Engineering, Univ. of Florida, 1741 Museum Rd., P.O. Box 110570, Gainesville, FL 32611-0570 (corresponding author).