1. Graduate Student, North Carolina State Univ., Biological and Agricultural Engineering, Campus Box 7625, Raleigh, NC 27695.
2. Associate Professor, Univ. of Florida, Agricultural and Biological Engineering, 18905 SW 280th St. Homestead, FL 33031 (corresponding author).
3. Professor, Univ. of Florida, Agricultural and Biological Engineering, PO Box 110570, Gainesville, FL 32611-0570.
4. Associate Professor, Univ. of Florida, Soil and Water Science, 2685 State Rd. 29 North, Immokalee, FL 34142.
5. Professor, Univ. of Florida, Soil and Water Science, 18905 SW 280th St., Homestead, FL 33031.