1. Former Ph.D. Candidate, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Box 7625, Raleigh, NC 27695 (corresponding author).
2. Extension Specialist, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Box 7637, Raleigh, NC 27695.
3. Associate Professor and Extension Specialist, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Box 7625, Raleigh, NC 27695.