1. Senior Research Scientist, Texas AgriLife Research, Blackland Research and Extension Center, 720 East Blackland Rd., Temple, TX 76502.
2. Assistant Research Scientist, Texas AgriLife Research, Blackland Research and Extension Center, 720 East Blackland Rd., Temple, TX 76502 (corresponding author).
3. Research Assistant Professor, Texas AgriLife Research, Blackland Research and Extension Center, 720 East Blackland Rd., Temple, TX 76502.
4. Associate Research Scientist, Texas AgriLife Research, Blackland Research and Extension Center, 720 East Blackland Rd., Temple, TX 76502.
5. Supervisory Agricultural Engineer, Agricultural Research Service, United States Dept. of Agriculture, Blackland Research and Extension Center, 802 East Blackland Rd., Temple, TX 76502.