1. USDA-Agricultural Research Service, Richard B. Russell Agricultural Research Center, P.O. Box 5677, Athens, GA 30604-567. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable.
2. Corresponding author. E-mail: wbarton@qaru.ars.usda.gov
3. USDA-Agricultural Research Service, Rice Research Unit, Route 7, Box 999, Beaumont, TX 77713
4. USDA-Agricultural Research Service, Southern Regional Research Center P. O. Box 19887, New Orleans, LA 70179