1. USDA-ARS, Crop Genetics & Environmental Research, Building #350, P.O. Box 110965; University of Florida; Gainesville FL 32611-0965
2. USDA-ARS; Columbia Plateau Conservation Research Center; P.O. Box 370 Pendleton OR 97801-0370
3. Agronomy Department, 304 Newell Hall, P.O. Box 110500; University of Florida; Gainesville FL 32611-0500