1. USDA-ARS; Soybean and Nitrogen Fixation Unit; 3127 Ligon St. Raleigh NC 27607
2. Statistics Dep.; North Carolina State Univ.; Raleigh NC 27695
3. USDA-ARS, Market Quality and Handling Research Unit, Box 7631; North Carolina State Univ.; Raleigh NC 27695-7361
4. Dep. of Crop Science; North Carolina State Univ.; Raleigh NC 27607
5. Dep. of Crop and Soil Sciences, Center for Applied Genetic Technologies; Univ. of Georgia; 111 Riverbend Rd. Athens GA 30602