1. Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
2. Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Nebraska 68583
3. Department of Statistics, University of Nebraska-Lincoln, Nebraska 68583
4. Department of Agronomy, Iowa State University, Ames, Iowa 50011
5. Department of Crop Sciences, University of Illinois, Urbana, Illinois 61801
6. United States Department of Agriculture (USDA)-Agricultural Research Service (ARS), Beltsville, Maryland 20705
7. USDA-ARS, Urbana, Illinois 61801
8. USDA-ARS, Raleigh, North Carolina 27607
9. Department of Crop and Soil Sciences, North Carolina State University, Raleigh, North Carolina 27607
10. Department of Plant Sciences, University of Missouri, Portageville, Missouri 63873
11. Department of Horticulture and Crop Sciences, Ohio State University, Columbus, Ohio 43210
12. Department of Plant Sciences, Michigan State University, East Lansing, Michigan 48824
13. Department of Agronomy, Kansas State University, Manhattan, Kansas 66506
14. Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, Minnesota 55108
15. Botany and Plant Sciences, University of California, Riverside, California 92521
16. Department of Animal Sciences, Purdue University, West Lafayette, Indiana 47907