1. USDA-ARS; U.S. Dairy Forage Res. Center; 1925 Linden Dr. West Madison WI 53706-1108
2. USDA-ARS; Univ. of Nebraska-East Campus; P.O. Box 830937 Lincoln NE 68583-0937
3. Dep. of Plant & Soil Sciences; Oklahoma State Univ.; Stillwater OK 74078-6028
4. Dep. of Agronomy & Plant Genetics; 1991 Buford Cir. St. Paul MN 55108-6026
5. USDA-ARS; Northern Great Plains Res. Ctr.; P.O. Box 459 Mandan ND 58544
6. Crop and Soil Sciences Dep.; Univ. of Georgia; 111 Riverbend Dr. Athens GA 30602
7. Division of Plant Sciences; Univ. of Missouri; 108 Waters Hall Columbia MO 65211
8. Dep. of Crop, Soil & Environmental Sciences; Univ. of Arkansas; 1366 W. Altheimer Dr. Fayetteville AR 72704-6898