1. Dep. of Agronomy and Soils201 Funchess Hall, Auburn Univ. AL 36849
2. USDA‐ARS Plant Sci. Res. Unit and Dep. of Agronomy and Plant GeneticsUniv. of MinnesotaSt. PaulMN55108
3. USDA‐ARS‐NPSBuilding 005, Rm. 212, BARC‐West 103000 Baltimore Ave.BeltsvilleMD20705
4. USDA‐ARS US Dairy Forage Res. Center1925 Linden Drive WestMadisonWI53706