1. USDA‐ARS, U.S. Dairy Forage Research Center1925 Linden Drive WestMadisonWI53706
2. USDA‐ARS, Cropping System and Water Quality UnitUniv. of MissouriAgric. Engineering BuildingColumbiaMO65211
3. Dep. of Agronomy and Plant GeneticsUniv. of Minnesota1991 Upper Buford CircleSt. PaulMN55108