1. USDA‐ARS Plant Sci. Res. Unit and Dep. of Agronomy and Plant GeneticsUniv. of MinnesotaSt. PaulMN55108
2. Southern Exp. Stn., Univ. of MinnesotaWasecaMN56093
3. USDA‐ARS Soil and Water Management Research Unit and Dep. of Soil ScienceUniv. of MinnesotaSt. PaulMN55108
4. Dep. of Agronomy and Plant GeneticsUniv. of MinnesotaSt. PaulMN55108