1. Dep. of Agronomy and Plant Genetics Univ. of Minnesota St. Paul MN 55108
2. Dep. Crop and Soil Science Michigan State Univ. East Lansing MI 48824
3. Coop. Ext., Univ. of Maine Orono MA 04469
4. Dep. of Animal Science Univ. of Minnesota St. Paul MN 55108
5. Southern Exp. Stn. Waseca MN 56093