1. USDA Forage and Range Research; Utah State Univ.; Logan UT 84322
2. Univ. of Kentucky; Dep. of Plant and Soil Sciences; Lexington KY 40546
3. Dep. of Plant Science; Pennsylvania State Univ.; University Park PA 16802
4. Dep. of Crop and Soil Environmental Sciences; Virginia Polytechnic Institute and State Univ.; Blackstone VA 23824
5. Univ. of Kentucky Research & Education Center; Princeton KY 42445
6. Dep. of Agronomy; Univ. of Wisconsin; Madison WI 53706