1. Dep. of Agronomy; Univ. of Kentucky; N-122 Ag. Science North Lexington KY 40546-0091
2. Center for Precision Agricultural Systems; Washington State Univ.; Irrigated Agricultural Research and Extension Center; 24106 N. Bunn Road Prosser WA 99350-8694
3. Dep. of Statistics; Virginia Polytechnic Institute and State Univ.; 211 Hutcheson Hall Blacksburg VA 24061-0439
4. Dep. of Crop and Soil Science; Michigan State Univ.; E. Lansing MI 48824-1325