1. Dep. of Horticulture and Landscape Architecture Purdue Univ. 625 Agriculture Mall Dr. West Lafayette IN 47907
2. Dep. of Crop & Soil Sciences Univ. of Georgia 2360 Rainwater Rd. Tifton GA 31793
3. Dep. of Agronomy Univ. of Florida PO Box 110500 Gainesville FL 32611