1. a Soil Scientist, The Land‐EPCOT Center, P. O. Box 10,000, Lake Buena Vista , FL , 32830
2. b Professor of Soil Fertility, Soil Science Department , University of Florida , 106 Newell Hall, Gainesville , FL , 32611
3. c Associate Professor of Soil Chemistry, Soil Science Department , University of Florida , 106 Newell Hall, Gainesville , FL , 32611