1. Everglades Research and Education Center Univ. of Florida, Institute of Food and Agricultural Sciences Belle Glade FL 33430 USA
2. Soil and Water Sciences Dep. Univ. of Florida Gainesville FL 32603 USA
3. Saint Johns River Water Management District Palatka FL 32177 USA
4. Dep. of Plant, Soil and Microbial Sciences Michigan State Univ. East Lansing MI 48824 USA