1. Soil and Water Science Dep. Univ. of Florida Gainesville FL 32611‐0510 USA
2. Agronomy Dep. Univ. of Florida Gainesville FL 32611‐0510 USA
3. Agricultural and Biological Engineering Dep. Univ. of Florida Gainesville FL 32611‐0570 USA
4. Horticultural Science Dep. Univ. of Florida Gainesville FL 32611‐0690 USA
5. North Florida Research and Education Center Route 3 Box 4370 Quincy FL 32351‐9529 USA