1. a Professor, Department of Agronomy , University of Kentucky , Lexington , Kentucky
2. b Professor, Department of Soil Science , University of Florida , Gainesville
3. c Professor, Department of Vegetable Crops , University of Florida , Gainesville
4. d Research Agronomist USDA‐ARS , Auburn University , Alabama
5. e Professor, Department of Agronomy and Soils , Auburn University , Alabama