1. a USDA-ARS, National Soil Dynamics Laboratory , Auburn, AL, USA
2. b USDA-ARS, J. Phil Campbell Sr. - Natural Resource Conservation Center , Watkinsville, GA, USA
3. c Department of Horticulture , Auburn University , AL, USA
4. d Alabama Agricultural Experiment Station , Crossville, AL, USA
5. e USDA-ARS, Dale Bumpers Small Farms Research Center , Booneville, AR, USA