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- Contribution No. 7874 and Scientific Article No. A‐4847 of the Maryland Agricultural Experiment Station, Agronomy Department, University of Maryland, College Park, MD 20742. This work was supported in part by funds provided by the Tennessee Valley Authority, Delmarva Poultry Industry, Agway, Inc., and Chevron Chemical Company.
- Soil Scientist, ARS, USDA, Beltsville, MD; Professor, University of Maryland; Microbiologist, ARS, USDA, Beltsville, MD; formerly Plant Physiologist, ARS, USDA, Beltsville, MD.