Soil biochemistry and soil analytical chemistry; carbon and nitrogen cycles; transformation and transport of nitrogen, pesticides, allelochemicals, and organic matter in the soil environment; residue management, nitrogen availability and use efficiency, and ground water quality; climatic effects on carbon and nitrogen transformation dynamics; landscape approach to soil resource management.

B.A., Agricultural Science, Berea College, Berea, KY, 1956
M.S., Agronomy, University of Illinois, Urbana, IL, 1958
Ph.D., Soil Science, University of Illinois, Urbana, IL, 1961