Research interests are (i) movement of water and pollutants from municipal and agricultural wastes through soils and their underlying strata, (ii) fate and transport of phosphorus in soil, and (iii) characterization of soil materials for agricultural, environmental, and engineering purposes. Research programs include evaluation of soil water and pollutant movement through soil and saprolite, assessment of the fate of and transport of phosphorus from fertilizers with and without fertilizer enhancers, and development of techniques for determination of soil physical properties as related to waste management, engineering, and agricultural practices.