Dr. Andersen’s research interests are in the areas of manure management and water quality. Speciﬁcally the areas of manure treatment and nutrient management planning, ﬁeld and farm scale soil and water quality monitoring and modeling, and economic evaluations of agricultural waste management alternatives. As part of his manure treatment efforts he works on anaerobic digestion systems, nutrient separation and recovery, and integration of physical, chemical, and biological waste treatment methods in agricultural systems. His work has also provided solid experiences in monitoring aspects of the carbon, nitrogen, and phosphorus cycles in agroecosystems, quantifying and mitigating nutrient transport from agriculture, and evaluate the impact of manure application on soil physical and chemical properties. Much of his current work focuses on anaerobic digestion, nutrient management and conservation, and the control of feedlot runoff.