Water Resources Research Act Program

Principal Investigators: Larry Geohring

Abstract: Denitrifying bioreactors (DNBRs) have the potential to reduce nitrogen (N) loading to streams in agricultural watersheds. By passing the nitrate-rich waters of tile- drained fields through a system engineered for denitrification, the total loading of N is reduced before entering sensitive aquatic ecosystems. This project will characterize the biophysical and farm management impacts on N removal in these reactors. N reduction potential in a watershed with multiple DNBRs will be projected by extrapolating N removal rates based on key factors identified in the experimental data. Results will assist management efforts in heavily agricultural areas as nutrient regulations increase.