1. Nitrogen management strategies to reduce nitrate leaching in tile-drained midwestern soils;Dinnes;Agronomy Journal,2002
2. United States Geological Survey, Nitrogen in the Mississippi Basin—Estimating Sources and Predicting Flux to the Gulf of Mexico. 〈http://ks.water.usgs.gov/pubs/fact-sheets/fs.135-00.pdf〉, 2000 (accessed 08.08.12).
3. Advances in nitrogen management for water quality;Delgado;Journal of Soil and Water Conservation,2011
4. Final Report: Gulf Hypoxia and Local Water Quality Concerns Workshop;Lemke,2008
5. Seeking a dialog: a targeted technology for sustainable agricultural systems in the US Corn Belt;Christianson;Sustainability: Science Practice and Policy,2011