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Agricultural Nitrate

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Bachman, L. J., Krantz, D. E., and Böhlke, J. K., 2002, Hydrogeologic framework, ground-water geochemistry, and assessment of nitrogen yield from base flow in two agricultural watersheds, Kent County, Maryland: U.S. Environmental Protection Agency, EPA/600/R-02/008, 93 p. (on-line report in pdf format)
Böhlke, J. K., 2002, Groundwater recharge and agricultural contamination- Erratum: Hydrogeology Journal, v. 10, p. 438-439.
Böhlke, J. K., 2003, Sources, transport, and reaction of nitrate in ground water, in Lindsey, B. D., and others, eds., Residence times and nitrate transport in ground water discharging to streams in the Chesapeake Bay Watershed: U.S. Geological Survey Water Resources Investigations Report 03-4035, p. 25-39.
Böhlke, J. K., Harvey, J. W., and Voytek, M. A., 2004, Reach-scale isotope tracer experiment to quantify denitrification and related processes in a nitrate-rich stream in an agricultural watershed, mid-continent USA: Limnology and Oceanography, v. 49, p. 821-838.
Böhlke, J.K., Wanty, R., Tuttle, M., Delin, G., and Landon, M., 2002, Denitrification in the recharge area and discharge area of a transient agricultural nitrate plume in a glacial outwash sand aquifer, Minnesota: Water Resources Research, v. 38(7), 10.1029/2001WR000663, 200238, p. 10.1-10.26.
Böhlke, J.K., 2002, Groundwater recharge and agricultural contamination: Hydrogeology Journal, v. 10, p. 153-179.
Böhlke, J.K., and Denver, J.M., 1995, Combined use of ground-water dating, chemical and isotopic analyses to resolve the history and fate of ground-water nitrate contamination in two agricultural watersheds, Atlantic coastal plain, Maryland: Water Resources Research, v. 31, p. 2319-2339.
Böhlke, J.K., and Horan, M., 2000, Strontium isotope geochemistry of ground waters and streams affected by agriculture, Locust Grove, Maryland: Applied Geochemistry, v. 15, p. 599-609. (on-line abstract)
Delin, G.N., Healy, R.W., Landon, M.K., and Böhlke, J.K., 2000, Effects of topography and soil properties on recharge and movement of water through the unsaturated zone at two sites in an agricultural field: Journal of the American Water Resources Association, v. 36, part 6, p. 1401-1416. (on-line abstract)
Delin, G.N., Landon, M.K., Nelson, K.J., Wanty, R.B., Healy, R.W., Olsen, H.W., Böhlke, J.K., Schroyer, B.R., and Capel, P.D., 1997, Hydrogeologic and water-quality data used to evaluate the effects of focused recharge on ground-water quality near Princeton, Minnesota, 1991-1995: U.S. Geological Survey Open-File Report 97-21, 47 p.
Groffman, P.M., Altabet, M.A., Böhlke, J.K., Butterbach-Bahl, K., David, M.B., Giblin, A.E., Kana, T.M., Nielsen, L.P., Firestone, M.K., and Voytek, M.A., in press, Methods for measuring denitrification: Diverse approaches to a difficult problem: Ecological Applications.
Katz, B.G. and Böhlke, J.K., 2000, Monthly variability and possible sources of nitrate in ground water beneath mixed agricultural land use, Suwannee and Lafayette Counties, Florida: U.S. Geological Survey Water-Resources Investigations Report 00-4219, 28 p.
Katz, B.G., Hornsby, H.D., and Böhlke, J.K., 1999, Sources of nitrate in water from springs and the Upper Floridan aquifer, Suwannee River basin, Florida: Heathwaite, L., ed., Impacts of Land-Use Change on Nutrient Loads from Diffuse Sources, International Association of Hydrologic Sciences, Publication 257, p. 117-124.
Katz, B.G., Hornsby, H.D., Böhlke, J.K., and Mokray, M.F., 1999, Sources and chronology of nitrate contamination in spring waters, Suwanee River basin, Florida: U.S. Geological Survey Water Resources Investigations Report 99-4252, 54 p. (on-line abstract or to obtain pdf file)
Katz, B.G., Böhlke, J.K., and Hornsby, H.D., 2001, Timescales for nitrate contamination of spring waters, northern Florida, USA: Chemical Geology, v. 179, p. 167-186. (on-line abstract)
Lindsey, B. D., Phillips, S. W., Donnelly, C. A., Speiran, G. K., Plummer, L. N., Böhlke, J. K., Focazio, M. J., Burton, W. C., and Busenberg, E., 2003, Residence times and nitrate transport in ground water discharging to streams in the Chesapeake Bay Watershed, U.S. Geological Survey Water-Resources Investigations Report 03-4035, p. 201.
McMahon, P.B., and Böhlke, J.K., 2006, Regional patterns in the isotopic composition of natural and anthropogenic nitrate in groundwater, High Plains, USA: Environmental Science and Technology, v. 40, p. 2965-2970.
McMahon, P.B., and Böhlke, J.K., 1996, Denitrification and mixing in a stream/aquifer system: effect on nitrate loading to surface water: Journal of Hydrology, v. 186, p. 105-128. (on-line abstract)
McMahon, P.B., Böhlke, J.K., and Bruce, B.W., 1999, Denitrification in marine shales in northeastern Colorado, USA: Water Resources Research, v. 35, p. 1629-1642. (on-line abstract)
McMahon, P.B., Böhlke, J.K., and Litke, D.W., 1995, Fate of nitrate in the South Platte River alluvial aquifer system, Colorado: U.S. Geological Survey Yearbook, Fiscal Year 1994, p. 45-47.
McMahon, P.B., Dennehy, K.F., Bruce, B.W., Böhlke, J.K, Michel, R.L., Gurdak, J.J., and Hurlbut, D.B., 2006, Storage and transit time of chemicals in thick unsaturated zones under rangeland and irrigated cropland, High Plains, USA: Water Resources Research, v. 42 (W03413, doi:10.1029/2005WR004417), p. 1-18.
Oren, O., Yechieli, Y., Böhlke, J. K., and Dody, A., 2004, Contamination of groundwater under cultivated fields in an arid environment, central Arava Valley, Israel: Journal of Hydrology, v. 290, p. 312-328.
Seitzinger, S.P., Harrison, J., Böhlke, J. K., Bouwman, A.F., Lowrance, R.R., Peterson, B.J., Tobias, C.R., and van Drecht, G., 2006, Denitrification across landscapes and waterscapes: a synthesis: Ecological Applications, v. 16, p. 2064-2090.
Smith, L.K., Voytek, M.A., Böhlke, J.K., and Harvey, J.W., in press, Denitrification rates in nitrate-contaminated streams: application of membrane inlet mass spectrometry and isotope tracer methods in flow-through chambers with intact cores: Ecological Applications.
Verstraeten, I.M., Böhlke, J.K., and Kraemer, T.F., 2000, roundwater/ surface-water interactions and sources of nitrogen, radon, and uranium in a irrigated alluvial aquifer, Nebraska, USA: Tracers and Modeling in Hydrogeology, International Association of Hydrologic Sciences Publication 262, p. 525-531. (on-line abstract)
Wanty, R.B., Tuttle, M.L., Landon, M.K., Delin, G.N., and Böhlke, J.K., 1996, Geochemistry of nitrogen in a farmed watershed near Princeton, central Minnesota, in Morganwalp, D.W., and Aronson, D.A., eds., U.S. Geological Survey Toxic Substances Hydrology Program - Proceedings of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993: U.S. Geological Survey Water- Resources Investigations Report 94-4014, p. 591-596. (on-line abstract)