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Title:   Author  item
                                            STROCK, J - UNIV OF MINNESOTAitem
                                            ANDERSON, J - UNIV OF MINNESOTAitem
                                            APLAND, J - UNIV OF MINNESOTAitem
                                            DITTRICH, M - MN DEPT OF AGitem
                                            MAGNER, J - MPCA ST PAUL MNitem
                                            RICHARDSON, W - US GEOLOGICAL SURVEYitem
                                            SADOWSKY, M - UNIV OF MINNESOTAitem
                                            SANDS, G - UNIV OF MINNESOTAitem
                                            Venterea, Rodney

                                                         - *Rod*
  Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 7/16/2003
                                    Publication  Date: 11/2/2003
                                    Citation: Strock, J.S., Anderson, J.L., Apland, J.D., Dittrich, M., Magner, J.A., Richardson, W.B., Sadowsky, M.J., Sands, G.R., Venterea, R.T. 2003. Mitigation of agricultural runoff in open-ditch ecosystems. ASA-CSSA-SSSA Annual Meeting Abstracts. Abstract No. S06-strock648718-poster.Interpretive Summary:
                                Technical Abstract: The rate of nitrogen removal in streams and rivers has been shown to decline rapidly with increasing channel size. Headwater streams and open-ditches that directly receive surface and subsurface runoff from agricultural land result in the transport of potentially high loads of contaminants. The objectives of this on going study are to investigate how hydrologic regimes, biological systems and land use influence nitrogen processing, storage, and biological removal within open-ditch systems. Our methods include measurement of physical, chemical, and biological characteristics of open-ditch ecosystems, and evaluation of management strategies in two study areas located in the Cottonwood River Major Watershed in southwestern Minnesota. Denitrification and biological assimilation are two transformation processes that will likely have an effect on reductions in nitrate concentration and load along the length of an open-ditch or stream. Overall we are using a systems approach to managing nitrogen in agricultural landscapes through responsible nitrogen application from all sources, and various strategies to minimize nitrogen losses from agricultural land, including the use of open-ditches. Information on these ecosystems, along with information on nitrogen cycling and transport, and open-ditch management may prove to be applicable to other regions that are similar in terms of agricultural production systems, soils, climate, and topography.


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