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Title:   Author  item
                                            Fujinuma, Ryosukeitem
                                            Venterea, Rodney

                                                         - *Rod*item
                                            RANAIVOSON, ANDRV - University Of Minnesotaitem
                                            MONCRIEF, JOHN - University Of Minnesotaitem
                                            DITTRICH, MARK - Minnesota Department Of Agriculture
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 2/10/2011
                                    Publication  Date: 2/15/2011
                                    Citation: Fujinuma, R., Venterea, R.T., Ranaivoson, A., Moncrief, J., Dittrich, M. 2011. On-site wood-chip bioreactors could reduce indirect nitrous oxide emissions from tile drain waters [abstract]. Proceedings of Nutrient Efficiency and Management Conference. MN Department of Agriculture. February 15, 2011. Abstract #5.Interpretive Summary:
                                Technical Abstract: Indirect nitrous oxide (N2O) emissions originating from nitrate-laden agricultural drainage waters represent approximately 21% of total N2O emissions in the USA. Typical strategies to mitigate indirect N2O emissions are either improving fertilization methods or on-site treatment of drainage water. Recently, wood-chip bioreactors have been shown to reduce nitrate in drainage waters. However, no field studies have evaluated balances between nitrate removal and release of dissolved N2O by on-site wood-chip bioreactors. We measured nitrate-N, dissolved N2O-N, and flow rates of bioreactors in two locations (Dundas, and Claremont, Minnesota, USA) during the 2010 growing season. Drainage waters contained an average of 24 and 16 mg N L-1 of nitrate, and 21 and 9 μg N L-1 of N2O-N in Dundas and Claremont, respectively. Bioreactors reduced nitrate-N concentration in both locations (22-99% in Dundas, 6-77% in Claremont). However, bioreactors reduced N2O-N concentration only in Dundas (average 64%), not in Claremont (increased 21 times). Results indicated that on-site wood-chip bioreactors could mitigate indirect N2O emissions if hydraulic residence time is long enough, and denitrification process goes to completion, i.e., from NO3 to N2.


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