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@ARTICLE{Gomes:863429,
      author       = {Gomes, J. and Brüggemann, N. and Dick, D. P. and Pedroso,
                      G. M. and Veloso, M. and Bayer, C.},
      title        = {{U}rea and legume residues as 15{N}-{N}2{O} sources in a
                      subtropical soil},
      journal      = {Soil research},
      volume       = {57},
      number       = {3},
      issn         = {1838-675X},
      address      = {Collingwood, Victoria},
      publisher    = {CSIRO},
      reportid     = {FZJ-2019-03494},
      pages        = {287 - 293},
      year         = {2019},
      abstract     = {In this work, we used the 15N labelling technique to
                      identify the sources of N2O emitted by a subtropical soil
                      following application of mineral nitrogen (N) fertiliser
                      (urea) and residues of a legume cover crop (cowpea). For
                      this purpose, a 45-day incubation experiment was conducted
                      by subjecting undisturbed soil cores from a subtropical
                      Acrisol to five different treatments: (1) control (no crop
                      residue or fertiliser-N application); (2) 15N-labelled
                      cowpea residue (200 μg N g–1 soil); (3) 15N-labelled urea
                      (200 μg N g–1 soil); (4) 15N-labelled cowpea residue (100
                      μg N g–1 soil) + unlabelled urea (100 μg N g–1 soil);
                      and (5) unlabelled cowpea residue (100 μg N g–1 soil) +
                      15N-labelled urea (100 μg N g–1 soil). Cores were
                      analysed for total N2O formation, δ15N-N2O and δ18O-N2O by
                      continuous flow isotope ratio mass spectrometry, as well as
                      for total NO3–-N and NH4+-N. Legume crop residues and
                      mineral fertiliser increased N2O emissions from soil to 10.5
                      and 9.7 µg N2O-N cm–2 respectively, which was roughly six
                      times the value for control (1.5 µg N2O-N cm–2). The
                      amount of 15N2O emitted from labelled 15N-urea
                      $(0.40–0.45\%$ of 15N applied) was greater than from
                      15N-cowpea residues $(0.013–0.015\%$ of 15N applied).
                      Unlike N-poor crop residues, urea in combination with N-rich
                      residues (cowpea) failed to reduce N2O emissions relative to
                      urea alone. Legume cover crops thus provide an effective
                      mitigation strategy for N2O emissions in relation to mineral
                      N fertilisation in climate-smart agriculture. Judging by our
                      inconclusive results, however, using urea in combination
                      with N-rich residues provides no clear-cut environmental
                      advantage.},
      cin          = {IBG-3},
      ddc          = {640},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000463909500009},
      doi          = {10.1071/SR18300},
      url          = {https://juser.fz-juelich.de/record/863429},
}