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| 001 | 863429 | ||
| 005 | 20210130002113.0 | ||
| 024 | 7 | _ | |a 10.1071/SR18300 |2 doi |
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| 024 | 7 | _ | |a 1838-675X |2 ISSN |
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| 037 | _ | _ | |a FZJ-2019-03494 |
| 082 | _ | _ | |a 640 |
| 100 | 1 | _ | |a Gomes, J. |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Urea and legume residues as 15N-N2O sources in a subtropical soil |
| 260 | _ | _ | |a Collingwood, Victoria |c 2019 |b CSIRO |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a 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. |
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| 700 | 1 | _ | |a Brüggemann, N. |0 P:(DE-Juel1)142357 |b 1 |
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| 700 | 1 | _ | |a Pedroso, G. M. |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Veloso, M. |0 P:(DE-HGF)0 |b 4 |
| 700 | 1 | _ | |a Bayer, C. |0 0000-0001-8553-7330 |b 5 |e Corresponding author |
| 773 | _ | _ | |a 10.1071/SR18300 |g Vol. 57, no. 3, p. 287 - |0 PERI:(DE-600)2600572-4 |n 3 |p 287 - 293 |t Soil research |v 57 |y 2019 |x 1838-675X |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/863429/files/Gomes%20etal%202019%20%28Soil%20Research%2057%20287%29%20Postprint%20%28002%29.pdf |y OpenAccess |
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