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. 2017 May 19;7:2185. doi: 10.1038/s41598-017-02278-y

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Denitrification and codenitrification fluxes over time. The codenitrification and denitrification fluxes, over time since ¹⁵N urea addition, are shown as daily N₂ fluxes for (a) soil at −1 kPa (b) soil at −10 kPa and (c) as cumulative codenitrification and denitrification N₂ fluxes, while (d) is the N₂O codenitrification flux, over time since ¹⁵N urea addition, as daily N₂O fluxes. Symbols are means (n = 4) with vertical error bars the standard error of the mean.