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. 2017 Jun 23;8:1080. doi: 10.3389/fpls.2017.01080

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Copyright © 2017 Omonode, Halvorson, Gagnon and Vyn.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Relationship between N₂O emission and N balance [NNB_(TNU)] due to N source and timing combination applied at (A) preplant, (B) sidedress; (C) due to N source averaged over timing, (D) due to timing averaged over source; relationship between N₂O and surplus N (E) averaged over timing, (F) averaged over N sources; and relationship between N₂O and NRE (G) averaged over N source, and (H) averaged over timing, across Indiana (United States). N = number of observations; for (A,B), n = number of N rate groups and consisted of mean values of 2 observations.