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. 2017 Jan 17;7:40635. doi: 10.1038/srep40635

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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The seasonal dynamics of the CH₄ emission rate (a) and cumulative CH₄ emissions (b) from paddy soil influenced by the cultivation of Azolla. NPK, rice cropping without dual cropping of Azolla under recommended fertilization; NPK + Azolla, rice cropping with dual cropping of Azolla under recommended fertilization. The CH₄ emission rate is the mean of the values measured within each treatment (n = 3). Vertical bars denote the standard deviation of the means. Different letters above the error bars denote a significant difference between the two treatments at the same sampling time (n = 3, p < 0.05, T-test).