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. 2016 Aug 5;6:30350. doi: 10.1038/srep30350

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Copyright © 2016, 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 carbon input (t ha⁻¹ yr⁻¹), change in SOC storage (ΔSOC, t ha⁻¹ yr⁻¹) and carbon sequestration efficiency (CSE) from the initial year to 2012 under CK, NPK and NPKM treatments at six fertilization experimental sites in China (panels a~i). The inset in each panel denotes the average carbon input, ΔSOC or CSE during 1979 to 1995 and during 1996 to 2012 at each specific site displayed in a descending order from top to bottom.