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. 2017 Apr 14;13:26. doi: 10.1186/s13007-017-0174-6

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Correlation of the chlorophyll content estimated by RGB value and chemical extraction. a, b Comparison of extracted chlorophyll calculated by the Lichthenther (a) and Arnon (b) methods to chlorophyll content estimated by RGB value of Arabidopsis seedlings grown in agar plates under different C/N treatment (n = 234, four independent experiment). c, d Chlorophyll content estimated by RGB value and chemical extraction in soil-grown-plant using the defaulted coefficients (c) versus the refitted coefficients (d), respectively (n = 15)