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. 2019 Dec 9;15:148. doi: 10.1186/s13007-019-0533-6

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© The Author(s) 2019

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. 5 — The correlations of deep root intensity and ¹⁵N enrichment in barley grain. The correlations were conducted on seven genotypes of barley at 0.87–1.30 m (a) and 1.30–1.74 m (b) soil depths in Exp. 3