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. 2017 Sep 12;7:11391. doi: 10.1038/s41598-017-11681-4

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Relationships between concentrations of K in shoots and relative dry matter for wheat grown in 9 contrasting soil types (open symbol represent the values obtained from small pots and closed symbols represent the values obtained from large pots). The final figure is a combined analysis across all 9 soil types, with the dashed and continuous lines representing the relationship curve for small pots and large pots, respectively. R² in the large pots rises from 0.28 to R² = 0.63 when soils NK and WN were excluded from the results.