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. 2018 Feb 1;8:2136. doi: 10.1038/s41598-018-20124-7

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© The Author(s) 2018

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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Neutron tomography image of 3 year-old roots in 6 cm diameter soil in aluminum (Al) pots embedded in Geumsan/Jinan root field for diagnosing pathology and measuring qualitative water content. (a) Histogram of water content in root. x axis: attenuation value, y axis: count (voxel number): Histogram of high water content (72%) in root, histogram of middle water content (58%) in root, and histogram of low water content (37%) in root. (Camera: Roper Scientific 1340 × 1300, and scintillator: 50 μm). (b) Neutron tomography image on Gumesan field 3-year-old root showing root volume (cm³), qualitative water content, and histogram (x axis: attenuation value, y axis: count = voxel number): Al pots, No. 16, No. 18, and No. 20 (Camera: Roper Scientific 1340 × 1300, and scintillator: 150 μm).