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. 2019 Mar 19;19:107. doi: 10.1186/s12870-019-1710-5

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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. 3 — Effect of drought and/or DCPTA treatment on root length density (RLD) (a, b) and root surface area density (RSD) (c, d) for different soil depths on the 20th day and 30th day after treatment in 2016 and 2017