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. 2020 Apr 14;10:6415. doi: 10.1038/s41598-020-63548-w

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© The Author(s) 2020

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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Nitrogen content in the roots and leaves of the clonal ramets of Kentucky bluegrass as affected by drought stress under three nitrogen isotopes at low, moderate and high rates. (a) ¹⁵NH₄Cl at 1.5 mM, (b) K¹⁵NO₃ at 1.5 mM, (c) ¹⁵NH₄Cl at 15 mM, (d) K¹⁵NO₃ at 15 mM, (e) ¹⁵NH₄Cl at 30 mM, and (f) K¹⁵NO₃ at 30 mM.