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. 2018 Dec 18;26(5):4746–4763. doi: 10.1007/s11356-018-3923-9

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© The Author(s) 2018

Open Access This 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.

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Fig. 3 — Relative chlorophyll a fluorescence induction curve. Values are means ± SE. (n = 16). G, soil from Gliwice site (HM_low); B, soil from Bytom site (HM_mod); P, soil from Piekary Śląskie site (HM_high); NS, nonsterilized soil; S, sterilized soil; 0, minimal fluorescence intensity (F_O); K, band at 0.0003 s; J, band at 0.002 s; I, band at 0.002 s; P, maximal fluorescence intensity (F_M)