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. 2016 Aug 31;27(2):83–94. doi: 10.1007/s00572-016-0729-9

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© The Author(s) 2016

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 — Photosynthetic performance index (PI_ABS; mean ± SD) of Rudbeckia laciniata and Solidago gigantea grown in the fallow and river valley soils. Within each plant species, the asterisks (*) indicates the significant main effect of the soil (P < 0.05) (see Table 2 for details)