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. 2019 Oct 7;9:14403. doi: 10.1038/s41598-019-50730-y

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© The Author(s) 2019

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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Distribution in classes of mineral weathering effectiveness of the bacteria depending on the treatment (control, K fertilized and Mg fertilized) and on the sampling time (T0, T1 and T3). (A) Iron mobilizing ability and (B) Inorganic phosphorus solubilizing ability. For each bioassay, determination of the class of effectiveness was done depending on the median (M) of the discoloration zones of the positive strains (black: strong activity, discoloration zone > M; grey: moderate activity, discoloration zone < M; white: no degradation activity). Capital letters (A,B or C) indicate significant differences between the sampling times, within one treatment. Lowercase letters (a,b of c) indicate significant differences between the treatments, within one sampling time. Statistics were obtained according to a Chi2 test (P < 0.05). A total of 412 and 357 bacterial strains have been tested on the TCP and CAS media, respectively. Each strain was tested with 3 replicates.