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. 2018 Mar 29;8:5389. doi: 10.1038/s41598-018-23677-9

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© The Author(s) 2018

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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Exogenous gibberellin (GA₄) application and Premium biochar (BC) amendment interact synergistically to increase the shoot biomass and length of M82 tomato plants. Least Square (LS) Mean interaction plots for each species show relationship between GA₄ application and BC amendment for (a–d) shoot fresh weight and (e,f) shoot length. The experiment was repeated in four trials, and trial was included as a random factor in the model. Shoot weight and length values were square root transformed to meet homogeneity of variance and normality assumptions. Values represented in the figure are not transformed. P values represent significance of BC × GA₄ interaction in the full model analysis. The interaction effect was considered statistically different at p < 0.05. Error bars represent one standard error. Abbreviations: H7996 – Solanum lycopersicum cv. Hawaii7996. M82 – S. lycopersicum cv. M82. WV – S. pimpinellifolium accession West Virginia700. SP – S. pennellii accession LA0716. Full model results are in Table S1.