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. 2024 Aug 15;24:777. doi: 10.1186/s12870-024-05460-3

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 6 — Heat map analysis of onion plant growth, yield and physiological analysis as well as concentration of heavy metal Cr in soil and plants under application of Cu NPs at different concentrations in both normal and metal contaminated soils. Parameters studied were PH (plant height), electrolyte leakage (EL), MSI (membrane stability index), RWC (relative water contents), and T.M (total moisture), AsA (ascorbic acid), T. Chl. (total chlorophyll), S.Cr (Cr in soil), C.P (Crude protein), T.S (total sugars), R.Cr (Cr in root), B.Cr (Cr in bulb), L.Cr (Cr in leaves), A (ash contents), LFWT (leaf fresh weight), BFWT (bulb fresh weight), and LL (leaf length)