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This study was carried out based on a randomized complete block design with three replications in Ilam (Iran) under greenhouse conditions in 2019. This design includes biological fertilizer factor at two levels of inoculation and non-inoculation, mycorrhiza fungus at two levels of consumption and non-consumption, and fertilizer at four levels that include control treatment, EDTA chelate, urban compost and biochar application on the absorption of heavy metals, phytoremediation power and corn yield. In this study, the concentration of zinc, cadmium, Cadmium, nickel and chromium in the root as well as grain yield, TF indicator (transfer factor), BCF (biological aggregation factor), and BAC (biological aggregation coefficient) were measured. The data were analyzed with SAS software using Duncan's multiple range test. The highest transfer factor and BAC value were 1.82 and 1.59 respectively in the biochar treatment, mycorrhiza treatment, and bacterial inoculation, but there was no significant difference with the use of EDTA chelating agent or urban compost consumption. Furthermore, the lowest value of transfer factor and BAC were 0.59 and 0.76 respectively in the treatment of non-consumption of fertilizer levels. At different levels of control treatment (including bacterial inoculation or non-bacterial inoculation and consumption or non-consumption of mycorrhizae), BAC in the root was always lower than different levels of biochar consumption, EDTA chelating agent, and urban compost. The maximum BCF was obtained in the control treatment, compost consumption and non-bacterial inoculation at 1.2. In general, non-consuming any type of fertilizer increased this index. Moreover, the highest colonization was obtained in the biochar treatment, consumption of mycorrhiza, and bacterial inoculation at 39.7%. In this study, it was found that separate use of urban compost, especially biochar and EDTA chelating agent, as well as combination of these fertilizers with mycorrhizae and bacteria have increased the absorption of heavy elements in the roots and improved the potential of corn for phytoremediation.
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