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. 2021 Apr 9;66(4):597–606. doi: 10.1007/s12223-021-00866-0

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© The Author(s) 2021

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Fig. 2 — Principal coordinates analysis (PCoA) plot using Bray–Curtis distance. PS: preservation solution (LifeGuard®). Soils were contaminated with crude oil and then biotreated at four conditions: only fertilizer no-till, rhamnolipid 0.5 g/kg and fertilizer, 5% w/w kenaf and fertilizer, and soil only (control)