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Effect of diesel oil (DO) and Dactylis glomerata (Dg) on the colony development index (CD). Homogeneous groups denoted with letters (a–d) were calculated separately for each of the microorganisms. C—non-polluted and non-sown soil, Dg—non-polluted soil sown with Dactylis glomerata, DO—non-sown soil polluted with diesel oil, DgDO—soil polluted with diesel oil and sown with Dactylis glomerata.
