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Effect of diesel oil (DO) and Dactylis glomerata (Dg) on the ecophysiological diversity index (EP) of the microorganisms. Homogeneous groups denoted with letters (a–c) 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.
