Contamination of soils artificially polluted with PAHs and aged polluted with crude oil in the phytoremediation process were compared. The plant used in the tests was maize (Zea mays L.). In chamber tests with soils artificially polluted (chernozem, calcareous rendzina, and lessives), selected three PAHs (anthracene, phenanthrene, and pyrene) were used at the doses of 100, 500, and 1000 mg·kg^-1 d.m. of soil and diesel fuel at the doses of 0.1%, 0.5%, and 1% (v/v). Brown soil from crude oil refinery was chosen as the soil naturally, aged polluted with crude oil. Additionally, plant inoculation with the mixture of bacteria strains Azospirillum and Pseudomonas stutzeri was applied in the bioremediation process in the amount of 1 ml·500 g^-1 of soil. Chamber pot-tests were carried out in controlled conditions (temperature, humidity) during a four-week-long plant growth period. Physical properties of soils and the dry mass of above- and underground parts of plants were analyzed in the work. The obtained results showed a statistically significant increase in the dry mass of the above- and underground parts of plants (both artificially and aged polluted) inoculated with Azospirillum and Pseudomonas stutzeri after maize growth.

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