EN
This study investigated the effect of plants inoculation with Azospirillum spp. and Pseudomonas stutzeri in soils freshly contaminated with PAH's on number of microorganisms. During the 30-days experiment a relatively higher number of bacteria, actinomycetes, ammonifying and proteolitic bacteria and microorganisms able to use PAH's and disel fuel as a only source of carbon and energy were detected in chernozem and rendzina after grown of maize and meadow feascue inoculated with Azospirillum spp. and Pseudomonas stutzeri. Statistically important decrease number of microorganisms (except for fungi) in soil after grown of plants non- inoculated and inoculated were confirmed after pollution of soils with diesel fuel at 1% dose.