EN
In soil incubation experiments, some fungicides were found to be toxic to the nearly total fungal community, whereas others did not diminish its size. The reduction of fungi occurence always resulted in proliferation of copiotrophic typical bacteria with selection of fluorescent Pseudomonas. On the other hand, actinomycetes never responded positively to fungicides. Those effects were accompanied by a reduction of soil bacteria community as a whole. The increase instead of that reduction occured in the case when no reaction of fungi (and therefore copiotrophic bacteria) was noted. The reasons of such differentiated response of microorganisms are also discussed in this paper.