Actuality. The effect of different types and doses of fertilizers in combination with microbial preparation Polymixobakteryn and stand-alone on nitrogen fixation and biological denitrification in rhozosphere soil of corn was studied in long-term stationary field experiments. The conducted research have indicated that the most ecologically expedient doses of fertilizers were the ones that do not exceed N 90 P 90 K 90. It was shown that fertilizer efficiency was higher in the variants with

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... al preparation Polymixobakteryn. Economically and environmentally attractive use of manure was also confirmed in corn growing technologies. Due to the high level of N 2 O emissions accompanying manure application the receipit and use of compost from manure is required. Application of manure and biocomposts offsets the pre-sowing seeds bacterization efficiency and should be taken into the account when planning crop fertilization systems.