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The purpose of the research was to study the features of the influence of microbiological preparations based on associative nitrogen-fixing bacteria on the enzymatic activity of the rhizosphere and the elements of spring barley productivity. The research was carried out as part of a vegetation experiment. Soil samples were taken in three terms, which corresponded to the phases: tillering, budding and heading. In the experiment, microbiological preparations flavobacterin (Flavobacterium sp. strain 30) were considered; mizorin (Arthrobacter mysorens, strain 7), rhizoagrin. (Agrobacterium radiobacter strain 204). Enzymes belonging to the classes of oxidoreductases (catalase, peroxidase, and polyphenol oxidase) and hydrolases (urease, phosphatase, and invertase) have been studied. The enzymatic activity of the barley rhizosphere was evaluated against the background of the application of mineral fertilizers in combination with microbiological preparations and without them. During the experiment, it was noted that the activity of the studied enzymes depended on the phase of plant development and the type of microbial preparation. The most significant increases in ear productivity elements were found with the combined use of mineral fertilizers and microbiological preparations. But even without a mineral background, inoculation with microbiological preparations gives a significant increase compared to the control variant. [ABSTRACT FROM AUTHOR]