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Saabunud / Received 02.05.2022 ; Aktsepteeritud / Accepted 14.07.2022 ; Avaldatud veebis / Published online 14.07.2022 ; Vastutav autor / Corresponding author: Yevheniia Butenko ; evg.butenko2011@ukr.net The efficiency of growing leguminous and cereal agrophytocenoses (Trifolium pratense and Medicago sativa sown with the addition of Bromus inermis, Lolium multiflorum, Festuca rubra), highlighted their economic and energy advantages over cereal grasses. The article presents the results of the study of the influence of grass mixtures on the main indicators of the efficiency of growing sowing phytocenoses during haymaking in the Carpathians on dark grey soil. Growing agrophytocenoses without mineral fertilizers ensures the maintenance of 370–520 € ha–1 of net profit, with the profitability of 151–187%, the cost of 1 ton of feed units – 56.7–66.7 €, bioenergy coefficient – 2.5–2.9, energy efficiency ratio – 5.8–6.5 and energy consumption per 1 ton of feed units – 4.0–4.7 GJ. The cultivation of alfalfa-cereal grasses is ensured on dark-wet soil with three years of use of the best indicators of economic and energy efficiency. It was found that on both experimental bean–cereal grasses the highest efficiency is maintained when P60K60 is applied in combination with inoculation of seeds of bean strains of nodule bacteria.

Saabunud / Received 15.12.2021 ; Aktsepteeritud / Accepted 18.06.2022 ; Avaldatud veebis / Published online 18.06.2022 ; Vastutav autor / Corresponding author: Andrii Butenko ; andb201727@ukr.net The analysis of efficiency’s research of interrelation between soil’s biomass and tillage systems and fertilizers is done. The number of microorganisms responsible for the transformation of nitrogen compounds and their state in typical black soil was studied. There is evidence-based scientific and practical research on the effectiveness of these microbiological processes and the improvement of environmental performance through the various fertilizer systems and soil tillage. The use of an organic-mineral fertilizer system increases the total number of soil microorganisms and exponential mobilization processes, compared to the variant without fertilizers. This pattern is clear in the variants of shelf tillage for row crop rotation. The number of microorganisms that absorb mineral compounds of nitrogen decreased by 24%, bacteria ammonification by 1.5–5.7% compared to plough tillage. The ratio between the number of microorganisms accounted for the nutrient laboratory solutions for organic-mineral fertilizer system, compared to variants without fertilizers, is greater by 20–26% for differentiated and 14–35% for shallow tillage.