We investigated the effectiveness of soil liming during grass sowing and application of inoculation of perennial legume grass seeds with nitrogen-fixing and phosphate-mobilizing preparations. Methods. Field studies were conducted during 2016-2020 in the National Scientific Center "Institute of Farming of the National Academy of Agrarian Sciences of Ukraine" (northern part of the Forest-steppe of Ukraine, Chabany settlement, Kiev-Svyatoshinsky district of Kyiv region). Area of the sowing plot was 30 m2, control plot - 25 m². Repetition of experience four times. Technology of cultivation of perennial grasses and their mixtures was generally accepted. Nitrogen fertilizers in the form of ammonium nitrate containing 34% of active substance, phosphorus as simple superphosphate (18.7%) and potassium as potassium chloride (60%) were applied annually in early spring according to the experimental scheme. Liming was carried out by the lime application under pre-sowing cultivation during perennial grass sowing in a dose of 5 t/ha. Seeds of perennial legume grasses were inoculated with the strains of nodule bacteria, according to the technological instructions, immediately before the sowing. Dry weight content was determined by thermostatic weight method at 105 °C. Green mass yield was accounted by weight method, by weighing with subsequent recalculation of yield from 1 ha of dry weight. Results. The productivity of monogenic sowings of perennial leguminous grasses and their mixtures with awnless bromegrass in the variant without fertilization varied within the range of 5.12-8.38 tons, which is 1.7-2.5 times higher compared to the cereal grass stand which was formed from monogenic sowings of awnless bromegrass, for the five years on the average and for the yield from 1 ha of dry weight. The highest productivity and the level of accumulation of symbiotic nitrogen (191-266 kg/ha) were obtained in agrocenoses with alfalfa and the lowest one - with meadow clover.

Goal. Establish the best perennial legumes when grown in single-species and compatible fodder agrocenoses with stokolos boneless and the effectiveness of the use of nitrogen-fixing and phosphorus-mobilizing bacterial preparations, as well as liming. Methods. General scientific − hypotheses, inductions and deductions, analogies, generalizations and special − field, laboratory, mathematical and statistical, computational and comparative. Results. Based on the generalization of literature sources, it is proved that the creation of sown grasslands, with high content of perennial legumes on meadows and arable lands, which are derived from intensive cultivation is one of the most promising areas of organic onion growing. Productivity of single-species crops of perennial legumes and their mixtures with boneless stalk on average for five years after the yield of 1 ha of dry mass in the version without fertilizers ranged from 5.12 to 8.38 tons, which is 1.7−2.5 times more in comparison with a grassy grass stand which is formed from one-species crops of a stokolos of a boneless. The highest productivity and level of symbiotic nitrogen accumulation (191−266 kg / ha) were provided by agrocenoses with the participation of alfalfa, and the lowest - meadow clover. The efficiency of soil liming during sowing of grasses and application of inoculation of seeds of perennial legumes with nitrogen-fixing and phosphorus-mobilizing preparations is given. Changes in the chemical composition of feed under the influence of the studied factors are also shown. Conclusions. Different types of perennial legumes and their mixtures with boneless stalk without fertilizers provide productivity in the range of 5.12−8.38 t / ha of dry weight, which is 1.7−2.5 times more than the grass cover, which is formed from single-species sowing of stokolos bezzostoy. Inoculation of perennial legume seeds with nitrogen-fixing and phosphorus-releasing microbiological preparations increases the productivity of perennial legumes and their mixtures with cereals by 2−6%, and soil liming before sowing – by 3−11%. The greatest effect is provided by the combined use of these bacterial drugs. Alfalfa sowing responds best to their use and liming.

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