Research aimed at the accumulation and effective use of nitrogen, its symbiotic fixation from the air by white lupine plants, by selecting the best cereal components, optimizing their ratio and methods of placement when growing in compatible crops under different fertilization systems in the Forest Steppe is insufficient. The purpose of this study was to establish the best cereal components, their ratio and methods of placement with white lupine when sowing in joint crops under different fertilizer systems to produce grass fodder in the Forest-Steppe of Ukraine. The following methods were used: field, laboratory, mathematical-statistical, calculation-comparative. It was established that the highest productivity on the background without fertilizers (4.21-4.86 t∙ha–1 of dry matter) was provided by single-species crops of maize and white lupine, as well as their combined crops, which were formed by continuous row and strip methods, which by 2.60-3.17 t∙ha–1 of dry matter or 1.8-2.6 times more compared to crops of oats and its mixture with white lupine and by 1.13-1.58 t·ha-1 or 1.4-1.5 times more compared to crops of Sudanese sorghum and its mixture with white lupine. Through the accumulation and use of symbiotic nitrogen fixation, the productivity of lupine-oat mixtures increased from 1.90 to 2.70-3.21 t∙ha–1 of dry mass or 1.4-1.7 times, and that of lupine-sorghum – from 3.17 to 3.43-3.47 or 1.1 times. The most effective ratio of each cereal component to legume in binary intercropping was 25:75% of the sowing rate in single-species agrocenoses when dry biomass productivity was the greatest. Compared to the variant without fertilizers, the most significant (by 1.3-2.0 times) increase in the productivity of all fodder agrocenoses under study was ensured by the application of N45Р30K50, while the application of P30K50 or humigran organic fertilizer at a dose of 250 kg·ha–1 – only by 1.2-1.3 times. The research results can be used in the development of scientific and methodological recommendations and the education about the formation of highly productive agrophytocenoses for conveyor production of high-quality grass fodder for animal feeding

The relevance of the research lies in the need to involve in the feed production of grass species containing biologically active substances for use as natural animal growth stimulants. The purpose of the study was to experimentally establish the economic and biological value of medicinal and fodder grass species, their technological suitability for growing in clean crops, obtaining raw materials and forming phyto-mixtures from them for use as organic feed additives. In the course of conducting research, the following methods were used: field, laboratory, analytical, and statistical. The economic and biological value for the growth of the following types of medicinal herbs in the feed production was determined: hyssop, fennel, white horehound, Moldavian dragonhead, coriander, yarrow, purple coneflower, dandelion, milk thistle, anise hyssop, St. John’s wort, sneezeweed, sweet wormwood. It was established that annuals in the year of sowing, and perennial species in the second or fourth years of use provided a dry mass of grasses – 1.7-5.0 t/ha and seeds – 0.3-1.8 t/ha. These types of herbs contain biologically active substances (polysaccharides, essential oils, flavonoids, organic acids, mainly vitamins, and trace elements) that have a positive effect on the animal body. The technological suitability for harvesting raw materials and forming phyto-mixtures of the following species is also proved: milk thistle, Moldavian dragonhead, coriander, hyssop, fennel, purple coneflower, anise hyssop, white horehound, and yarrow. As a result of the research, a database was created on the selection of medicinal herbs, their technological suitability for cultivation, and optimal harvesting times for harvesting raw materials with subsequent use in feed production. The inclusion of medicinal and feed species in feeding rations can ensure the production of organic livestock products that meet the requirements of the European Green Deal strategy

The relevance of the results of these studies lies in the fact that until recently, changes in the mineral composition of different types of meadow agrophytocenoses under the influence of symbiotic alfalfa and mineral nitrogen in the content of macro- and microelements, heavy metals, and nitrates in feed biomass have not yet been sufficiently investigated, which hinders the development and implementation of feed production findings in agricultural production. The purpose of the study is to establish changes in the accumulation of various meadow agrophytocenoses in dry feed biomass on various agricultural zones of mineral elements during cultivation on dark grey soils of the Right-Bank Forest-Steppe. During this study, field and laboratory methods were used, and an analytical method was used to determine the mineral composition of dry feed biomass. The results of studies on the accumulation of alfalfa, alfalfa-cereals, and cereal stands in in dry feed mass on various backgrounds of fertilisation and liming of raw ash, macro- and microelements, heavy metals, and nitrate nitrogen are presented. It is shown that under the action of symbiotic nitrogen in alfalfa and alfalfa cereal stands, compared with cereals in the dry mass of feed, raw ash accumulates more macroelements, trace elements, and heavy metals by 0.6-0.8%, the ratio of calcium to phosphorus increases by 0.11-0.26, and potassium to the sum of calcium and magnesium decreases by 0.11-0.26. Under the action of mineral nitrogen in the case of the introduction of N90 in the cereal stand, the content of nitrates increases from 0.02 to 0.04%, zinc – from 9.1-9.2 to 12.4-12.6 or by 3.2-3.5 mg/kg, copper – from 3.4-3.7 to 5.3-5.5 mg/kg, as well as manganese, lead, nickel, cadmium in the dry mass of the feed of the cereal stand. It is proved that the content of macro- and microelements in the dry mass of feed corresponds to zootechnical standards for feeding cattle, and nitrates and heavy metals do not exceed the maximum permissible concentrations. The results of these studies can be used in the development of recommendations on technologies for growing perennial cereals for feed purposes and in the educational process