Alfalfa (Medicago sativa L.) is a perennial herbaceous legume widely cultivated to provide high-quality forage in the form of hay and silage. Animal husbandry should acquire a stable base of feed production support, as its further development and efficiency depend on the feed base, and the industry needs new approaches. The provision of livestock with high-protein feeds determines the need for intensive cultivation of perennial legumes, like alfalfa (Medicago sativa L.), which is a significant addition to protein in animal feeds. Perennial legumes should occupy 2–3 times the area in hectares, and crop rotation should ensure the sustainability of arable land and crop production. During field crop rotation, perennial grasses produce 0.15 to 0.6 tons of feed units per hectare and provide livestock with up to 1/4 of all feeds. Perennial legumes’ vital role is clear; in particular, alfalfa has great forage and agrotechnical importance in increasing soil fertility. In previous years, the trend has been the transition from chemical plant protection to biological measures with organic cultivation technology.

Keywords: Alfalfa (M. sativa L.), leguminous crops, forage production, high-protein feeds, biological preparations, foliar treatment, green and dry mass yield

Key findings: Exogenous application in the beginning of alfalfa (M. sativa L.) flowering with biological preparations (Organit P + Organit N + Biodux + Foliar) and external top dressing are possible to enhance the herbage density, generative stems, stress resistance, and plants’ preservation. The biological products Organica S + Foliar and foliar application boost the foliage and green and dry mass yields.