REGIONAL MEADOW FARMING BASED ON BROAD-LEAVED ARCTOPOLICA OF THE PRIOKHOTSKAYA VARIETY

The article deals with the topical issue of the formation of the local livestock feed base and the preservation of the productive longevity of sown meadows, based on the variety of broad-leaved arktopolitsa Priokhotskaya (Arctagrostis latifolia), created in 2012 in the Magadan Research Institute of Agriculture (R.Br .) Griseb). The purpose of the research is to create a regional system of seed production of perennial grasses to reduce the volume of the market of imported seeds and the formation of an economically valuable crop of fodder grasses at the expense of their own. The results of research conducted by the Institute's staff for a number of years (from 2012 to the present) give an idea of the full characteristics of the variety, revealing the full potential for plant growth and development, changes in the biochemical composition of feed during the growing season, depending on the phases of development. In extreme soil and climatic conditions of agricultural lands of the Magadan region, located mainly on permafrost tundra soils, the variety has the maximum adaptation over the years to abiotic and biotic factors, which determines the effectiveness of its use in regional meadow farming. A tendency to increase the protein and fat content in the earing phase and a gradual decrease in these indicators in later phases of development due to increased nutrient intake by the plant due to a sharp increase in aboveground mass has been established. The content of fiber, ash and calcium in plant tissues increases gradually and reaches a maximum by the time of maturation. A change in the biochemical composition and a stable reaction to meteorological conditions regulating the duration of phenological phases indicates the unique properties of the development of the variety and its adaptive capabilities in the conditions of the Northeast.