FORMATION OF VEGETATIVE PRODUCTIVITY OF SELECTION SAMPLES OF VARIEGATED ALFALFA
Research objective: to study the vegetative productivity of breeding samples of variegated alfalfa. Experimental studies were conducted in the Northern Trans-Ural State Agricultural University, in the forest-steppe of the Tyumen region (2015-2019). The article presents the results of studying 11 samples of variegated alfalfa, created by the method of polycross with subsequent biotypic selection. The Bystraya variety recommended for cultivation in production was adopted as the standard. One of the reasons limiting the expansion of alfalfa acreage in the Northern Trans-Urals is the lack of varieties with high productivity of green mass and seeds, and adapted to specific natural and climatic conditions of cultivation. From this point of view, it is important to conduct research in breeding populations. On average, over the years of study, breeding samples of variable alfalfa formed a high vegetative productivity. The yield of green and dry mass of alfalfa depended on the meteorological conditions of the growing season in the years of research, mowing and genotype. Samples that combine high productivity indicators in the first and second mowing are of practical value. Among the studied samples of alfalfa, KP-35 and KP-33 should be singled out, which for two mowing formed the yield of green mass of 30.2-32.4 t/ha, and the standard Bystraya variety - 29.1 t/ha. The yield of dry mass was directly related to the yield of green mass. According to the complex of characteristics, among the studied alfalfa samples, KP-35, KP-33, and KP-36 samples were selected. the Best samples can serve as genetic sources for creating new varieties with increased vegetative productivity and overcoming vulnerability to stress factors.