Assessment of the ecological plasticity of cocksfoot specimens in the Komi Republic

Relevance. Analyzing the modern requirements of agricultural producers of livestock products for varieties of perennial forage crops, we can identify a number of their main criteria. These are economically valuable traits (high yield, quality indicators, disease resistance), and the length of years spent in grass, and most importantly, high adaptability to the biotic and abiotic environmental factors in which this crop is cultivated. Methods. In the study, which included two stages, an analysis was carried out in a collection nursery of eleven cocksfoot ( Dactylis glomerata L.) samples from the N.I. Vavilov All-Russian Institute of Plant Genetic Resources (VIR) (St. Petersburg) of various ecological and geographical origins, geographically related to the northern, arctic region of the Russian Federation (2016–2018) and four numbers of the breeding nursery selected for further testing (2020–2022) according to environmental parameters plasticity, stability and adaptability. Results. Based on the results of research in 2016–2018 of a promising forage cocksfoot crop, it was established that the most valuable breeding material for further hybridization are the varieties Dvina (Russia) and Haka (Finland), which showed a high average yield of two cuttings of green mass – 20.0–20.5 t/ha. Of the cultivars under consideration in 2020–2022, CH-185 (bi – 0.94, σd2 – 0.93) was classified as the most plastic and stable; sample CH-188 (Xsr. – 42.9 t/ha) exceeded the standard Neva (Russia) variety in terms of dry weight yield for two mowing by 2.1 t/ha, and in terms of yield seeds – 40.5 g/m 2 .