Winter rye varieties yield under different agroecological Krasnoyarsk region conditions

Research was carried out to evaluate six varieties of winter rye (Yeniseyka, Krasnoyarskaya universalnaya, Sibirskaya 87, Narymchanka, Tetra korotkaya, Vlada) in terms of yield and environmental sustainability parameters. The results of variety trials for 2017–2019 were studied in three natural and climatic zones of the Krasnoyarsk Region: subtaiga of the lowland, typical forest-steppe and southern forest-steppe. The average yield of the varieties, the coefficient of variation, the degree of stress resistance, the compensatory capacity of the variety, and the range of yield were determined. The highest yield (on aver-age for the years of research 4.78 t/ha) and less variability of this trait over the years (coefficient of variation 8.4–23.2 %) varieties of winter rye were characterized in the zone of typical forest-steppe. In the southern forest-steppe zone, the average yield was 3.42 t/ha, the coefficient of variation, depending on the variety, ranged from 29.8 to 52.9 %. In the lowland subtaiga zone, the average yield was 1.98 t/y, the coefficient of variation was 9.5–56.1 %. In terms of the sum of ranks under the conditions of the subtaiga and typical forest-steppe, the Krasnoyarskaya Universalnaya variety was the best, in the southern forest-steppe – Sibirskaya 87. According to the results of the assessment in 9 environments, a significant variability in the yield of winter rye varieties was revealed, which indicates the need for their breeding improvement in this direction. The range of yield ranged from 69.5 to 83.2 %, stress resistance from -3.19 to -5.20, the coefficient of variation from 37.1 to 54.5 %. The varieties with the highest yield potential (Narymchanka, Vlada) were characterized by the lowest environmental sustainability. Sibirskaya 87 was the best in terms of stress resistance and yield range, Yeniseyka in terms of variability, and Krasnoyarskaya Universalna in terms of a set of characteristics. The revealed intervarietal differences indicate the prospects of breeding work on the creation of winter rye varieties capable of forming a consistently high yield in various environmental conditions of the Krasnoyarsk Region.