A cold-resistant soybean cultivar of the northern ecotype Sayana

The cold-resistant soybean cultivar of the northern ecotype Sayana was selected from the hybrid combination F4 L-2577 × Aldana according to the traits of cold and frost resistance and a reduced reaction for a length of a day. Additionally, the degree of cold resistance of this cultivar was evaluated by the cryo-sedimentation method. The cultivar Sayana belongs to a very early group of ripeness, which matures in 98 days at the latitude of Krasnodar (45°). In the competitive variety test in 2018-2020 its yield amounted to 1.19-2.10 t per ha. During the agroecological testing of the cultivar Sayana in Irkutsk region at a latitude of 53°, the duration of its vegetative period was 126-133 days with the average yield of 2.95 t per ha, which exceeded the standard cultivar Sibiryachka by 0.43 t per ha. The plant height of the cultivar Sayana at the latitude of Krasnodar was 77-88 cm, in the Irkutsk region at latitudes of 53°, it increased to 105-147 cm. The new soybean cultivar of the northern ecotype Sayana is highly resistant to low temperatures of air and soil during the seedling phase, and has increased productivity in long-day conditions of deficient heat supply and cold stress. This allows it to be cultivated as a main crop in the Central Chernozem, Northern Caucasian, Middle Volga, Lower Volga, Ural, West Siberian and East Siberian regions of the Russian Federation.