Promising soybean breeding lines of the northern ecotype for developing forage crops

Abstract

The article presents the results of comparative assessment of soybean breeding lines of the northern ecotype for selection of the most promising ones for developing forage varieties suited for cultivation in mixed crops. The studies were carried out in 2018-2021 in the conditions of the Chuvash Republic on gray forest heavy loamy soil. The experiment included four soybean lines in comparison with the SibNIIK 315 standard recommended for growing in the Volga-Vyatka region. The crops were evaluated according to the dynamics of accumulation of aboveground biomass during the phases of formation and filling of beans. Based on the results of a 4-year observation period, correlations between the productivity of soybean lines of the northern ecotype with weather factors have been established. It has been revealed that the yield of aboveground mass during the phases of formation and filling of beans depended mostly on atmospheric precipitation (r = -0.49…-0.86). It has been established, that breeding lines No. 314 and No. 320 of middle early and mid-season ripening period had rather high productivity. The yield of green mass in single-crop sowings was 39.7 t/hа in line No. 314 and 36.7 t/hа in line No. 320 that 1.5 times exceeded the standard variety. The selected lines are worth noting and according to bush architectonics are rather high (90- 91 cm), foliate (46-44 %), branched, nutate plants.