Plasticity numbers of certain barley cultivars in the Vologda region

The studies, which were conducted on sod-podzolic medium loamy soil, on average for 2018-2019 in the conditions of the Vologda region, revealed that various barley cultivars provided grain yield of 3.60- 2.72 t / ha. To calculate the plasticity and stability, we used the technique developed by Eberhart and Russell in the modification of V.A. Zykina and others. Differences in yield over the years reached 0.69 t / ha, and between barley cultivars in 2018 - 1.44 t / ha, and on average for 2 years of research on the studied barley cultivars differences in yield reached 0.88 t / ha. The studied barley cultivars, with the exception of the earliest ripening, Leningradsky, provided positive values for the variation in plasticity, that is, all varieties (except for Leningradsky) increased productivity with improved growing conditions. For the Leningradskiy variety, this coefficient was close to minus one, it was a negative value (-0.75). At the same time, the reaction of the studied varieties was ambiguous. The varieties Izumrud and Zazersky 85 are characterized by the highest responsiveness, the coefficient of which corresponded to 4.35 and 4.14. Such varieties as Nur, Moskovsky 86, Kotlassky, Zlatoyar provided above average responsiveness, the coefficient bi for varieties was 2.35, 1.90, 1.82 and 1.62, respectively. Variance stability varied in the cultivars from 0.03 to 0.05, i.e. to 0. Moreover, the Leningradsky variety (0.03) provided the highest stability. The stability of all studied barley cultivars in the Vologda region was high, respectively, in percentage, at the level of 97-95.