ASSESSMENT OF INDICATORS OF ECOLOGICAL PLASTICITY AND STABILITY OF PROMISING SPRING OAT LINES BASED ON THE «1,000 GRAIN WEIGHT» IN THE KIROV REGION

The research was conducted in order to compare the ecological plasticity and stability of spring oat varieties according to the «1,000 grain weigt» indicator in order to identify those that are adaptive to the conditions of the Volga--Vyatka region. The experiments were conducted in 2022-2024 in the Kirov region with 8 varieties of spring film oats in a competitive variety testing with four repetitions. The soil at the site was cultivated sod-podzol medium loam. In 2022, there was excessive moisture (GTK = 2.00), in 2023 optimal conditions were created for plant growth and development (GTK = 1.64), and in 2024 there was a lack of moisture (GTK = 1.10). The indicators of ecological adaptability were calculated using methods developed by S.A.Eberhart, B.A.Russell (bi, σd²), R.A.Udachin (I, U), A.A.Gryaznov (IEP), and E.D.Nettevich et al. (PUSS, L). According to the results of the two-factor analysis of variance, the weight of 1,000 grains was significantly affected by weather conditions (58.9 %) and genotype × environmental interactions (28.1 %). The genotype of the studied lines had a slight effect (13.0 %). Favorable conditions for the formation of a high mass of 1,000 grains developed in 2024, with an index of environmental conditions of 1.77 and a maximum experimental value of 47.1 grams at the 41h18 line. The studied lines were classified as slightly variable based on the coefficient of variation for the mass of 1000 grains (CV < 10 %). However, the 40h20 and 41h18 lines had higher coefficients of variation (CV = 12.74 % and CV = 10.46 %, respectively). The 40h20 line ranked first in terms of three indicators of ecological adaptability (bi = 2.06, I = 26.4 %, IEP = 1.04). However, in terms of stability indicators, it did not perform well (Y = 48.5, L = 3.35, PUSS = 143.3). Therefore, the 91h18 line, which is the sum of 22 rankings, had the highest level of adaptability to the conditions of the Kirov region when considering the «mass of 1,000 grains» indicator.