Plasticity and stability of oil flax varieties in the central region of the Non-Chernozem area

The article presents the results of testing of five oil flax varieties in the central region of the NonChernozem area. From 2022 to 2024, the varieties VNIIMK 620 FN, Y 117, Rucheyok, RFN, and LM98 were studied at the Moscow Timiryazev Agricultural Academy's field experimental station. Meteorological indicators varied greatly over the threeyear period. 2022 was the least favorable year for oil flax cultivation, and 2024 was the most optimal. The plasticity, stability, and intensity of the varieties were calculated using the methods of Eberhart S.A. and Rassell W.A., as edited by V.A. Zykin and R.A. Udachin. The variety VNIIMK 620 FN showed the highest yield in 2022 and 2023 (1.7 and 2.2 t/ha, respectively). In 2024, the variety Rucheyok had the highest yield (3.0 t/ha). Among all the varieties, the VNIIMK 620 FN had the lowest yield range (3.8). The variety Rucheyok showed the highest linear regression coefficient (bi) for yield (1.45). The released variety Y 117 had the highest yield stability. On average, the oil content of the presented varieties was 43.1% over the years of testing. Over the three years of testing, no variety exceeded the standard variety Y 117 in oil content. Rucheyok was the most stable variety in terms of oil content, with a range (d) of 3.2. VNIIMK 620 FN can be classified as an intensive variety in terms of oil content (bi = 1.80) due to its plasticity indicator (bi). Y 117 and Rucheyok were the most stable varieties in terms of the σd² coefficient, with stability values of 0.00 and 0.01, respectively.