VARIETY STUDY OF SESAME SAMPLES IN THE CONDITIONS OF ASTRAKHAN REGION

The research was carried out in 2020–2022 in the south of Chernoyarsk district of Astrakhan region in order to identify promising and adaptive sesame breeding material to the conditions of the region for its further involvement in the creation of new varieties of this crop. The work was carried out on an irrigated plot, the soil of the experimental plot in terms of granulometric composition was heavy loamy, the soil type was light chestnut. The meteorological conditions that developed during the study period were typical for the cultivation zone. The material for the study was 70 collection samples of sesame from All-Russian Institute of Plant Genetic Resources named after N.I.Vavilov (VIR). The Solnechny variety was chosen as the standard. During the work, the following samples were identified: K-188 (Turkey), K-1060 (India), K-239 (Greece), K-1506 (Venezuela), K-594 (Tajikistan). Their yield varied over the years as follows: in 2020 – 2.2…3.1 t/ha, while the value of this indicator for the standard was 1.7 t/ha; in 2021 – 1.3…2.5 t/ha and 2.7 t/ha; in 2022 – 1.3…2.8 t/ha and 2.4 t/ha, respectively. For these samples, environmental plasticity and stability were calculated according to Eberhart and Russell. The high-intensity group (bi>1, σ2d→0) includes samples K-239 (Greece, bi=2.05 and σ2d=0.08); K-1506 (Venezuela, bi=2.18 and σ2d=0.10); K-594 (Tajikistan, bi=1.91 and σ2d=0.09). The standard indicators of environmental adaptability were as follows: bi=-2.39 and σ2d=0.09. Considering that in addition to adaptability, the samples K-1506 (Venezuela) and K-594 (Tajikistan) had an average yield of 2.0 t/ha in the conditions of Astrakhan region for 2020-2022, and the sample K-188 (Turkey) for the study period exceeded the value of this indicator for the standard by an average of 0.53 t/ha, they can be recommended as a promising breeding material for creating sesame varieties.