Main parameters of adaptability of introduced early age grape varieties

This article presents the results of studying main parameters of adaptability of introduced seedless grape varieties. The experience was laid down in the spring of 2020 according to the method of M.A. Lazarevsky on the territory of the vineyard of the Federal State Budgetary Scientific Institution “Precaspian Agrarian Federal Scientific Center of the Russian Academy of Sciences”. The landing pattern is 4.0 ? 2.0 m. The object of research was 16 seedless grape varieties of various breeding. The zoned Luchisty variety was a control. The conducted studies showed that the degree of maturation of shoots over three years of study was maximum in 2022, when the sum of active air temperatures above 10 °C during the growing season was 3679.3 ° C – from 90,6 % in the Neptune variety to 99.9 % in the Stoletie variety. The maximum leaf plate was in 2022 in the varieties Jupiter and Veles (99.8 cm2), Lucia (98.7 cm2), Neptune (89.9 cm2), Stoletie (86.7 cm2). Varieties Veles, Lucia, Stoletie were characterized by the highest values of leaf area per hectare – up to 1187.5 m2/ha. The maximum leaf surface index (leaf area per 1 m2 of soil surface) had Lucia and Veles varieties – 0,08 and 0.09 m2/m2, respectively. The standard variety Luchisty also had a fairly high level of leaf surface – 0.06 m2/m2.