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Evaluation of ecological stability of common hop varieties

The results of the research into the yield of common hop varieties (Humulus lupulus L.) in the conditions of the southern part of VolgaVyatka region are presented. The study of adaptive potential and yield variation coefficient (V) was carried out on 250 hop samples from various regions of Russia and 17 foreign countries. The experiment was carried out in three layouts in 1989, 2004, 2018 (third year of life) and in 1990, 2005, 2019 (fourth year of life) in a collection nursery in Chuvash Republic. The plantations of the hop variety collection were located on the dark-grey forest heavy loamy soil with an average level of fertility. The soil of the nursery was weakly acidic, the feeding area was 2.5 × 1.2 m. The collection of hop varieties consists only of female plants and is kept in the live form. Weather conditions in the vegetation season of the growth and development of hop plants during the research period varied from year to year. The most favorable meteorological data for crop cultivation was recorded in 2019. The hop cultivation technology recommended in the region was used in the collection nursery. The study of varieties by ripeness groups was carried out as compared with the standard variety Podvyazny (Russia). Among the hop samples studied in three layouts, it was found that the mid-ripening variety Kruglyak-Seryak (Ukraine) (1.76) has the maximum adaptability, and Serebryanka Kalistovskaya (Russia) in the fourth year of life (V = 1.70%) has the best stability. These samples are recommended for breeding of environmentally sustainable varieties of hops.