Studies were conducted in 2020–2022 at the Federal Research Center "Nemchinovka" to identify the peculiarities of accumulation depending on hydrothermal conditions of the growing season of extractive substances in the grain of spring barley varieties of different intended use. At the same time, the possibility to improve their nutritional or forage properties by increasing the nitrogen nutrition background was found out. Three-factor field experiments were conducted by the split plot method, the repetition was double, and the plot area was 12 m2. It was established that the decisive influence on the formation of the extractivity index had the factor "year" – 50,16 %, and the reliability of the influence of interaction between the factors indicated the possibility of increasing it through the rational use of nitrogen fertilizer and the use of adaptive varieties. In 2020, favorable in terms of moisture, against the background of nitrogen nutrition, grain was formed with the same high average extractivity value (80.6 %). Under dry conditions (2021–2022) there was a decrease in the average values of the indicators to 77.8–79.6 % and a decrease in the level of extractive substances in the grain after additional nitrogen fertilization. Comparison of the studied varieties by the content of extractive and protein substances in grain, accumulated at moderate and increased level of nitrogen nutrition, gave us grounds to differentiate the studied varieties as brewing, groats and fodder. In the varieties of target use in the variants of experience on the content of extractive substances in the grain, marked differences were revealed. The homeostability indicator, which takes into account the level and stability of the technological indicator in the brewing barley group has allocated the variety Nadezhnyi (1 568,94), in the forage group – the variety Yaromir (1 692,22), in the groats group – the varieties Raushan and Nur (1 779,80–1 833,72). The complex rating of the main economically important quality traits confirmed the high commercial value of varieties Nadezhnyi, Yaromir and Raushan for targeted use in intensive technologies.

Dedushev Ivan A., Eroshenko Lyubov M., Romakhin Maxim M., Boldyrev Mikhail A., Romakhina Viktoria V.

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