Studying the reaction to the abiotic conditions of the Middle Urals in 16 varieties of oil flax will allow to adapt the culture: increase its productivity and product quality. As a standard, the variety ‘VNIIMK 620’ was sown. The experiments were laid on sod-podzolic medium loamy soil in the grain-grass rotation after winter crops during 2012-2015. During the years of research, the plow layer of the experimental plots had different humus contents - medium and high, mobile phosphorus and exchange potassium - medium and very high, exchange soil acidity - slightly acidic and close to neutral. To a greater extent, by 91.5%, the change in the seed yield of the studied oil flax varieties depended on the abiotic conditions of the growing season; the share of the influence of the genotype of the variety in the formation of seed yield was 3.0%. Meteorological conditions during the years of the experiments were characterized by large fluctuations in the average daily air temperature and the amount of precipitation that fell over the months, in consequence of this the seed yield of flax oil varied in wide range over both varieties and years of study. The most favorable abiotic conditions for the formation of oil flax seeds were formed in 2014, when, during the ripening period of the seeds optimal meteorological conditions have developed with hydro thermic factor of 1.0. This contributed to obtaining the highest seed yield in 2014 - 218 g/m2. On average, over four years of research, the same response to abiotic conditions with seed yield was formed in ‘VNIIMK 620’ varieties from Russia, ‘Clark’ varieties from Holland and ‘Barbara’ from Hungary. The most plastic grade is ‘Clark’ with a plasticity coefficient bi = 1.33. The most stable seed yield is the ‘Norlin’ variety with a stability coefficient of 32.2. Russian varieties ‘LM-96’, ‘N 3829’ and foreign varieties ‘Norlin’, ‘Atalante’ proved to be the most adaptable to cultivation conditions in the agroecological conditions of the Cis-Ural region and can be considered promising in terms used as starting material in the breeding process.

Mass spectral method with inductively coupled plasma (MS) and atomic emission method with inductively coupled plasma (AES) at ASIC VNIIMS named after N.M. Fedorovskiy 53 chemical elements and 8 oxides in sod-strongly-podzolic light loamy soil were determined. Soil samples were taken from horizons А1 (deposit) and Ап (arable land) during long-term agricultural use in SKhPK named after Michurin of Vavozhskiy district of the Udmurt Republic. Relative to horizon А1 (deposit), in the plow layer there is a higher content of zinc, cadmium and lead - elements of the toxicity class 1, copper - element of the toxicity class 2, barium, strontium and tungsten - elements of the toxicity class 3. In accordance with the requirements of the hygienic standard GN 2.1.7.2041-06, only the arsenic content exceeded maximum permissible concentration. Among the oxides in the arable layer Ап, an increased content of magnesium and iron oxides was noted, compared with their concentration in the А1 horizon (deposit). In the course of the study, it was found that the studied sod-strongly podzolic light loamy soil with long-term agricultural use is characterized by an increase in the content of zinc in the arable layer by 16.8, lead by 0.4, cadmium by 0.11 μg/g, barium by 33.1, strontium by 3.1 and tungsten by 0.11 μg/g relative to their concentration in the А1 horizon (deposit). According to the content in the arable layer of heavy metals sod-strongly podzolic light loamy soil SKhPK named after Michurin of Vavozhskiy district of the Udmurt Republic can be classified as soil with a low level of pollution. According to the total pollution indicator, the soil corresponds to the category of permissible pollution level.

The productivity of barley Raushan 24.9-53.1 tons per hectare on the farm (SKHPK) them. Michurin, Vavozhsky district of the Udmurt Republic for 2013-2019 had a positive average correlation (r = 0,46) with the pH of the arable layer, a positive weak correlation with the content in the arable layer of mobile phosphorus (r = 0,26), exchange potassium (r = 0.12) and humus (r = 0,12). The crop of 2017, had more potassium, sulfur, phosphorus, magnesium, silicon, calcium, sodium, manganese, tin, iron, rubidium, strontium, barium, zirconium, copper, zinc, titanium, selenium, nickel, vanadium, gadolinium, lithium, germanium, cobalt, tungsten, beryllium, cadmium, than their content in the grain of the 2018 crop. In 2018, the yield was lower by 14,2 centner per hectare of the 2017 crop, and barley kernels contained more bromine, aluminum, boron, molybdenum, thorium, chromium, cerium, lanthanum, niobium, tantalum, gallium

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