The influence of biological preparations on the formation of quantitative indicators of spring barley variety «Bravyi» under different nutritional backgrounds

Abstract

Goal of research was to study of the effect of microbiological preparations on biometric indicators formation of spring barley plants (Hordeum vulgare L.) under mineral and organic fertilization systems (spring barley variety «Bravyi»). The research was carried out in the field crop rotation of the Donetsk State Agricultural Science Station of the National Academy of Agrarian Sciences of Ukraine in 2021-2023 on two nutritional backgrounds: mineral (N30P30) and organic (biohumus – 1000 kg/ha). As a result of quantitative analysis the highest tillering coefficient of spring barley at the end of the tillering phase on a mineral nutrition background was when using «Microhumin» and «Baikal» preparations for seed treatment (1.9); on an organic nutrition background all options for using microbiological preparations for seed treatment contributed to the formation of the number of shoots at the level of 1.5-1.6 pcs. The largest number of nodal roots on a spring barley plant on a mineral background (2.3) made it possible to form variants where seeds and crops were treated with biological preparations. On an organic background, an average of 0.1 pcs there were fewer nodal roots than on the mineral background. During plants analysis in the phase of full maturity, it was established that with a mineral nutrition background the highest coefficients of general tillering were in the variants with inoculation of seeds with «Microhumin» and spraying of crops with «Baikal» (1,9). «Baikal» (spraying of crops in tilling phase) and «Baikal» (seed processing) + «Biorhythm» (spraying of crops in tilling phase) variants had the highest coefficients of productive tillering (1.8 and 1.7 respectively). When using an organic nutritional background the best indicator of general tillering coefficient was obtained when inoculating seeds with the drug «Mikrohumin» (spraying of crops in tilling phase) –1.6, the coefficients of productive tillering ranged from 1.2 to 1.3. The use of Microbiological preparations application for seed treatment contributed to an increase in the tillering coefficient and secondary roots formation in spring barley plants regardless of the nutritional background. The number of total and productive stems was greater on the mineral nutrition background in all experimental variants. Key words: spring barley, mineral and organic fertilizing system, microbiological preparations, tillering phase, phase of full ripeness, biometric indicators.