Agriculture and forestry

Verheles Pavel Mykolayovych  – Candidate of Agricultural Sciences, Associate Professor of the department of botany, genetics and plant protection, Vinnytsia National Agrarian University (21008, Vinnytsia, 3 Sonyachna St., e-mail: pasha425@vsau.vin.ua, https://orcid.org/0000-0002-4101-1465).

According to the conclusions obtained after the research, it turned out that the use of growth regulators by treating spring barley crops during the tillering period had a positive effect on both the key biometric characteristics of plants and the components that form the yield. In particular, the height of the plants was within 66.3–71.3 cm. This indicator was 2.9–7.9 cm lower than the height of the plants in the control plot, which, on average for the entire research period, was 74.2 cm. In the variant with the use of Medax Top, SC, the total density of spring barley stems was recorded - 976 stems per m2. As for productive stems, when treated with Medax Top, SC, their number was 433 pcs/m2 throughout the experiment. This is 11-19 stems per m2 more than in the areas with the use of Chlormequat-Chloride 750, SL and Terpal, SL, and 27 stems per m2 more than without treatment. The average length of the ear of spring barley of the Green variety in the control was 7.2 cm, which is 0.4-1.1 cm less than in the variants where the studied growth regulators were used. The length of the ear in cases of using Medax Top, SC reached 8.3 cm, which exceeded the corresponding indicators when using the preparations Chlormequat-Chloride 750, SL and Terpal, SL by 0.4-0.7 cm. When using Medax Top, SC on spring barley crops of the Green variety, an average of 11.7 grains were recorded per ear, which is 1.3 more than on the untreated plot, and 0.4-0.9 grains more than in the variants where Chlormequat-Chloride 750, SL and Terpal, SL were used, respectively. The highest mass of 1000 grains was observed when Medax Top, SC was applied and was 53.4 g, which is 0.3 g more than in the variant with Chlormequat-Chloride, SL, and 1.2 g higher than the control indicator. The highest grain nature index of 661 g/l was recorded when using Medax Top, SC, which was 9 g/l higher than the grain nature when using Chlormequat-Chloride, SL and 30 g/l higher than the corresponding result of the untreated plot. The use of growth regulators on spring barley crops made it possible to achieve the maximum yield of 4.45 t/ha, using Medax Top, SC at a dose of 1.5 l/ha. The yield increased by 0.83 t/ha compared to the control, ensuring profitability at the level of 31.5%.

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