Optimization of spring barley seeding rates in the Volga region

Abstract

Studies on ordinary chernozem to identify the optimal seeding rate for modern technologies of spring barley cultivation in the conditions of increasing processes of aridization of the Volga climate are presented. In different weather conditions in the years (2019-2021), when testing 3 seeding rates without seed dressing (1.0, 3.0 and 5.0 million/ha) and 5 with the use of the Scenic Combi protectant (from 1.0 to 5.0 million/ha), the highest grain yield was established at seeding rates of 3.0-5.0 million/ha (Scenic Combi) – 2.66-2.73 t/ha, which is 0.24-0.87 t/ha more options with norms of 1.0 and 2.0 million/ha (Scenic Combi) and 0.28-1.12 t/ha options with norms of 1.0-5.0 million/ha (without seed dressing). The largest conditional net income of all the studied options was established when using the Scenic Combi protectant at the rates of 2.0-4.0 million/ha – 15079.5-16280.0 rubles/ha, which is 468.3-1669.2 rubles/ha (3.2-11.4 %) more than the best option without seed etching. The maximum level of profitability was obtained at seeding rates of 2.0 and 3.0 million/ha (Scenic Combo) 150.4-156.7 %, which is 17.8-51.3% more than the other studied options. Based on the data obtained during the cultivation of spring barley with the use of the drug Scenic Combi, after winter wheat, a seeding rate of 2.0-3.0 million / ha of germinating seeds is proposed.