At the educational and experimental field of the Omsk State Agrarian University, the evaluation of the influence of elements of the cultivation technology of bare barley of the Omsk golozernyy variety 2 (chemical background, sowing time, and seeding rate) on the indicators of the economic efficiency of grain production was carried out. On the background without the use of chemicals, as well as when using herbicides on the background of applying nitrogen fertilizer, the cost of grain per hectare is higher when sowing the crop in the third decade of May. The use of only herbicides (without fertilizer) provided a greater cost of grain at an earlier sowing. Among the studied seeding rates, the maximum cost indicators were observed when sowing 4.5 million viable seeds per hectare. The chemical background also influenced this indicator. The cost of grain per 1 hectare increased by 3,227 rubles with the use of a tank mixture of herbicides, as well as by 4,513 rubles with their complex use with fertilizers (in comparison with the chemical background). At the same time, the strengthening of the chemical background led to an increase in costs per 1 hectare by 1,559 and 3,543 rubles, respectively. An increase in the seeding rate was also accompanied by an increase in costs. The use of herbicides did not lead to a significant change in the cost of grain, but the additional use of nitrogen fertilizer led to its growth. The level of profitability in the version with the use of a tank mixture of herbicides coincided with the option without the use of chemicals (113.1%). The application of nitrogen fertilizer reduced profitability to 81.5% despite the fact that their use was justified by an increase in grain yield. Thus, when considering specific options for the cultivation of bare barley, sowing on May 14-18 with a rate of 4.5 million viable seeds per hectare while using the Puma Super 7.5 herbicides tank mixture, EMV (0.9 l/ha) and Turbo Pruner, MD (75 ml/ha) should be allocated.

The cultivation technology elements of hulless barley were studied at the experimental field of the Omsk State Agrarian University, including 3 chemicalization backgrounds: without chemicalization, with herbicides (Puma Super 7.5 + Sekator Turbo) and with herbicides + fertilizers (ammonium nitrate N60); 3 sowing dates: May 14th-18th, May 25th-28th, June 4th-6th; 3 seeding rates: 3.5, 4.5 and 5.5 million germinating grains per hectare. On backgrounds with no fertilizers, the field germination rate of the crop averaged 68.6% and 68.9%; it decreased to 68% at a fertilized background. Minimum germination rates were when sowing was on May 25th-28th; maximumwhen sowing was on June 4th-6th. When there is an increase in the seeding rate, the field germination decreases. The ratio of weeds in the control variants averaged 25.4%, herbicides reduced the weed ratio to 3.9 -8.2%; the effectiveness of herbicides at a fertilized background was lower. The weed ratio decreased from the early to later sowing dates and as the seeding rate increased. In plots without chemicalization, the weight of one weed plant was 1.80 g, in variants with herbicidal treatment -1.91-1.92 g. It reached its maximum value on crops that were sowed at the third decade of May. The weight of one cultivated plant at a background without chemicalization was 3.89 g, at a background with herbicides -4.44 g, at a background with fertilizers and herbicides -5.03 g; an increase in the seeding rate led to a decrease in the weight. In control variants, an average of 42.9% of barley plants survived; 51.0% -with the use of herbicides; 49.0% -with fertilizers and herbicides. As the seeding rate increased, the viability was reduced. Thus, the optimal conditions for the development of barley plants in agrophytocenosis were formed at the background of the use of nitrogen fertilizer (N60) and spraying of crops with a mixture of herbicides Puma Super 7.5, oil-water dispersion and Sekator Turbo, oil dispersion.

For feed production in particular and animal husbandry in general an important aspect is the improvement of technologies for the cultivation of various forage crops. The purpose of the research was to optimize the technology of cultivation of hulless barley under the environments of the Southern forest-steppe of Western Siberia due to the timing of sowing, seeding rates and the use of chemical agents. The technology of cultivation of hulless barley of the Omsk hulless barley 2 variety on meadow-chernozem soil in the Southern forest-steppe of Western Siberia has been scientifi cally proved and practically confi rmed. The optimal values of the elements of technology such as sowing rate, sowing date and the level of chemicals and their impact on yield and grain quality of hulless barley. The dependence of each element of the technology on the infestation and water consumption of barley has been established. Among the used seeding rates, the grain yield was higher at 4,5 million/ha – 2,56 t/ha. Close result was at 5,5 million/ha – 2,54 t/ha, but taking into account the greater consumption of seeds this option loses. A decrease in seeding to 3,5 million/ha led to decrease in grain yield to 2,37 t/ha. The share of the seeding rate in the yield change was 6,2 %. The optimal yield of gross energy has been observed at the fi rst sowing period and the seeding rate 4,5 million/ha. The increment of gross energy as the diff erence between its output and the total energy consumption reached a maximum against the background of herbicides 32,363 MJ/ha. Here the energy coeffi cient was higher 4,62. Both in terms of bioenergy and economic effi ciency, the best option was to plant 4,5 million/ha against the background of the use of herbicides.