Productivity change of awnless brome due to application of various agrochemicals
The results of studies of field experiments on possibility of achieving highly productive agrocenoses of awnless brome due to application of various agrochemicals at different times are presented. To achieve the above goal, studies on agrochemical effects on awnless brome seed-breeding plots were carried out in OAO Mordoviagosplem in Ozerny village, the city of Saransk, the Republic of Mordovia in 2018-2020. Scheme of a two-factor experiment included: Factor A - Time of application of agrochemicals. 1 - At the beginning of spring regrowth, 2 - At booting stage, 3 - In the phase of spring regrowth + booting stage. Factor B - Types of agrochemicals. 1. - Without application of agrochemicals (control). 2. - Megamix Profi. 3. - Megamix-nitrogen. 4 - Albite. It was revealed that maximum weight of 25 shoots, compared with the control, was noted in case of Albit application in the phase of growth, tillering, growth + tillering (79.6; 86.0; 87.0 g); Megamix-Profi (80.4; 80.6 g) and Megamix-Nitrogen (84.8; 82.5 g) in the phases of tillering and growth + tillering. The most intensive shoot formation (533 pcs./m<sup>2</sup>) was noted in case of double application of Albit, its application at the time of spring regrowth provided maximum economic efficiency coefficient (0.04) and aboveground mass yield (18.54 t/ha). Application of Megamix- Nitrogen (531, 466 kg/ha) and Albit (507, 463 kg/ ha) in the spring regrowth and booting phase, as well as Megamix-Profi (508 kg/ha) in booting phase contributed to formation of predominant seed yield.