PROSPECTS OF SOYBEAN CULTIVATING IN THE PRIMORSKO-CASPIAN SUB-PROVINCE OF DAGESTAN

In the period from 2022 to 2023, field studies were conducted aimed at increasing the productivity of soybean varieties. At different doses of the X-Site regulator, the expediency of growing soybean varieties Vilana, Slavia, Alba, Chara, Olympia was studied. As a result, it was revealed that the maximum leaf surface was noted on the crops of the Slavia variety - an average of 36.1 thousand m2/ha. The difference with the data of the Vilana, Alba, Chara and Olympia varieties was noted in the range of 6.2; 13.9; 22.0; 30.3%. The next position in this indicator is occupied by the data of the Vilana variety - 34.0 thousand m2/ha. The largest leaf area of the soybean variety was formed at a dose of the X-Site growth regulator of 0.75 l/ha - an average of 35.2 thousand m2/ha, the excess with the data of the control variant was 23.9%, with the second variant (0.5 l/ha) – 14.2%, and with the data of the fourth variant (1.0 l/ha) -4.4%. The net photosynthetic productivity (NPF) of the standard (Vilan) was noted at the level of 2.86 g/m2 day, an excess of 21.7% was observed in the Slavia variety. Low values in the range of 2.55-2.48 g/m2 day were recorded on crops of Chara and Olympia varieties. A clear dependence of the NPF in the studies was observed on the applied doses of the X-Site regulator. If in the first variant (control) it averaged 2.43 g/m2 day, then at a dose of 0.5 l/ha, the NPF increased by 15.2%. When treated with a dose of 0.75 l/ha, this indicator was the maximum (3.02 g/m2 day). The maximum productivity (3.34 t/ha) was provided by the Slavia variety, and the minimum productivity was provided by the Chara and Olympia varieties. The highest productivity of the variety was achieved with an increase in the dose to 0.75 l/ha - 3.25 t/ha, which is 27.9% more than the control, and 16.5% more than the second variant (0.5 l/ha). The most acceptable yield indicator, at the level of 3.01 t/ha, was also noted at a regulator dose of 1.0 l/ha.