Biological Effectiveness of Herbicides in Weed Control in Soybean Sowings

The biological effectiveness of modern herbicides in controlling weeds in soybean crops under irrigation in the north of the Astrakhan region has been determined. Field experiments were conducted during 2022- 2024 at the experimental irrigated land use site of the PAFSC RAS. The objects of the study were soybean varieties of domestic selection Volgogradka 1 and Aurora. The effectiveness of herbicides in the application of a soybean crop protection system against annual cereal and annual dicotyledonous weeds aimed at the formation of highly productive marketable products was studied. A comparative analysis of the use of selective herbicides based on the active substance metribuzine (Lazurit, SP) and metolachlor (Simba, KE) was carried out in order to identify the most promising option. A high biological efficiency (63.9%) of the soil herbicide Lazurit was established 30 days after its application, with the number of weeds in the control of 26 specimens/m2. On the 50th day after treatment, the decrease in the number of weeds was 59.9% with the number of weeds of 38 specimens/m2. The use of this herbicide led to a significant reduction in the number of weeds, which further affected the development of soybean plants.