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Purpose: to conduct research dedicated to assessing the impact of primary soil cultivation techniques and the microelements application on the yield of cereal and leguminous grain crops. Materials and methods. The effect of moldboard plowing (25–27 cm), flat-cutting (20–22 cm), minimum surface tillage (8–10 cm) and no-tillage on the yield of leguminous crops (soybeans, peas, chickpeas) and cereal grains (spring wheat, Sudan grass) is studied. The studies were conducted at the experimental production farm of the Volga Research Institute of Hydraulic Engineering and Land Reclamation in 2022–2024 using generally accepted methods. Results. The impact of basic tillage techniques and the impact of micro-fertilizers on vegetation in cereal and leguminous crops agrocenoses on productivity and its structure have been studied. The use of flat-cutting and the micronutrients application for cereals and legumes increased the yield indicators on average for soybeans – by 65.9 %, peas – 48.5 %, chickpeas – 41.8 %, spring wheat – 61.3 %, Sudan grass – 26.3 % compared with the no-tillage option. The maximum yield was obtained on soybeans with the use of flat-cutting tillage – 3.45 t/ha, and the minimum at no-tillage – 1.94 t/ha. The impact of flat-cutting tillage on the spring wheat productivity is expressed by an increase in yield by 0.34 t/ha, compared with no-tillage. Chickpea yield is higher when using flat-cutting tillage with leaf dressing – 2.75 t/ha, and without tillage and dressing – 1.87 t/ha. The yield of Sudan grass of two staves when using flat cutting tillage with the micronutrients application on vegetation is 40.37 t/ha and 31.50 t/ha with no-tillage. Conclusions. For the soil and climatic conditions of the dry steppe Volga region, it has been proven that when cultivating chickpeas, soybeans, peas, Sudan grass and spring wheat as examples, the best indicators of the crop structure were achieved in variants using flat-cutting tillage against the background of the micronutrients application to vegetative plants.

Purpose: to study methods to control weed infestation of crops by resource-saving methods of soil tillage, ensuring improvement of the phytosanitary condition of the irrigated agrocenosis. Materials and methods. The test scheme included studying the impact of moldboard plowing at different depths, flat-cut and surface primary tillage on weed infestation of crops. The features of agrotechnical methods in weed control were studied on experimental plots in Saratov region in 2021–2023. The experimental methodology is generally accepted. Results. The influence of different methods of primary tillage on weed infestation of agricultural crops in the crop rotation link under irrigation is considered. It is revealed that with the use of pre-sowing tillage and inter-row tillage during the crop vegetation period, a significant decrease in weed infestation of lands for the next crop is noted. For the first crop of the link – Sudan grass – the highest weed infestation was noted in the variant of minimum cultivation at 8–10 cm, the number of weeds was 26.0 pcs./sq. m. During the vegetation period, due to the high density of standing, the weed infestation of crops before harvesting decreased in all variants of the experiment. On the second crop of the link – spring wheat – and the third crop – soybean – the weed infestation varied insignificantly in all variants of the experiment. Weed control provided the biological yield of green mass of Sudan grass of 32.7–37.5 t/ha, spring wheat grain – 3.30–3.59 t/ha, soybean – 4.09–4.35 t/ha according to the variants of the experiment. No significant difference in the impact of the method of primary tillage on crop yield was revealed. Conclusions. Using the example of soybeans, Sudan grass and spring wheat, it has been proven that during their cultivation, using ploughing with furrow slice upside-down in the fall in combination with pre-sowing tillage and inter-row tillage during the crop vegetation is effective.

Purpose: to study the efficiency of using stimulating biologics on the productivity of leguminous crops in irrigated agrocenoses of the Volga region. Materials and methods. The field experience was laid in 2021–2023 on grain feed crop rotation. On the basis of the experimental production farm of the Volga Research Institute of Hydraulic Engineering and Land Reclamation, studies were conducted on the use of stimulating biological preparations in the leguminous crop cultivation: an inoculation preparation containing Mesorin 7 + Rhizotorphin, which contains a fungicide + nitrogen-producing bacteria of high concentration; micro-fertilizers according to the phases of vegetation of leguminous crops, containing trace elements and amino acids. The control option was without the use of stimulating biologics and micronutrients. The following leguminous crops were used in the experiment: Marina soy varieties, Alpha peas and Russian black beans. Results. In the course of research, it was found that when seeds are treated before sowing with the biological preparation Mesorin 7 + Rhizotorphin, the growth of green mass from the flowering phase to the full ripeness phase of seeds is slow: peas – 1005.3–1153.5 g/m², soybeans – 2092.3–2997.3 g/m², beans – 3121.3–3324.3 g/m². When processing crops with micro fertilizers during the growing season to the phase of the beginning of bean formation, the increase in aboveground mass is: peas – 1668.5 g/m², soybeans – 2772.3 g/m², the highest value was found in beans 3140.5 g/m². The positive effect of stimulating biologics on the productivity and quality of leguminous crops when cultivated on irrigated lands was revealed. The maximum biological yield was achieved with the use of a set of micro fertilizers during the period of growth and development of soybean plants – 3.83 t/ha, peas – 1.52 t/ha, and the most promising is the production of beans with a yield of 13.08 t/ha. Conclusions. The results of studying the features of the formation and productivity of the agrophytocenosis of leguminous crops confirmed the high efficiency of the use of stimulating biological preparations and micro fertilizers to increase the yield on irrigation.