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The paper shows the research results related to the development of methods to increase the yield of spring wheat using Megamix liquid mineral fertilizers in the presowing treatment of seeds, treatment of crops on vegetation when introducing mineral fertilizers in seedbed preparation in the forest-steppe conditions of the Middle Volga region. The studies were carried out on the experimental field of Samara State University in 2017-2020. During the three-factor field experiment, dry matter accumulation and photosynthetic activity were evaluated with the analysis of photosynthetic potential and net productivity of photosynthesis. It was established that the best indicators are formed on versions with the treatment of seeding material with Megamix Seeds or Megamix Profi agents with subsequent double treatment on vegetation with Megamix Profi in the amount of 0.5l/ha (in the tillering phase) + Megamix Nitrogen in the amount of 0.5l/ha (in the flag leaf phase) against the background of N32P32K32 fertilizer application. The application of Megamix agents in the system of seed treatment + treatment of crops with Megamix stimulating agents provides the maximum accumulation of dry matter in the version of Megamix Seeds treatment and the treatment of crops with a mixture of Megamix Profi + Megamix Nitrogen – 591.9 g/m on soft crops and 622.6 g/m2 – durum wheat against the background of N32P32K32 application. The maximum photosynthetic potential of 0.968…1.091 million m2/ha per day is formed in these versions, and, consequently, the maximum yields with values of 3.73 t/ha on soft wheat crops and 3.44 t/ha on durum wheat crops. It was found that the use of liquid mineral fertilizers on all versions of the experiment reliably increases the yield of spring wheat.

The Middle Volga forest-steppe was subject to a comparative assessment to evaluate the effectiveness of combined insect-fungicidal pesticides as regulators of a phytosanitary state of farming ecosystems and yields of winter wheat. Insect-fungicidal pesticides used for pre-sowing treatment do not guarantee unconditional success, but they help to significantly reduce pest-induced losses and obtain safer grain produce. Regulated seeding rates showed that, once applied, combined dressing agents become slightly less biologically effective with overcrowding or thinning of crops. Dividend Supreme effectively reduced damage to shoots by Swedish flies, slightly worse than Celest Top. Celest Top and Dividend Supreme ensured stable suppression of root rot during the years of research. The winter wheat increasingly lodged when Celest Top and Dividend Supreme were used for seed dressing compared to the control (without dressing). Insect-fungicidal dressing agents increased the yield of winter wheat compared to the control and, at the same time, the risk of lodging. This effect was especially noticeable when Celest Top was used. It is recommended to use the combined Dividend Supreme and Celest Top pesticides for ensuring a stable phytosanitary situation and obtaining a high-quality harvest with a seeding rate of the target crop of 2-3 million seeds per 1 ha.

The methods of increasing productivity of sunflower hybrids using fertilizers and a micronutrient mixture Agromineral in the forest-steppe of the Middle Volga were described. The results of 2017–2018 studies are presented. The leaf area, the photosynthetic potential, the crop structure and the yield at different doses of fertilizers were assessed. The maximum value of the photosynthetic potential is formed by crops of the mid-season hybrid 8H477KLDM (4.386 million m2/ha per day). The use of fertilizers and micronutrient mixtures increases the photosynthetic potential and productivity by 9.09 ... 9.36 c/ha with an absolute value of 29.46 ... 31.83 c/ha.

The research was carried out in order to increase the productivity of oilseed flax and spring rape in Northern Kazakhstan. Experimental studies were conducted from 2012 to 2014 in Kostanay research Institute of agriculture (Republic of Kazakhstan). The experiment studied the sowing of flax and spring rape – 2nd decade of May; 3rd decade of May; 1st decade of June and the seeding rate for flax is 6.5; 7.0 and 7.5 million viable seeds/ha for spring rape – 2, 0; 2.5 and 3.0 million viable seeds/ha. During the years of research, the best coefficient of water consumption of the studied crops showed the second sowing period the third decade of May. According to the seeding standards, the formation of an optimal stem density increased the efficiency of moisture use. It was noted that moisture was most rationally consumed when sowing oilseed flax with a norm of 7.0 million sunflower seeds/ha (16.5-17.7 mm/c), spring rapeseed with a seeding rate of 2.5 million sunflower seeds/ha (9.9-11.2 mm/c). Oilseed flax sowing in the 3rd decade of May with a seeding rate of 7.0 million seeds/ha allowed to obtain the highest indicators of plant productivity in the experiments: yield is 13.1 c/ha, oil yield is 5.4 c/ha. In spring rape, the optimal sowing period was also the third decade of May; according to the seeding rate, the variant of 2.5 million suns excelled. seeds/ha sown in a given period: yield is 22.9 c/ha, oil collection is from 1 ha 9.4 c.

The article presents the results of scientific research on the growth-stimulating preparations in the pre-sowing treatment of soybean seeds and crops according to the development phases in the foreststeppe zone of the Middle Volga. It contains the results of the 2016-2018 research with an assessment of indicators of plant safety, photosynthetic activity and soybean yield in different treatment options by growth factors. The two-component preparations in pre-sowing seed treatment contribute to better soybean germination up to 78.12%. The pre-sowing treatment of seeds with Risotorphine and Raykat Start preparations forms the maximum leaf area. Comparing three years, we can say that the leaves work more productively in the variants with the use of Risotorphine and Raykat Start in pre-sowing treatment. Weather conditions in 2018 allowed soybean crops to form a high yield. The yield level was in the range of 1.48 - 1.98 t / ha. Inoculation of seeds with Raykat Start followed by crops treatment in the phase of 3-5 leaves and budding allowed achieving maximum yield for all years of research. After treating the seeds with Raykat Start, the maximum grain yield was 1.40 t/ha with a double-treatment of crops by microfertilizing mixture Megamix Profi in a phase of 3-5 leaves and budding.