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A three-factor field experiment (tillage and fertilizer systems, biostimulants) was carried out in the Samara region in 2016 and 2017 on two experimental fields in crop rotation: bare fallow – winter wheat – spring wheat – sunflower. There were two main tillage systems: minimum tillage and No-Till; two soil fertilizer systems: without and with fertilizer (N12P52); liquid mineral fertilizer and biostimulants: control, Megamix N10, Aminocat 10% + Raykat Growth. In 2016, the yield of spring wheat on plots with No-Till was 10% higher, and in wet and cool 2017 it was 5% lower than in wheat crops with minimal tillage. In 2017 in experiments with soil fertilizer (N12P52) the grain number per spike increased by 37% (No-Till), and grain yield of spring wheat – by 23% (minimum tillage), in 2016 respectively by 13-15% and 14% (No-Till and minimum tillage) compared to plots without soil fertilizer. In 2017 (2016) in experiments with Megamix N10 the number of productive tillers per plant increased by 5 (2)%, thousand grain weight by 12 (2)%, grain yield by 12 (6)%; with Aminocat + Raykat Growth by 7 (10)%, 22 (4)% and 44 (14)%, respectively, compared to plots without their use. Minimum soil tillage and No-Till create favorable conditions for the development of weeds, diseases and pests in spring wheat crops. This necessitates the use of herbicides, fungicides and insecticides in its cultivation.

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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.