Influence of organomineral fertilizers on winter wheat yield after non-fallow predecessors in the Steppe zone

Тopicality. The growing needs of modern agricultural production require the search for new approaches and methods to increase crop productivity. Therefore, research and application of plant growth biostimulants in the form of liquid organomineral fertilizers are extremely relevant issues, alt-hough not yet adequately studied. Issues. Lack of detailed study of biostimulants, the application of which has an extremely low cost and relatively significant effect, causes the insufficient implementation of plant growth stimulants in the production process. Aim. To determine the level of winter wheat yield depending on the application of organomineral fertilizers HFAC-1 and HFAC-3 (Humic and Fulvic Acid Concentrate). Materials and methods. The research of organomineral fertilizers HFAC-1 and HFAC-3 was carried out in winter wheat fields of Slavna variety, sowing was performed in the optimal dates after sunflower and peas as predecessors. The soil of the experimental site is the full-profile low humus medium depth ordinary chernozem. The area of the accounting plot is 50 m2, the experiment is repli-cated 3 times. Results and conclusions. It was found that the highest average yield under the winter wheat cultivation after sunflower (4.06 t/ha) were obtained when crop was sprayed with HFAC-3 in combination with Abacus fungicide in the heading stage of plants, as well as when HFAC-3 was applied as foliar fertilizer in the end of the spring tillering stage, and later, plants were sprayed with HFAC-3 when the flag leaf was visible. These applications resulted in an increase in grain yield compared to the control by 0.33 t/ha. The liquid organomineral fertilizers positively influenced winter wheat was grown after peas, and also when seeds were dressed with these fertilizers. Key words: winter wheat, organomineral fertilizers, plant growth stimulants, predecessor, yield.