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The article presents the results of research on the effect of various biological preparations on productivity and formation of elements of grain yield structure of mid-season hybrid maize DKS 4014. A promising direction to increase plant productivity of maize and realization of its biological potential is the ecologization of cultivation technology of crops, creation of effective, environmentally safe biological preparations and development of technologies of their application is one of the priority directions in the scientific support of the agroindustrial complex of Ukraine. The use of such preparations is possible, both independently and in combination with other components of cultivation technology, such as mineral fertilizers and plant protection products. The use of biological preparations restores soil structure, restores fertility and accelerates the mineralisation processes in the soil.The effect of soil application of biofertilizer based on active strains of phosphorus-mobilizing and nitrogen-fixing bacteria and physiologically active substances, both alone and in combination with mycorrhizobearing bio-preparation treatment of maize seeds for active settling of root and root zone of maize hybrids was studied. The results of the obtained results of the study of biometric indicators, grain yield of maize depending on the application of soil biofertilizer, mycorrhizoforming biological preparation, and the combination of these preparations, as well as the application of soil herbicide together with a carrier-adhesive showed the improvement and increase in biometric indicators and productivity of maize, so we recommend the use of these preparations in the conditions of production. The best indicators of improving the structural elements of maize yield and yield in general were provided by the complex of preparations Graundfiks 4 l/ha + Micofrend 6 kg/ha, where the yield of mid-season hybrid DKS 4014 was 13.65 t/ha, which is 29.9% more than the control.

ELEMENTS OF YIELD STRUCTURE OF MAIZE HYBRIDS DEPENDING ON THE APPLICATION OF BIOLOGICAL PREPARATIONS IN FOREST-STEPPE CONDITIONS