Productivity of parental inbred lines – components of maize hybrids depending on plant density and treatment with biopreparations under conditions of drip irrigation

Aim. Investigate the influence of treatment of maize plants with restrictive biological products on the formation of productivity of lines - parent components to optimize the elements of cultivation technology. Methods. 3-factor field experiment; measuring and weighing - to determine the structure of the crop; methods of mathematical statistics (analysis of variance, rectilinear and curvilinear correlation and regression). Results. Studies have shown that for the maximum manifestation of the sign "mass of 1000 grains" the optimal density is 70,000 plants ha-1. The increase in yield is positively influenced by the increase in the weight of 1000 seeds, which is due to both the genotype of the lines and the use of biologically active drugs Bio-gel, Helafit-combi. With the use of the drug Bio-gel laboratory germination increased by an average of 1.5 %, with the use of the drug Helafit-combi seed germination increased by 2.4 %. Conclusions. The maximum yield of the parent component DK 247 was observed at a density of 80 thousand plants/ha and treatment with the drug Helafit-combi - 4.89 t/ha. Mid-late lines - parent components DK 411 and DK 445 showed the highest yields at densities of 70,000 plants ha-1 and treatment with Helafit®-combi - 4.65 and 6.30 t/ha, respectively.