Published in Scientific Papers. Series "Management, Economic Engineering in Agriculture and rural development", Vol. 22 ISSUE 1
Written by Raisa VOZHEHOVA, Tetyana MARCHENKO, Yurii LAVRYNENKO, Olena PILIARSKA, Pavlo ZABARА, Serhii ZAIETS, Andrii TYSHCHENKO, Serhii MISHCHENKO, Svіtlana KORMOSH

The article presents field research results on studying the effect of treating maize plants with growth regulating biological products on the formation of productivity of lines – parental components for optimizing the elements of cultivation technology. The experimental scheme included the effect of Bio-gel and Helafit®-combi biological products on the productivity of parental components of different FAO groups and genetic plasms of maize hybrids at different densities of 70,000, 80,000, 90,000 plants ha^-1. Studies have shown that for the maximum manifestation of the "weight of 1,000 grains" indicator the optimal density is 70,000 plants ha^-1. The increase in yield is positively influenced by the increase in the weight of 1,000 seeds, which is due to the line genotype and the use of the Bio-gel, Helafit®-combi biologically active products. Pre-sowing treatment of maize seeds with Bio-gel and Helafit®-combi increased laboratory seed germination. With the Bio-gel product applied, the laboratory germination increased by an average of 1.5%, with Helafit®-combi used seed germination increased by 2.4%. In our studies, the maximum seed yield in the early-ripening line of the DK 281 parental component was recorded at a density of 90,000 plants ha^-1 and the treatment with Helafit®-combi and amounted to 3.65 t ha^-1. The maximum yield of the DK 247 parental component was observed at a density of 80,000 plants ha^-1 and the treatment with Helafit®-combi and amounted to 4.89 t ha^-1. Mid-late lines DK 411 and DK 445 parental components showed the highest yields at densities of 70,000 plants ha^-1 and after the treatment with Helafit®-combi which amounted to 4.65 and 6.30 t ha^-1, respectively.

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