THE EFFECT OF PRESOWING SEEDS AND CROP TREATMENTS WITH COMPLEX PLANT GROWTH REGULATORS ON THE CORN HYBRIDS YIELD

Abstract

The purpose. The level of crop productivity is a determining criterion for the effectiveness of the use of new elements in field crop cultivation technologies. In addition to the traditional elements that affect this indicator, it is important to use new-generation complex preparations of leading world and Ukrainian companies. Such preparations with a complex of macro- and microelements with a growth-regulating effect include Vitazym and Vuksal, which we used on corn crops during the growing season and for pre-sowing seed treatment. Accordingly, the purpose of our research was to scientifically analyze and practically substantiate the impact of the pre-sowing seeds and corn crop treatments with complex plant growth regulators Vitazym and Vuksal on grain yield in the Left Bank Forest-Steppe of Ukraine. Research materials and methods. The research was conducted in 2015-2017 in the Pyriatyn district of the Poltava region on typical medium loamy chernozems. Meteorological conditions varied by year of research in terms of rainfall and temperature regime. During the research, analytical methods were used, field and laboratory studies were conducted, and statistical and mathematical data processing was carried out according to generally accepted scientific methods. Thesubject of the research was three corn hybrids: Dniprovsky 257 SV – control, Alekksandra, and Okksizhen. The experimental scheme included seven options. The results. The article presents the research results that indicate a high adaptability of the studied hybrids to growing conditions and their positive response to the plant growth regulators use.Thus, a difference in the yield levels of hybrids by experiment variants by year and on average for 2015-2017 was observed. In the Dniprovsky 257 SV hybrid, they varied from 9.62 t/ha in the control variant to 11.28 t/ha with the use of the Vitazym growth regulator and 11.20 t/ha of Vuksal fertilizer for pre-sowing seed treatment and in crop application on the 17th micro stage of plant development; the Alekksandra hybrid – from 10.08 to 11.92 and 11.83 t/ha, respectively; the Okksigen hybrid – from 9.85 to 11.64 and 11.31 t/ha with the indicated variants. Conclusions. On average, over the years of research, the Alekksandra hybrid with the complex treatment of seeds and crops by growth regulator Vitazym in the 17th micro stage of growth formed the highest yield – 11.92 t/ha, which exceeded the control option by 1.86 t/ha (18.25%), which is evidence of the feasibility of its wider introduction into production in the Left Bank Forest-Steppe of Ukraine.