Abstract:
The results of research in a dark-brown soil on the effects of Helafit Combi®
, Myr ® and Mifosat® plant
growth regulators on the yield of sunflower hybrids in the conditions of insufficient moistening of the steppe
zone of Ukraine conducted in 2015 – 2017 have been interpreted. It was established that the studied growth
regulators for their one-time introduction during sunflower vegetation contributed to the improvement of
plant development, increased the intensity of growth processes at all stages of organogenesis due to the
activation of growth processes, and intensified the adaptive capacity of sunflower agrocenosis to adverse
climatic conditions. The use of growth regulators had positive effect on formation of higher yield of sunflower
seeds. Thus, the greatest increase in the yield of sunflower hybrid seeds was observed when treating plants with
Helafit Combi ®.growth stimulating fertilizer. The increase in comparison with a reference sample observed in
Forward hybrid was +0.51 t / ha, and in Zaklyk hybrid +0.47 t / ha. Somewhat lower yields were observed after
foliar introduction of Myr ® and Mifosat ® fertilizers.
