Influence of growth stimulants on the elements of sunflower hybrids productivity in the conditions of the Southern Steppe of Ukraine

Abstract

Yaroslav Hadzalo, Rayisa Vozhehova, Yaroslav Likar, Tetiana Marchenko* and Oksana Tonkha

This study examines the influence of plant growth stimulants on the yield indicators of sunflower hybrids in the conditions of the Southern Steppe of Ukraine. Research methods included field trials to evaluate sunflower hybrid compositions and the application of plant growth stimulants, alongside statistical processing methods. The genotypic response of sunflower hybrids to growth regulators was established. The highest seed yield, at a level of 3.82 t/ha, was achieved with the hybrid 'Charodiy' using the biopreparation Vympel. The application of the biopreparations STIMPO and Vympel resulted in a significant increase in yield across all hybrids, ranging from 7.9% to 37.2%. The contribution of hybrid composition to seed yield was 68.2%, while the contribution of growth stimulants was 20.5%.