What question did this study set out to answer?

To evaluate the impact of foliar fertilizers and plant growth regulators on the productivity and quality of high-oleic sunflower hybrids.

June 18, 2026Open Access

Productivity and Quality of High-Oleic Sunflower Seeds as Influenced by Foliar Fertilizers and Plant Growth Regulators in the Left-Bank Forest-Steppe of Ukraine

Key Points

To evaluate the impact of foliar fertilizers and plant growth regulators on the productivity and quality of high-oleic sunflower hybrids.
Conducted a three-year field experiment in Ukraine's Left-Bank Forest-Steppe region.
Assessed seven different foliar applications on five high oleic sunflower hybrids.
Measured parameters included plant height, seed yield, oil content, and oleic acid content.
Hybrids PR64H32 and SY Experto achieved the highest average seed yields at 3.73 t/ha and 3.69 t/ha respectively, with no significant differences (P<0.05).
Sequential foliar applications increased average seed yield by 0.19-0.36 t/ha compared to control.
Foliar applications resulted in oil content increases of 0.6-1.6% and oleic acid content increases of 1.8-4.1% across hybrids.

Abstract

Ukraine has maintained its position as leading producer of sunflower seeds in the world for the past decade. Concerning diet, higher oleic acids are ideal. Sunflower (Helianthus annuus L.) hybrids have high genetic potential for seed yield above 5 t/ha and oil content in seed greater than 50%. Yet, environmental factors seems to limit current sunflower yields to the production range of 1.5-3.0 t/ha. A three years field experiment was conducted in the Left-Bank Forest-Steppe of Ukraine (Latitude: 49.6; Longitude: 34.9; altitude 113 m) to assess the influence of seven different foliar applications of fertilizers and plant growth regulators (control; Sol Bor + Basfoliar 6-12-6; Basfoliar 6-12-6; Wuxal Bio Aminoplant + Wuxal Boron; Wuxal Boron; Spectrum Askorist + Spectrum B + Mo; Spectrum B + Mo) on productivity and quality of five new high oleic sunflower hybrids (SY Experto, Antratsyt, ES Ballistic, Oplot, PR64H32). Foliar applications positively influenced all parameters studied (plant height, leaf surface area, number of seeds per head, seed yield, oil content and oleic acid content). The highest average seed yields occurred in the hybrids PR64H32 (3.73 t/ha) and SY Experto (3.69 t/ha) with no significant difference (P0.05). However, PR64H32 generated a significantly (P0.05) higher average seed yield than the other hybrids. Except for Wuxal Boron (sprayed twice sequentially) with an average seed yield of 3.53 t/ha, sequential spraying of Wuxal Bio Aminoplant + Wuxal Boron thrice on all hybrids, ensured a significantly higher average seed yield (3.58 t/ha) than the other foliar sprays. Based on foliar sprays, the increase in seed yields ranged from 0.19-0.36 t/ha when compared to control. Foliar sprays also caused increases in oil content between 0.6-1.6% compared to the control with average oil content for the various hybrids fluctuating between 48.4-49.3%. Average oleic acid content ranged from 71.5-83.7% for the investigated hybrids and foliar applications increased the average oleic acid content by 1.8-4.1%. The combined factors of hybrid and foliar applications had the greatest

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