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Formation of winter wheat plant productivity elements depending on the effect of growth stimulants based on humic substances under different mineral nutrition backgrounds in the conditions of the Eastern Forest-Steppe of Ukraine

The article presents the results of two-year research on the effect of pre-sowing seed treatment and foliar feeding of crops with growth stimulants based on humic substances under different mineral nutrition backgrounds on the formation of plant productivity elements and biological yield of winter wheat variety Bohdana. A two-factor field experiment was set up using the split-plot method in three replications. The first-order plots were two nutrient backgrounds: 1 – control (without fertilizers); 2 – pre-sowing application of Makrostar complex fertilizer at a rate of N15P30K20 + feeding crops after soil physical maturity with urea at a dose of N50 + foliar feeding with urea in the 37th microphase according to the BBCH code at a dose of N10. The second-order plots included seven options for the use of humic-based growth stimulants for seed treatment and foliar application during the 31st microphase according to the BBCH code. Analysis of the obtained results showed a significant positive effect of the studied variants of growth stimulants on both nutrition backgrounds on the formation of higher plant productivity elements and a greater number of plants and lateral productive stems of wheat at the time of harvest. The greatest changes were observed in the biological grain yield, as optimization of the studied factors ensured an increase in all productivity elements. Among the growth stimulants studied, BlackJack showed the highest efficiency. Potassium Humate and Fulvihum growth stimulants had a similar effect on the formation of productivity elements and biological grain yield. Seed treatment combined with foliar feeding with these products on both nutrient backgrounds ensured significantly higher biological yield of winter wheat compared to the control, but was significantly inferior to the variants where the BlackJack growth stimulator was used.

Key words: winter wheat, fertilizers, growth stimulator, pre-sowing seed treatment, foliar feeding, productivity elements.

Ivanov S. https://orcid.org/0009-0006-6411-8851


Rozhkov A. https://orcid.org/0000-0001-9138-7973


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AGROBIOLOGY №2 2025