Uman National University | today: 05/31/2026
| Author(s) |
Rassadina I.Y., postgraduate, , Uman National University of Horticulture Коваленко О. В., , , |
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| Category | The Agronomy | ||
| year | 2026 | issue | Issue 108 part 1 |
| pages | 377-385 | index UDK | 631.8:631.445:633.853.494 | DOI | 10.32782/2415-8240-2026-108-1-377-385 (Link) |
| Abstract | Aim. To determine the influence of different doses of nitrogen and sulfur fertilizers on the formation of the soil nitrogen regime and the productivity of winter rapeseed under conditions of the Right-Bank Forest-Steppe of Ukraine. Methods. Field, laboratory, analytical, comparative, and statistical. Results. The results of two-year studies showed a significant effect of nitrogen and nitrogen-sulfur fertilization on the content and distribution of mineral nitrogen in the soil profile. The highest content of mineral nitrogen was observed in the 0–20 cm layer, where its concentration increased from 11,2–11,4 mg/kg in the control to 31,1 mg/kg under N150 in 2024 and to 23,2 mg/kg in 2025. The application of nitrogen in combination with sulfur contributed not only to an increase in mineral nitrogen content but also to a more uniform distribution throughout the soil profile. A decrease in nitrogen content with soil depth was established in all variants. Weather conditions influenced nitrogen dynamics, as in 2025 the overall nitrogen level was lower due to less favorable moisture supply. Winter rapeseed yield significantly increased with higher fertilizer rates. In 2024, yield rose from 3,16 t/ha in the control to 3,79 t/ha under N150 and reached a maximum of 4,16 t/ha under N150+S. In 2025, despite less favorable conditions, yield increased from 2,51 t/ha in the control to 4,16 t/ha under N150+S. The combined application of nitrogen and sulfur ensured more stable productivity compared to nitrogen-only fertilization. Hybrid response varied, with Daktari showing the highest and most stable productivity across treatments. Conclusions. Nitrogen fertilization significantly increases the content of mineral nitrogen in the soil and the productivity of winter rapeseed. The combined application of nitrogen and sulfur enhances nitrogen use efficiency, improves its distribution in the soil profile, and ensures stable yield formation even under unfavorable weather conditions. The highest efficiency was obtained with the N150+S fertilization system. | ||
| Key words | nitrates, ammonium nitrogen, sulfur, fertilization, yield, soil fertility | ||