Abstract
During five rotations of a ten-field crop rotation in a stationary field experiment, the influence of annual application of fertilizers on productivity and quality of sunflower seeds (Helianthus annuus L.) was studied. The dynamics of the nutrient regime in the soil layers of 0–25 and 25–40 cm during the vegetation period was studied. It is shown that the optimal dose of fertilizers for the sunflower should be considered N60P60K60, which provides an increase in yield by 0.4–0.7 t/ha, while the oil collection increases by 25% compared to the background without fertilizers (0.8 t/ha). Economic takeaway from the biological, taking into account the root system on a natural background, was 50% nitrogen, 54% phosphorus, and 12% potassium and was almost the same against the background of N60P60K60: 48, 51, and 9%, respectively. The change in the ratio of nitrogen, phosphorus, and potassium in the complete fertilizer did not affect the oil collection. Separate application of phosphorus and potassium fertilizers was inefficient. The conclusion was made that increasing the dose of fertilizers is not economically feasible.
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