Margarita Nankova1,2 and Atanas Atanasov1,2
1 Agricultural Academy, Dobrudzha Agricultural Institute – General Toshevo, 9521 Petleshkovo, Bulgaria
2 Center of Competence “Agrifood Systems and Bioeconomy”, 4000 Plovdiv, Bulgaria
Nankova, М. & Atanasov, A. (2026). Elements of nitrogen metabolism based on the nitrogen uptake of common wheat (Triticum aestivum L.) cultivars grown in a four-field crop rotation. Bulg. J. Agric. Sci., 32(3), 617–630
In the period 2018–2020, characteristics of nitrogen metabolism in five cultivars of common winter wheat were studied. The experiment was conducted in a four-field crop rotation after the predecessors rapeseed, peas, sunflower and corn. Mineral fertilization was carried out with increasing nitrogen rates of 0, 60, 120 and 180 kg N/ha on a background of P2O5 60 kg/ha and K2O 60 kg/ha. Nitrogen uptake in wheat organs is mainly controlled by mineral fertilization. The share of influence reaches 36.15 percent for total biomass and 31.47 percent for nitrogen absorbed in grain. Increasing nitrogen rates leads to a decrease in the efficiency of nitrogen utilization from 45.07 to 34.85 kg grain per kg of nitrogen absorbed from total biomass. The type of predecessor also affects the nitrogen conversion capacity. The strongest negative effect is reported after the predecessor rapeseed.