The lowest dose of fertiliser (A60) increased the yield of the hybrid Armagnac by 43% and the yield of the hybrid Fornad by 35% on average over the years compared to the control treatment. The 120 kg N ha-1 base treatment caused an additional 49% increase in yield on average compared to the 60 kg N ha-1 basal treatment. A positive correlation between relative chlorophyll content and yield was demonstrated. As the phenophases progressed, different levels of correlation were found between crop years and genotypes. In the Armagnac hybrid, SPAD values measured in both years in the R3 phenophase had the most significant effect on yield development (r=0.84; r=0.80). In the Fornad hybrid, the strongest correlation was observed in the R1 phenophase in 2020 and in the V12 phenophase in 2021 (r=0.87; r=0.79).
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