Leaf area was most significantly affected by crop year and fertilisation, while genotype had a less notable impact. The highest leaf area (LAImax) values were obtained at the BBCH 61–69 (silking) and BBCH 71–77 (milk stage) phenophases (0.8–2.8 m2 m-2 in 2013 and 0.9–7.9 mm-2 in 2014, depending on the applied fertiliser doses and varieties).
The relative chlorophyll content (SPAD) was less affected by crop year and genotype, but it was significantly influenced by fertilisation. The highest SPAD values were obtained at the BBCH 30–37 (shooting) and the BBCH 61–69 (silking) phenophases of winter wheat (SPADmax values were between 29.6–49.7 in 2013 and 43.2–62.2 in 2014).
Pearson’s correlation analysis showed a close and significant correlation between the yield the different wheat varieties and their LAI (0.681**–0.802**), as well as between yield and SPAD readings (0.767**–0.893**).
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