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Effects of N supply and genotypic variability on agronomic components and grain quality traits (A) and principal component analysis (B) in four varieties of field-grown durum wheat (Kiko Nick, Don Ricardo, Euroduro, and Haristide) at two N levels (control vs. low N). In (A), the different letters differ statistically (*, p < 0.05; **, p < 0.01; ***, p < 0.001). The abbreviations are described in Supplementary Table 1.
