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Plots for 40 genotypes grown at Rothamsted in 2015-16, showing (a) grain %N vs yield, (b) grain %N corrected for nitrogen and yield vs yield, (c) GPD vs yield corrected for impact of N-levels and (d) grain N vs N level. The 40 cultivars (rainbow color-coded) were grown at two N-levels: 150 kg/ha (open triangles), and 250 kg/ha (filled squares).
