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Fig. 3. (a-c) Fe-nutritional status and leaf chlorophyll levels (SPAD values) of soil-grown barley plants at 28 days after sowing (DAS), depending on Fe supply and atmospheric CO₂ concentration. Bars represent means and standard errors. Different letters indicate significant differences at the P < 0.05 level. The dashed line symbolizes the average Fe concentration sufficient for average plant growth (Marschner, 1995).