Fig. 2. Measured versus predicted Cd contents of (A) winter wheat, (B) sugar beet, and (C) potato. Predictions assume a passive uptake and are based on parameters either measured or taken from the literature; only sugar beet k_P was fitted. In each panel the modeling efficiency (EF) is given. The black open circle in (C) points to four potato samples with a particularly strong disagreement between model and measurement.