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Concentration of (A) Cd and (B) Si in the below-ground part of young maize plants grown hydroponically for 10 d and treated with Cd, Si or both elements together. C, control; Cd5, 5 µm Cd; Cd5 + Si, 5 µm Cd with 5 mm Si; Cd50, 50 µm Cd; Cd50 + Si, 50 µm Cd with 5 mm Si; Si, 5 mm Si. Values are means ± s.d. (n = 3). Different letters indicate significant differences among the treatments at P < 0·05 %.
