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Effect of cadmium on dry weight of 17-week-old Merwilla plumbea plants grown for 4 weeks in perlite. Three different treatments were used: control (C); 1 mg Cd L−1 (Cd1); and 5 mg Cd L−1 (Cd5). Means ( ± s.e.) with different letters are significantly different (P < 0·05).
