Fig. 5

Effect of sewage effluent (SE) on different varieties of canola shoot total soluble phenolics (A), root total soluble phenolics (B), shoot H₂O₂ (C), and root H₂O₂ (D). Significant differences were detected at (p < 0.05) using the Tukey test; different letters on the bars represent the means of four replicates with standard error.