Comparison of the Performance of C. afer Plant at Different Ages over Time in Crude Oil-Contaminated Soil (in terms of TMAH reduction). 【T₁ = 1 week old, T₂ = 2 weeks old, T₃ = 3 weeks old, T₄ = 4 weeks old, T₅ = 5 weeks old, and T₆ = 6 weeks old Plants; C₁ = Low Contamination Level; C₂: Medium Contamination Level; C₃: High Contamination Level; C₄: Medium Contamination without Treatment (Control); Error bars on chart are percentage】.