Fig. 2. Polycyclic hydrocarbon degraders in soil after phytoremediation with yellow sweet clover and tall fescue. Soil was pretreated by land-farming. Error bars represent one standard deviation (n = 4). MPN, most probable number. TFG, tall fescue with glyphosate; TFA, active tall fescue; SCG, yellow sweet clover with glyphosate; SCA, active yellow sweet clover; UC, unvegetated control.