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Effect of Root Death and Decay on Dissipation of Polycyclic Aromatic Hydrocarbons in the Rhizosphere of Yellow Sweet Clover and Tall Fescue

^a Department of Soil and Water, Connecticut Agricultural Experiment Station, 123 Huntington Street, New Haven, CT 06511
^b School of Civil Engineering, Purdue University, West Lafayette, IN 47907
^c Department of Agronomy, Purdue University, West Lafayette, IN 47907

View larger version (25K): [in a new window]   Fig. 1. Application of glyphosate and soil sampling schedule.

View larger version (79K): [in a new window]   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.

View larger version (24K): [in a new window]   Fig. 3. Total polycyclic aromatic hydrocarbon (PAH) concentration as a function of root surface area using active tall fescue and yellow sweet clover treatments.

View larger version (25K): [in a new window]   Fig. 4. Total polycyclic aromatic hydrocarbon concentration as a function of root surface area using glyphosate-treated tall fescue and yellow sweet clover.

View larger version (27K): [in a new window]   Fig. 5. Relationship between root and shoot biomass of active tall fescue and yellow sweet clover.

View larger version (30K): [in a new window]   Fig. 6. Relationship between root biomass and root surface area of active tall fescue and yellow sweet clover.