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Phytoremediation of Aged Petroleum Sludge

Effect of Inorganic Fertilizer

^a Assistant Professor of Biological and Agricultural Engineering, Kansas State Univ., 147 Seaton Hall, Manhattan, KS 66507
^b Associate Professor of Civil Engineering, Purdue Univ., 1284 Civil Engineering Building, West Lafayette, IN 47907
^c Associate Professor of Agronomy, Purdue Univ., 1150 Lily Hall of Life Sciences, West Lafayette, IN 47907-1150

View larger version (20K): [in a new window]   Fig. 1. Electrical conductivity of leachate measured monthly from one replicate of each vegetation treatment averaged over fertilization rate

View larger version (21K): [in a new window]   Fig. 2. Leachate total petroleum hydrocarbon (TPH) concentrations measured monthly from one replicate of each vegetation treatment averaged over fertilization rate

View larger version (36K): [in a new window]   Fig. 3. Aboveground biomass (g) at 6 mo (A) and 12 mo (B). Error bars represent the standard deviation associated with each treatment. Least significant differences (P < 0.05) refer to comparisons of fertilizer treatments within a plant species [LSD0.05(fert)] and plant species within a fertilizer treatment [LSD0.05(veg)]

View larger version (38K): [in a new window]   Fig. 4. Root biomass determined after (A) 6 mo and (B) 12 mo growth. Error bars represent one standard deviation. At 6 mo, the species x fertilization least significant difference (LSD0.05) was 15.3 g. At 12 mo, LSD0.05 = 8.1 g

View larger version (35K): [in a new window]   Fig. 5. Bacterial colony forming units for 6 mo (A) and 12 mo (B) with statistical significance at 6 mo and 12 mo comparing vegetation treatments