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The Effect of Five Forage Species on Transport and Transformation of Atrazine and Isoxaflutole (Balance) in Lysimeter Leachate

^a Department of Agronomy, University of Missouri, Columbia, MO 65211
^b USDA Agricultural Research Service, Cropping Systems and Water Quality Research Unit, Columbia, MO 65211
^c Department of Math and Science, Alabama State University, Montgomery, AL 36106

View larger version (14K): [in a new window]   Fig. 1. Degradation pathway and chemical properties of isoxaflutole (IXF) and its metabolites (Beltran et al., 2000; Rhône-Poulenc, personal communication, 2000). The term Koc is the organic carbon partition coefficient.

View larger version (32K): [in a new window]   Fig. 2. Precipitation (mm) and leachate volume (L) collected from each ground cover treatment.

View larger version (20K): [in a new window]   Fig. 3. Cumulative total atrazine and isoxaflutole (IXF) lost to leachate.

View larger version (45K): [in a new window]   Fig. 4. Appearance of atrazine (ATR) and its metabolites deisopropylatrazine (DIA), deethylatrazine (DEA), and hydroxyatrazine (HA) in leachate over time.

View larger version (29K): [in a new window]   Fig. 5. Appearance of isoxaflutole (IXF) and its metabolites diketonitrile (DKN) and benzoic acid (BA) in leachate over time.

View larger version (17K): [in a new window]   Fig. 6. (A) Microbial biomass carbon versus atrazine degradation and (B) diketonitrile degradation to benzoic acid.