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Herbicide Loading to Shallow Ground Water beneath Nebraska's Management Systems Evaluation Area

^a Dep. of Agronomy and Horticulture, Univ. of Nebraska, Lincoln, NE 68583-0915
^b Dep. of Biological Systems Engineering, Univ. of Nebraska, Lincoln, NE 68583-0726
^c Water Sciences Laboratory, Univ. of Nebraska, Lincoln, NE 68583-0844
^d School of Natural Resource Sciences, Univ. of Nebraska, Lincoln, NE 68583-0759
^e Dep. of Agronomy, USDA-ARS, Univ. of Nebraska, Lincoln, NE 68583-0934

View larger version (22K): [in a new window]   Fig. 1. Location of the Nebraska Management Systems Evaluation Area (MSEA) within the nonpoint-source nitrate and atrazine ground water contamination zone.

View larger version (52K): [in a new window]   Fig. 2. Layout of research–demonstration site and sampling locations.

View larger version (33K): [in a new window]   Fig. 3. Average atrazine, atrazine degradate (DEA, deethylatrazine; DIA, deisopropylatrazine), and metolachlor concentrations in shallow ground water (1.5 m) downgradient of the three corn management fields.

View larger version (38K): [in a new window]   Fig. 4. Average molar ratio of deethylatrazine to atrazine (DAR) in the shallow ground water (1.5 m) downgradient of the corn management fields.

View larger version (38K): [in a new window]   Fig. 5. Seasonal concentrations of atrazine, atrazine degradates (DEA, deethylatrazine; DIA, deisopropylatrazine), and metolachlor in shallow ground water (1.5 m) downgradient of the four management fields.

View larger version (36K): [in a new window]   Fig. 6. Atrazine, atrazine degradate (DEA, deethylatrazine; DIA, deisopropylatrazine), and metolachlor concentrations in the shallow ground water (1.5 m) upgradient of the research–demonstration site.

View larger version (21K): [in a new window]   Fig. 7. (a) Average molar ratio of deisopropylatrazine to deethylatrazine (D2R) and (b) regression analysis of deisopropylatrazine (DIA) and deethylatrazine (DEA) concentrations in the shallow ground water (1.5 m) downgradient of the corn management fields.