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Herbicides in Ground Water beneath Nebraska's Management Systems Evaluation Area

^a Dep. of Agronomy and Horticulture, Univ. of Nebraska, Lincoln, NE 68583-0915
^b School of Natural Resource Sciences, Univ. of Nebraska, Lincoln, NE 68583-0759
^c Water Sciences Laboratory, Univ. of Nebraska, Lincoln, NE 68583-0844

View larger version (29K): [in a new window]   Fig. 1. Location of the Nebraska Management Systems Evaluation Area (MSEA) and layout of research–demonstration site and sampling locations.

View larger version (22K): [in a new window]   Fig. 2. Atrazine, atrazine transformation products (DEA, deethylatrazine; DIA, deisopropylatrazine), and metolachlor concentrations in the (a) shallow (1.5 m) and (b) deep (>6 m) ground water of the unconfined aquifer downgradient of the corn management fields.

View larger version (27K): [in a new window]   Fig. 3. Profiles of atrazine, atrazine transformation products (DEA, deethylatrazine; DIA, deisopropylatrazine; DDA, didealkylatrazine), and metolachlor in the unconfined aquifer and ground water ages, spring 1993. [Ages are from Spalding et al. (2001).]

View larger version (22K): [in a new window]   Fig. 4. Profiles of commonly detected triazine and acetamide herbicides and their metabolites in the unconfined aquifer, fall 1997. DEA, deethylatrazine; DIA, deisopropylatrazine; ESA, ethane sulfonic acid.