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

Roy F. Spalding*,a, Mary E. Exnerb, Daniel D. Snowa, David A. Cassadac, Mark E. Burbachc and Stephen J. Monsonc

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



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Fig. 1. Location of the Nebraska Management Systems Evaluation Area (MSEA) and layout of research–demonstration site and sampling locations.

 


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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.

 


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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).]

 


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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.

 





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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
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Vadose Zone Journal
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