U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings
of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993,
Water-Resources Investigations Report 94-4015
 
Atrazine Transport Through Preferential Pathways
at the Missouri MSEA
by
James A. Tindall (U.S. Geological Survey, NRP, Denver, Colo.)
and William K. Vencill (Department of Agronomy, University of Georgia, Athens,
Ga.)
Abstract
Results of experiments at the Missouri Management System Evaluation
Area (MSEA) indicate that atrazine moved rapidly through
the soil, probably due to the presence of a large number of cracks
and macropores. Data also show that concentrations of atrazine
exceeding 0.50 µg mL-1 were observed with depth (45-135 cm)
after several months following heavy recharge events. It appears
that macropores were a major factor in atrazine transport
at the site. Agriculture practices designed to reduce surface
cracking (which will reduce access to macropores) and chemical
input could play a major role in lessening contamination
of ground water in the Midwest.
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