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BI-MODAL SUBSURFACE TRANSPORT OF ATRAZINE AND BROMIDE AT THE FIELD SCALE
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Pp. 307-316 in Total Maximum Daily Load (TMDL) Environmental Regulations–II Proceedings of the 8-12 November 2003 Conference (Albuquerque, New Mexico USA), Publication Date 8 November 2003. .(doi:10.13031/2013.15576)
Authors: J. S. Tyner, W. C. Wright, and R. E. Yoder
Keywords: atrazine, groundwater, macropore flow, preferential flow, TMDL, tracer
Within a 10-ha field site, annual surface applications of atrazine were made to a 0.37-ha bermed
plot from 1999 to 2001, and a potassium-bromide tracer was applied in 1993 and 2000. The field
site includes an intensive network of 40 shallow monitoring wells, 12 deep monitoring wells, a
precipitation gauge, and a H-flume with an automated sampler to quantify and sample runoff. In
the spring of 2003, twenty-one continuous soil cores were collected to a depth of approximately
3.4 m and analyzed for atrazine, bromide, and water content. Using a mass balance approach, the
relative amounts of water transported from the site as runoff, subsurface plug-flow, and subsurface
preferential flow were calculated.