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- W1985397621 abstract "The objectives were to determine how atrazine (2-chloro-4-(ethylamino)-6-(isopropylamino)-s-triazine), dicamba (3-6-dichloro-2-methoxybenzoic acid), and 2,4-D (2,4-dichlorophenoxy-acetic acid) move through claypan soils (fine montmorillonitic, mesic Udollic Ochraqualf Mollic albaqualf, Mexico silty loam) at the Missouri Management System Evaluation Area (MSEA) near Centralia in Boone County, Missouri, and the role of preferential flowpaths in that movement. Twelve intact soil cores (30 cm diameter by 40 cm height), were excavated sequentially, four from each of the following depths: 0–40 cm, 40–80 cm, and 80–120 cm. These cores were used to study preferential flow characteristics using dye staining experiments and to determine hydraulic properties. Six undisturbed experimental field plots, with a 1 m2 surface area (two sets of three each), were instrumented at the Missouri MSEA on 11 May 1991: 1 m2 zero-tension pan lysimeters were installed at 1.35 m depths in Plots 1–3 and at 1.05 m depths in Plots 4–6. Additionally, each plot was planted with soybeans (Glycine max L.) and instrumented with suction lysimeters and tensiometers at 15 cm depth increments. A neutron probe access tube was installed in each plot to determine soil water content at 15 cm intervals. All plots were enclosed with a raised frame (of 8 cm height) to prevent surface runoff, and were allowed to equilibrate for a year before data collection. During this waiting period, all suction and pan lysimeters were purged monthly and were sampled immediately prior to herbicide application in May 1992 to obtain background concentrations. Atrazine, 2,4-D, and dicamba moved rapidly through the soil, probably owing to the presence of preferential flowpaths. Staining of laboratory cores showed a positive correlation between the per cent area stained by depth and the subsequent breakthrough of Br− in the laboratory and leaching of field-applied herbicides owing to large rainfall events. Suction lysimeter samples in the field showed increases in concentrations of herbicides at depths where laboratory data indicated greater percentages of what appeared to be preferential flowpaths. Concentrations of atrazine, 2,4-D, and dicamba exceeding 0.50, 0.1, and 0.15 μg ml−1 were observed with depth (45–135 cm, 60–125 cm and 60–135 cm) after several months following rainfall events. Preferential flowpaths were a major factor in transport of atrazine, 2,4-D, and dicamba at the site." @default.
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- W1985397621 date "1995-03-01" @default.
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- W1985397621 title "Transport of atrazine, 2,4-D, and dicamba through preferential flowpaths in an unsaturated claypan soil near Centralia, Missouri" @default.
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- W1985397621 doi "https://doi.org/10.1016/0022-1694(94)02603-9" @default.
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