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Nitrate and Chloride Loading to Groundwater from an Irrigated North-Central U.S. Sand-Plain Vegetable Field

W. Stites* and G.J. Kraft

Central Wisconsin Groundwater Center, 1900 Franklin St., Univ. of Wisconsin, Stevens Point, WI 54481



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Fig. 1. Location map and distribution of multilevel piezometers in the study field.

 


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Fig. 2. Schematic view of a multilevel piezometer. Sampling points are the 18 flexible tubes and the rigid "backbone," which forms the deepest point.

 


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Fig. 3. Arrival and downward movement of annual Cl pulse in one study field multilevel piezometer (MLP). Five snapshots are shown of 23 profiles constructed over the period. (See text.)

 


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Fig. 4. Idealized movement of recharge water and solutes beneath a region A in an irrigated field. Recharge water infiltrating at a given time descends as a plane through the vadose zone. After reaching the water table, its movement is predominantly horizontal but a downward component remains, which accounts for the tilt in V's vertical axis. Recharge originating between two dates occupies an oblique prism bracketed by elevations z1 and z2.

 





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The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
and Life Sciences Education
Soil Science Society of America Journal
Copyright © 2001 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.