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The use of treated wastewaters in the fertilization for agriculture is increasing, and with it are potential impacts on ground-water quality. In the area of Dodge City, Kansas, which consists of silty clay loam soils, treatments have resulted in elevated nitrate-nitrogen concentrations (10-50 mg/kg) throughout the upper soil profile. Variable concentrations of soil-nitrate suggest that preferential flow processes have occurred at the area. Observation of macropores at depths up to 15-m below the surface and indicated by dye tracing done at two of the sites supports this perspective. Cores taken during previous studies in the area show nitrate-N values of 30 mg/L, converted from soil mg/kg values, at depths of up...
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There is concern that the use of treated wastewater south of Dodge City, Kansas, which consists of mainly silty clay loam soils, has resulted in high nitrate-nitrogen (N) concentrations (10-50 mg/kg) in the subsurface upper 15-m vadose zone, and also in the underlying deep (20-45 m) ground water. The goal of this two-year field monitoring project was to assess how and under what circumstances N nutrients under secondary-treated wastewater-irrigated corn can reach the deep ground water of the underlying High Plains aquifer, and what can realistically be done to minimize this problem. We collected deep cores for physical and chemical properties characterization; installed neutron moisture probe access tubes and suction...
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