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Effects of quick vs slow-release fertilizers on nitrate movement into groundwater following precipitation events
Samaniego, Hannah
Samaniego, Hannah
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2022-05
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This research investigated the effect of quick-release and slow-release fertilizers on the
transport of nitrate through the subsurface. The main focus of this study was studying nitrate
concentrations in subsurface water samples over time, particularly in the presence of overfertilization.
Evaluating nitrate movement allowed for assessment of the potential for
contamination of shallow groundwater systems. Rainfall data was also evaluated to see the
effects that precipitation had on nitrate concentration trends. Additionally, soil was studied to
evaluate nitrate soil water concentrations and organic matter content.
It was concluded that nitrate concentrations remained elevated above the Maximum
Contaminant Level (MCL) of 10 mg/L nearly a year after initial fertilizer applications for both
fertilizer types and moved past the rooting zone of plants. The data also suggested that fertilizer
plays a larger role on changes in nitrate concentrations than increased precipitation. The
conclusions of this study emphasize the need for fertilizer users to more fully understand their
soil and vegetation’s nutritional needs prior to fertilizer application. Over-fertilization can have
long term consequences, including the potential to pollute shallow groundwater systems.
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Thesis (M.S.)-- Wichita State University, College of Liberal Arts and Sciences, Dept of Geology, Earth, Environmental and Physical Sciences Program
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Wichita State University
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© Copyright 2022 by Hannah Samaniego
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