Spreadsheet Models for Determining the Influence of Land Applications of Fertilizer on Underlying Groundwater Nitrate Concentrations
Spreadsheet Models for Determining the Influence of Land Applications of Fertilizer on Underlying Groundwater Nitrate Concentrations (Number of pages: 49) (Publication Size: 1132KB)
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Note: Appendix E
|Description||Contamination of groundwater by nitrate is often found in close association with nonpoint applications of nitrogen-bearing fertilizers or animal manure to agricultural lands. Due to the risk that nitrate poses to state drinking water supplies, determining the proper balance between nutrient application rates, crop uptake, and nitrate loss to groundwater is a growing priority in Washington.
This report presents a set of three mass-balance spreadsheet computer models that can be used to quantitatively predict the impact of residual or excess farm-field soil nitrate on the concentration of nitrate in underlying shallow groundwater. All three models allow the user flexibility in defining site-specific model variables. Model assumptions and limitations are discussed.
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|Keywords||model, nitrate, fertilizer, groundwater|
|WEB PAGE||Groundwater quality assessment|
POSTER: Evaluation of field N budgets and soil nitrate as indicators of N leaching to groundwater in a Pacific Northwest U.S. dairy grass field
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