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Ecology Publications & Forms |
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Ecology Publications & Forms |
| Title | 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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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 (Number of pages: 1) (Publication Size: 1846KB)
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| Author(s) | Carey, B., C. Pitz, and J. Harrison (WSU) | ||||
| Description | The Department of Ecology used field results from a 5-year nitrogen (N) budget study at a manured grass field in northwest Washington to test a mass balance mixing box spreadsheet model that quantitatively predicts the impact of excess N on underlying shallow groundwater nitrate concentrations. Despite copious data for N mass balance components, soil conditions, and hydrogeologic conditions, the mass balance-predicted groundwater nitrate-N concentration was only 30% of the average field-measured early winter groundwater concentration. On the other hand, the nitrate concentration predicted, based on post-harvest soil nitrate, was 221% of that measured in the field and also a poor predictor of early winter shallow groundwater nitrate. Neither surrogate provided reliable predictions of the groundwater quality response to land application of nutrients at this site. |
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The mission of the Department of Ecology is to protect, preserve, and enhance Washington’s environment. To help us meet that goal, please consider the environment before you print or request a copy.
ADA Accessibility The Department of Ecology is committed to providing people with disabilities access to information and services by meeting or exceeding the requirements of the Americans with Disabilities Act (ADA), Section 504 and 508 of the Rehabilitation Act, and Washington State Policy #188. Visit Ecology’s website for more information. |
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| Contact | Barbara Carey at 360-407-6769 or bcar461@ecy.wa.gov | ||||
| Keywords | leaching, mass balance, soil nitrate, nitrate, manure, groundwater | ||||
| WEB PAGE | Groundwater Assessment in Washington State | ||||
| RELATED PUBLICATIONS | Title:
Spreadsheet Models for Determining the Influence of Land Applications of Fertilizer on Underlying Groundwater Nitrate Concentrations Nitrogen Dynamics at a Manured Grass Field Overlying the Sumas-Blaine Aquifer in Whatcom County |
Copyright © Washington State Department of Ecology. See https://ecology.wa.gov/About-us/Accountability-transparency/Our-website/Copyright-information.
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