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Deep soil nitrogen survey, Lower Umatilla Basin, Oregon

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dc.contributor.advisor Warkentin, Benno
dc.creator del Nero, Zachary Augustus
dc.date.accessioned 2012-11-26T21:49:57Z
dc.date.available 2012-11-26T21:49:57Z
dc.date.copyright 1994-07-14
dc.date.issued 1994-07-14
dc.identifier.uri http://hdl.handle.net/1957/35247
dc.description Graduation date: 1995 en_US
dc.description.abstract Soils of 49 agricultural and 2 "native condition" sites in the Lower Umatilla Basin, Oregon were sampled for nitrate-nitrogen, ammonium-nitrogen, chloride, and pH beginning in Fall of 1992. Several sites were sampled in Spring and Fall 1993 in order to indicate movement or loss of residual soil nitrogen over time. This study was prompted by current concern over contamination of public drinking water supplies by nitrate and the designation of over 550 square miles of this region as a Ground Water Management Area. This study sought to identify links between agricultural management practices-primarily irrigation, fertilization, and crop rotation systems, and deep soil nitrate levels. Soil profiles were divided into 3 "management zones:" 0-3', 3-6', and beyond 6' in depth. These depths represent average rooting depths for the major agricultural crops of the study area. In general, the effective rooting depth of most area-crops does not extend beyond 6', therefore, it was determined that residual soil-nitrate found at this depth or beyond may be a potential source of ground water contamination if not managed correctly. Results of the study indicate that proper management of irrigation, fertilization, and cropping rotation can significantly reduce the potential for contaminating ground water. Deep soil nitrate levels under most agricultural fields were consistent with the concept that some loss of nitrate below the root zone is inevitable, however, this condition can be minimized through intensive crop management. This study concludes that responsible management of agriculture can minimize impacts on ground water, while providing quality food and fiber products to an ever-growing population. In addition, more research is needed in the area of crop physiology and response to intensively managed systems. Such research may provide insight into more efficient methods of crop production and environmental protection. en_US
dc.language.iso en_US en_US
dc.subject.lcsh Soils -- Nitrogen content -- Environmental aspects -- Oregon -- Umatilla River Watershed en_US
dc.subject.lcsh Nitrates -- Environmental aspects -- Oregon -- Umatilla River Watershed en_US
dc.subject.lcsh Groundwater -- Pollution -- Oregon -- Umatilla River Watershed en_US
dc.title Deep soil nitrogen survey, Lower Umatilla Basin, Oregon en_US
dc.type Thesis/Dissertation en_US
dc.degree.name Master of Science (M.S.) in Crop Science en_US
dc.degree.level Master's en_US
dc.degree.discipline Agricultural Sciences en_US
dc.degree.grantor Oregon State University en_US
dc.description.digitization File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR. en_US
dc.description.peerreview no en_us
dc.description.other Best scan available for appendices. Original is black and white. en_US

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