Index Catalog // ScholarsArchive@OSU

Nitrate leaching and model evaluation under winter cover crops

Creator:: Minshew, Hudson F.
Resource Type:: Masters Thesis
Full Text:: of Master of Science in Soil Science presented on November 11, 1998. Title: Nitrate Leaching and

Quantification of the nitrate attenuation capacity of low-permeability Missoula Flood deposits in the Willamette Valley of Oregon

Creator:: Arighi, Louis M.
Abstract:: Low-permeability geologic units may offer significant chemical and hydraulic protection of adjacent aquifers, and are important for managing groundwater quality, especially in areas with significant non-point source contamination. Nitrate in the Willamette Valley is attenuated across the Willamette Silt, a semi-confining unit overlying a regionally important aquifer. To quantify the...
Resource Type:: Masters Thesis
Full Text:: Survey, the Oregon Department of Environmental Quality, and ChevronTexaco. TABLE OF CONTENTS

Temporal and spatial variability of groundwater nitrate in the southern Willamette Valley of Oregon

Creator:: Mutti, Jeffrey Glenn
Abstract:: Groundwater nitrate contamination is a well-documented issue in the Southern Willamette Valley (SWV) of Oregon, as a Groundwater Management Area (GWMA) has recently been declared. As a GWMA, groundwater nitrate monitoring must occur until regional concentrations are below 7 mg/L NO3-N. However, the presence of temporal variability can make it...
Resource Type:: Masters Thesis
Full Text:: Oregon Abstract approved: Roy D. Haggerty Groundwater nitrate contamination is a well

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Creator:: Sobota, Daniel J.
Abstract:: Land use alters the physical and biological structure of stream ecosystems and potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in abundance on the biosphere during the past century from human activities. In this dissertation, I quantified uptake and transformation of nitrate (NO₃⁻)...
Resource Type:: Dissertation
Full Text:: . Title: Linkages among Land Use, Riparian Zones, and Uptake and Transformation of Nitrate in Stream

An eleven year study of nitrate leaching in vegetable production with winter cover crops

Creator:: Feaga, Jeff
Abstract:: The Willamette Valley of Oregon has high rates of winter precipitation that cause leaching losses of residual fertilizer nitrogen (N) as nitrate (NO₃). Cover crops may have potential to mitigate N loss. Shallow groundwater was sampled for 11 years from plots planted in summer vegetables with and without winter cover...
Resource Type:: Masters Thesis

Field measurements of nitrate leaching below Willamette Valley row and mint crops

Creator:: Oregon State University. Extension Service, Feaga, Jeff, and Selker, John S.
Abstract:: According to the United States Geological Survey, 9 percent of wells in the Willamette Valley exceed the EPA’s 10 ppm drinking water standard for nitrogen in the NO3– compound, or NO3–-N. A study of 281 domestic drinking water wells in Lane County showed that 22 percent of the wells exceeded...
Resource Type:: Technical Report
Full Text:: and Mint Crops, EM 8851 (Oregon State University Extension Service) Field Measurements of Nitrate

Chemical and isotopic patterns of nitrate variability in the southern Willamette Valley, Oregon

Creator:: Vick, Christopher Flanders
Abstract:: A relatively stable, persistent and historical problem with elevated NO₃⁻ concentrations in rural drinking wells in the southern Willamette Valley, Oregon is evident. What is the origin of NO₃⁻ in rural drinking water wells in this area? The answer to the question is not simple. Many non-point sources contribute to...
Resource Type:: Masters Thesis

Who's afraid of a little nitrate? : discovering impediments and incentives in following best management practices related to water quality within the southern Willamette Valley groundwater management area

Creator:: Rolston, Irene
Abstract:: Thesis summarizes interviews with growers residing within the Groundwater Management Area (GWMA) in the Southern Willamette Valley of Oregon. Informal and semi-structured interviews were used to identify perceived impediments and incentives perceived by local farmers in following best management practices related to water quality. Results from the interviews were coded...
Resource Type:: Masters Thesis
Full Text:: Area. Chapter One Introduction On May 10, 2004, the Oregon Department of Environmental Quality (DEQ

Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface

Creator:: Zarnetske, Jay P.
Abstract:: The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the amount of bioavailable N in the biosphere, which is causing increasingly frequent and severe impacts on ecosystems and human welfare. Streams are important features in...
Resource Type:: Dissertation
Full Text:: . Title: Hydrological and Biogeochemical Dynamics of Nitrate Production and Removal at the Stream

Analysis of Oregon's Domestic Well Testing Act data for use in a sentinel surveillance system for private well contaminants

Creator:: Hoppe, Brenda O.
Abstract:: The Safe Drinking Water Act ensures that public systems provide water that meets health standards. However, no such protection exists for millions of Americans who obtain water from private wells. Concern for safety is warranted as most wells draw from underground aquifers, and studies demonstrate that groundwater is affected by...
Resource Type:: Dissertation
Full Text:: – INTRODUCTION………………………………................. 1 Private Wells and Nitrate Contamination in Oregon………………… 8

ScholarsArchive@OSU

Nitrate leaching and model evaluation under winter cover crops

Quantification of the nitrate attenuation capacity of low-permeability Missoula Flood deposits in the Willamette Valley of Oregon

Temporal and spatial variability of groundwater nitrate in the southern Willamette Valley of Oregon

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

An eleven year study of nitrate leaching in vegetable production with winter cover crops

Field measurements of nitrate leaching below Willamette Valley row and mint crops

Chemical and isotopic patterns of nitrate variability in the southern Willamette Valley, Oregon

Who's afraid of a little nitrate? : discovering impediments and incentives in following best management practices related to water quality within the southern Willamette Valley groundwater management area

Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface

Analysis of Oregon's Domestic Well Testing Act data for use in a sentinel surveillance system for private well contaminants

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