OSU Extension Service Groundwater & Agricultural Practices Research

Almost a decade of research is summarized in this series of publications.

• Coupling the dual isotopes of water (δ 2H and δ 18O) and nitrate (δ 15N and δ 18O): a new framework for classifying current and legacy groundwater pollution (pdf), March 24, 2021
• A Trend Analysis of Nitrate in the Southern Willamette Valley Groundwater Management Area (pdf) GWMA, Sept. 6, 2019
• Seasonality of nitrogen balances in a Mediterranean climate watershed, Oregon, US (pdf), May 31, 2018
• Nutrient Management for Sustainable Vegetable Cropping Systems in Western Oregon, EM 9165
• Nitrate leaching in current and past agricultural practices (pdf) SVWGWMA, June 30, 2015

• Field Measurements of Nitrogen Leaching Below Willamette Valley Row & Mint Crops, EM 8851

• Pesticides in Southern Willamette Valley Groundwater, EC 1565
• Groundwater and Nitrogen Management in Willamette Valley Mint Production, EM 8861
• Irrigation System Maintenance, Groundwater Quality, and Improved Production, EM 8862
• Why Should We Be Concerned with our Current Fertilizer Practices? Special Report 1050.

Graduate Students

View related graduate student research, such as publications, theses, presentations and posters by Oregon State University graduate students.

Nitrogen Budget Report

The Nitrogen/Nitrate Budget Report (pdf) details work to link public policy and planning with best available science and associated data. The project identifies potential sources of elevated levels of nitrate in drinking water in the Southern Willamette Valley Groundwater Management Area (SWVGWMA). A better understanding of the quantities of nitrogen applications and potential nitrate contributions, provide a tool to help guide future choices in land use management practices.

USGS

Linking Groundwater Age and Chemistry Data to Determine Redox Reaction Rates and Trends in Nitrate Concentrations in Agricultural Areas (pdf) USGS, April 22, 2010

2010 Agriculture Workshop

The Agricultural Research and Demonstration Needs Workshop had a focus on agricultural research, implementation and funding needs to address water quality issues in the Southern Willamette Valley. View workshop summary and presented materials.

Databases

DEQ maintains a searchable Water Quality Database. View the data portal with instructions.