Index Catalog // ScholarsArchive@OSU

Creator:: Scherr, Melissa A.
Abstract:: The effect of anthropogenic disturbance on river systems is gaining attention, and concerns about the state of freshwater natural resources are increasing globally, as are efforts to restore habitat that has been degraded by disturbance. In rivers, non-point source pollution affects the physical characteristics of the habitat and the endemic...
Resource Type:: Dissertation
Full Text:: interacting environmental gradients in the Umatilla River, Northeastern Oregon……..……… 72 Abstract

Creator:: del Nero, Zachary Augustus
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....
Resource Type:: Masters Thesis
Full Text:: Deep soil nitrogen survey, Lower Umatilla Basin, Oregon AN

Creator:: Ogishi, Aya
Abstract:: The agriculture production system in the post-war United States is characterized as highly specialized and increasingly dependent on off-farm inputs. Although the US has traditionally supported agriculture with numerous government commodity programs such as target prices, nonrecourse loans, and deficiency payments, agriculture today is perceived as one of the major...
Resource Type:: Masters Thesis
Full Text:: Evaluation of Alternative Agricultural Resources Conservation Policies. Abstract approved: Stanley F

Creator:: Godwin, Derek C.
Abstract:: Small commercial and non-commercial animal enterprises (SCAEs) raise a few beef cows, horses, pigs, sheep, poultry, and other animals on a few acres. These enterprises are often located in suburban areas of watersheds and show potential for degrading water quality through to increased bacterial, nitrogen, and phosphorus concentrations. SCAEs implement...
Resource Type:: Masters Thesis
Full Text:: largest sub-watershed in the Tualatin River Basin located outside of Portland, Oregon. The Tualatin River

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

Creator:: Moberg, Dean P., Rambo, Neil L., and Washington County Soil and Water Conservation District (Or.)
Abstract:: Survey In 1995, the Washington County Soil & Water Conservation District interviewed 90 farmers in northwest Oregon's Tualatin River Basin, using a survey developed by the USDA - Natural Resources Conservation Service (NRCS) and Oregon State University (OSU) Extension Service. Crop rotations, yields, tillage, fertilizer and irrigation practices were recorded....
Resource Type:: Technical Report
Full Text:: Farm Effects on Runoff Quality in Oregon' s Tualatin River Basin Part

Creator:: Frentress, Jay
Abstract:: To better understand the impact of land use on stream nutrient export, a synoptic sampling of 57 sub-basins within the Willamette River basin was conducted during winter baseflow conditions (February 2009). I assessed whether stream dissolved organic carbon (DOC), NO₃⁻ and Cl⁻ and specific ultra-violet absorbance (SUVA) values were correlated...
Resource Type:: Masters Thesis

Creator:: Cross, Timothy L., Wood, Mary, and Oregon State University. Water Resources Research Institute
Abstract:: About one-third of the land in the Tualatin Basin is used for agricultural production (Miner, Scott, and Wood, 1994). The variety of crops produced includes grains, specialty seeds, vegetables, fruits, berries, and nursery corps. Cattle and hog enterprises are the most prevalent livestock operations in the area (measured by number...
Resource Type:: Technical Report
Full Text:: Agricultural Land in the Tualatin Basin, Orego n August 1995 A Publication of the : ♦ Oregon .rte Water

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