Index Catalog // ScholarsArchive@OSU

Diclofop in runoff from agricultural watersheds in a high winter rainfall zone

Creator:: Hickman, John Spencer
Abstract:: Diclofop-methyl [me yl 2-(4-(2,4-dichlorophenoxy) phenoxy) propanoate] hydrolysis, degradation, and leaching were studied in field and laboratory experiments. Greater than 75% of the applied diclofop-methyl hydrolyzed to diclofop in 2 days at 4°C, the prevailing soil temperature during western Oregon winters. Degradation beyond the diclofop molecule, also an active herbicide, was...
Resource Type:: Dissertation
Full Text:: environmental contamination resulting from their movement from treated areas. Much of this concern has been

Deposition and persistence of polynuclear aromatic hydrocarbons after slash burning clear-cut sites in Oregon

Creator:: Sullivan, Timothy Joseph
Abstract:: Research has been completed which identifies qualitatively and quantitatively the deposition, persistence and fate of polynuclear aromatic hydrocarbons (PNAH) on burned clear-cut sites in Oregon. Eight PNAH were identified and quantified in post-burn litter samples taken from four slash-burned sites. Deposition of lower molecular weight, 3-4 ring compounds was considerably...
Resource Type:: Dissertation
Full Text:: the environment as a result of man's activities constitutes a growing environmental concern. PNAH

Short-term fate of xenobiotic substances in pesticide deposits

Creator:: Bentson, Kenneth Paul
Abstract:: An experimental protocol to determine the effects of temperature and light on the dissipation of xenobiotic substances in pesticide deposits is presented. A factorial design laboratory experiment is used to develop isothermal models of the dissipation of compounds over time in authentic pesticide deposits on excised leaves arid glass microscope...
Resource Type:: Dissertation

Estuarine sediment controls on trace metal distributions

Creator:: Davies-Colley, Robert J.
Abstract:: Sediments are the major compartment in aquatic environments for many materials of toxic or nutrient concern. The lack of knowledge of the phase associations of toxic metals in sediments is the largest deficiency in our understanding of the environmental hazard posed by metal contamination. This study examined the sedimentary partitioning...
Resource Type:: Dissertation
Full Text:: understanding of the environmental hazard posed by metal contamination. This study examined the sedimentary

Environmental contaminants and ecology of bald eagles in southcentral Oregon

Creator:: Frenzel, Richard Wilmarth
Abstract:: Food habits and levels of organochlorine compounds, lead, and mercury in resident and wintering bald eagles were studied in southcentral Oregon and California, 1979-83. Food habits were assessed by examination of castings from winter communal roosts, identification of 2938 prey items found at nest sites and foraging areas, and observations...
Resource Type:: Dissertation
Full Text:: Title: Environmental Contaminants and Ecology of Bald Eagles in Southcentral Oregon Abstract approved

An economic evaluation of on-farm strategies for reduction of nitrate groundwater pollution : the case of irrigated production in the Columbia basin

Creator:: Johnson, Scott Lee
Abstract:: Technological advances in agricultural production over the past 40 years have contributed to the high standard of living enjoyed by many in the United States. Extensive use of chemicals to enhance yield and improve crop quality has played a major role in creating this highly productive U.S. agricultural system. Increased...
Resource Type:: Dissertation
Full Text:: chemical use has imposed some significant environmental costs. One environmental concern receiving

The geomorphic significance of log steps in forest streams of the Oregon Coast Range

Creator:: Marston, Richard A.
Abstract:: A log step develops when large woody debris extends across the active channel, creating a change in the water surface elevation as the stream spills over the log step. By forming a series of vertical falls, log steps reduce the amount of potential energy available for conversion to kinetic energy...
Resource Type:: Dissertation
Full Text:: material above high water level. Methods, costs, and environmental considerations of stream clean-out are

A comparison of selected analyses for estimating environmental variation in early generations and advanced lines of wheat (Triticum aestivum L. em thell)

Creator:: Khan, Noor-ul Islam
Abstract:: This investigation was motivated by the introduction of the new nearest neighbour analyses which reportedly provided a better control of soil gradients than conventional experimental methods. Three nearest neighbour analyses and six other analyses were compared with the completely randomized design or the randomized complete block design in reducing the...
Resource Type:: Dissertation
Full Text:: environmental variation in early generations and advanced lines of wheat (Triticum aestivum L. em thell) AN

Responses of forest understory plants to burial by volcanic tephra from Mount St. Helens, Washington

Creator:: Antos, Joseph A.
Abstract:: The effects of burial by tephra (volcanic aerial ejecta) on forest understory plants were examined northeast of Mount St. Helens, Washington, in the area where the 18 May 1980 eruption deposited tephra but did not destroy canopy trees. At six sites along a tephra depth gradient from 2-15 cm, understory...
Resource Type:: Dissertation
Full Text:: situations, understanding the vegetation without knowing its environmental history is difficult if not

The control and fate of enteric bacteria in the environment with particular emphasis on the factors influencing fecal indicator survival in waste storage facilities

Creator:: Crane, Stuart R.
Abstract:: The indiscriminate release of fecal bacteria to the environment can present a public health hazard when pathogenic species gain access to drinking and recreational water sources. The extent of bacterial contamination of surface and ground waters associated with animal production units and waste application areas seems largely dependent on the...
Resource Type:: Dissertation
Full Text:: Strategy To Reduce Bacterial Pollution In Shellfish Areas: A Case Study. Environmental Management. 10:41-51

ScholarsArchive@OSU

Diclofop in runoff from agricultural watersheds in a high winter rainfall zone

Deposition and persistence of polynuclear aromatic hydrocarbons after slash burning clear-cut sites in Oregon

Short-term fate of xenobiotic substances in pesticide deposits

Estuarine sediment controls on trace metal distributions

Environmental contaminants and ecology of bald eagles in southcentral Oregon

An economic evaluation of on-farm strategies for reduction of nitrate groundwater pollution : the case of irrigated production in the Columbia basin

The geomorphic significance of log steps in forest streams of the Oregon Coast Range

A comparison of selected analyses for estimating environmental variation in early generations and advanced lines of wheat (Triticum aestivum L. em thell)

Responses of forest understory plants to burial by volcanic tephra from Mount St. Helens, Washington

The control and fate of enteric bacteria in the environment with particular emphasis on the factors influencing fecal indicator survival in waste storage facilities

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