Index Catalog // ScholarsArchive@OSU

N processing in grass seed crops differing in soil drainage and disturbance in western Oregon, U.S.A.

Creator:: Nelson, Machelle A.
Abstract:: A better understanding of grass seed crop and soil fertility is necessary to improve fertilizer practices and preserving water quality in Willamette Valley, Oregon, where 55% of land-use is in grass seed production that directly impacts adjacent waterways containing native protected fish species. I determined tillage effects on soil N...
Resource Type:: Masters Thesis
Full Text:: : Stephen M. Griffith A better understanding of grass seed crop and soil fertility is necessary to improve

Role of a grass riparian zone in controlling the fate of nitrogen in a poorly drained agricultural landscape

Creator:: Davis, Jennifer H.
Abstract:: Riparian ecosystems, through their unique positions in the agricultural landscape, have the potential to mitigate nutrient loading to streams. This study was conducted to gain a better understanding of N cycling in a poorly drained Grass Riparian Zone (GRZ) and adjacent Perennial Ryegrass seed Field (PRF) in the Willamette Valley,...
Resource Type:: Dissertation

Community composition and activities of denitrifying bacteria in soils

Creator:: Rich, Jeremy J.
Abstract:: Few studies have directly compared denitrifying community composition and activities in soils by coupling molecular-genetic techniques and traditional measures of denitnfication. I investigated communities of denitrifying bacteria from adjacent meadow and forest soils in the Cascade Mountains, Oregon. A key gene in the denitrification pathway, N₂O reductase (nosZ), served as...
Resource Type:: Dissertation
Full Text:: : Stephen Giovannoni for giving career advice and influencing my Ph.D. instruction through two courses

Fatty acid profiling of soil microbial communities : a comparison of extraction methods and temporal dynamics in plant residue amended soils

Creator:: Fernandes, Marcelo Ferreira
Abstract:: A method based on fatty acid (FA) analysis is used to profile microbial community structure (MCS). Various extraction protocols are available, which alter the types of FAs extracted from soils. The more time consuming but widely used protocol extracts only FAs from phospholipids (PLFA). This technique is desirable because PLFAs...
Resource Type:: Dissertation
Full Text:: . David Myrold, Dr. Peter Bottomley, Dr. Stephen Giovannoni, and Dr. Dan Sullivan for being part of my

Nitrogen management and variety selection for dryland production of hard red winter wheat in northeastern Oregon

Creator:: Jepsen, Daniel R.
Abstract:: Proper nitrogen (N) management and variety selection are important for profitable hard red winter (HRW) wheat production in the dryland growing regions of northeastern Oregon. In these dryland systems, N management for grain yield and grain protein concentration (GPC) is challenging due to climatic and year-to-year variation in production environments....
Resource Type:: Masters Thesis

Bumble Bee (Hymenoptera: Apidae) Foraging Distance and Colony Density Associated With a Late-Season Mass Flowering Crop

Creator:: Rao, Sujaya and Strange, James P.
Abstract:: Foraging behaviors of bumble bee workers have been examined in natural habitats, whereas agricultural landscapes, which can provide insights on flight distances to fragmented patches of bloom, have received limited attention. In particular, information on worker flight distances to crops blooming several months after nests have been established is invaluable....
Resource Type:: Article
Full Text:: development (Rao and Stephen 2010). However, as the bumble bee nest is Þxed in location, access to themultiple

Phosphorus availability in biosolids-amended soils

Creator:: Choate, Jeff
Abstract:: Quantifying labile phosphorus (P) pools in biosolids is needed to manage biosolids for both agronomic and environmental purposes. Phosphorus indices originated in an effort to protect surface water quality from-non-point-agricultural P inputs. The objectives of this research were to: (1) evaluate soil test components of the western Oregon P index...
Resource Type:: Masters Thesis
Full Text:: throughout this process Tim Righetti, minor professor and supplier for all my GPS needs Stephen Schoenholtz

Cultural controls for suppressing Phytophthora cinnamomi root rot of blueberry

Creator:: Yeo, John R.
Abstract:: Phytophthora cinnamomi is a soilborne pathogen that causes root rot disease of highbush blueberry (Vaccinium corymbosum L.). When new installations of susceptible blueberry cultivars are infected with P. cinnamomi, plants often fail to grow significant new tissue, greatly reducing yields over the life of the planting. Chemical fungicides are available...
Resource Type:: Dissertation
Full Text:: . cinamomi requires a minimum of 20 oC soil temperature and also sufficient moisture (Roth and Kuhlman

Winter cover cropping effects on integrative biological indicators of soil quality

Creator:: Ndiaye, Evelyne L.
Abstract:: Responses of biological indicators of soil quality to winter cover cropping were measured on soil samples collected from 6 commercial growers' fields and two experiment research stations in the Willamette Valley of Oregon. The research stations were the North Willamette Research and Extension Center (Aurora, OR), and the Oregon State...
Resource Type:: Masters Thesis
Full Text:: -Sands, Cumbria, England. Bolton, J., L.F. Elliott, P.R. Papendick, and D.F. Bezdicek. 1985. Soil

Effects of winter cover crops following potato (Solanum tuberosum L.) on soil nitrate and soil fertility in the Columbia Basin

Creator:: Fernando, M.F. Sydney W.
Resource Type:: Dissertation

ScholarsArchive@OSU

N processing in grass seed crops differing in soil drainage and disturbance in western Oregon, U.S.A.

Role of a grass riparian zone in controlling the fate of nitrogen in a poorly drained agricultural landscape

Community composition and activities of denitrifying bacteria in soils

Fatty acid profiling of soil microbial communities : a comparison of extraction methods and temporal dynamics in plant residue amended soils

Nitrogen management and variety selection for dryland production of hard red winter wheat in northeastern Oregon

Bumble Bee (Hymenoptera: Apidae) Foraging Distance and Colony Density Associated With a Late-Season Mass Flowering Crop

Phosphorus availability in biosolids-amended soils

Cultural controls for suppressing Phytophthora cinnamomi root rot of blueberry

Winter cover cropping effects on integrative biological indicators of soil quality

Effects of winter cover crops following potato (Solanum tuberosum L.) on soil nitrate and soil fertility in the Columbia Basin

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