Index Catalog // ScholarsArchive@OSU

Impact of a red clover winter cover crop on carbon and nitrogen mineralization by microorganisms in soil aggregates

Creator:: Ndiaye, Aissatou
Abstract:: Although legumes have been widely studied for their nitrogen-fixing ability, it is uncertain to what extent legume cover crops achieve their nitrogen-fixing potential under the climatic conditions encountered in western Oregon. Furthermore, it is unknown what factors control the proportions of legume cover crop N that are either sequestered into...
Resource Type:: Masters Thesis
Full Text:: to the N requirements of the following summer crop. Soil was sampled in mid-September 1997, after

Nitrate and water under terraced dryland wheat production in Oregon

Creator:: Strock, Jeffrey S.
Abstract:: Dry land agriculture using summer fallow is a common crop production practice in the Columbia Plateau region of eastern Oregon. Farmed-over level terraces are used to control surface water runoff and soil erosion. More than 70 percent of the average annual precipitation around Pendleton, Oregon (350 - 400 mm) falls...
Resource Type:: Masters Thesis
Full Text:: in Oregon. Abstract approved: Benno P. Warkentin Dry land agriculture using summer fallow is a

Monitoring potato leafroll virus movement in differentially aged potato (Solanum tubersom L.) plants with an immunosorbent direct tissue blotting assay

Creator:: Whitworth, Jonathan L.
Abstract:: Potato leafroll virus (PLRV) causes yield and quality losses in potato. PLRV is identified by plant symptoms and serological tests such as an enzyme-linked immunosorbent assay (ELISA). A similar serological test, direct tissue blotting assay (DTBA), was used to detect and monitor PLRV movement in field-inoculated Russet Burbank plants and...
Resource Type:: Dissertation
Full Text:: tests of summer-infected tubers approximated those of ELISA and visual inspections. Indirect DTBA

Performance of perennial ryegrass (Lolium perenne L.) seed crops under water stress conditions

Creator:: Velloza, Theodosius Marmaduke
Abstract:: Summer drought is a major factor limiting the regrowth of perennial ryegrass seed crops. This phase of crop development has a strong influence on seed yield because most of the tillers that contribute towards next season's seed crop are produced or regrown during this period. In recent years many seed...
Resource Type:: Dissertation
Full Text:: important adaptive response for summer survival (McWilliam and Kramer, 1968). Extremely dry summers as

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:: sites compared winter cover crops or winter fallow in rotation with a summer vegetable crop. In one on

Vernalization requirement studies with Pacific Northwest wheats

Creator:: Baloch, Dost M.
Abstract:: Vernalization plays a fundamental role in the adaptation of winter cereals to their growing environment by controlling their growth habit, thereby allowing them to escape cold injury. Because of the climatic conditions of the region, dry summers and wet winters, growers sometimes cannot plant all of their winter wheat in...
Resource Type:: Masters Thesis
Full Text:: them to escape cold injury. Because of the climatic conditions of the region, dry summers and wet

Long-term effects of tillage, nitrogen, and rainfall on winter wheat yields

Creator:: Camara, Kelli Marie
Abstract:: Winter wheat is commonly grown in dryland cropping systems in the Pacific Northwest region of semi-arid eastern Oregon. For agronomic, economic, and environmental reasons, it is important to understand the long-term sustainability of such dryland systems. The objective of this study was to evaluate the long-term effects of tillage, nitrogen...
Resource Type:: Masters Thesis
Full Text:: research experiments in the western United States. The experiment consisted of a winter wheat-summer

Producing fiber flax using modern machinery and field retting

Creator:: Kennedy, Ralph C.
Abstract:: Fiber flax (Linum usitatissimum L.) production in the Willamette Valley ended in Oregon around 1957 before newly developed technology and fiber cultivars were available. The purpose of this research was to explore the use of modern methods and new cultivars. Field studies were conducted to evaluate cultivars and optimum cultural...
Resource Type:: Masters Thesis
Full Text:: rainy periods during summer-like weather (Sultana, 1988). To take advantage of early summer

A comparative analysis of stream response to disturbance in the Pacific Northwest

Creator:: Hodgins-Carlson, Terry Anne
Abstract:: Published literature about six Pacific Northwest stream systems was contrasted to provide a regional perspective on channel response to disturbance. This investigation was prompted by a combination of recent environmental legislation, mounting social pressures to plan projects at a drainage basin scale, and the difficulty in defining and predicting the...
Resource Type:: Masters Thesis

Nitrogen dynamics in western Oregon perennial grass pastures fertilized with dairy manure

Creator:: Baumeister, Nancy C.
Resource Type:: Masters Thesis
Full Text:: J. A. Hensen and K. Hendriksen (ed.) Nitrogen in organic wastes applied to soils. Academic Press

ScholarsArchive@OSU

Impact of a red clover winter cover crop on carbon and nitrogen mineralization by microorganisms in soil aggregates

Nitrate and water under terraced dryland wheat production in Oregon

Monitoring potato leafroll virus movement in differentially aged potato (Solanum tubersom L.) plants with an immunosorbent direct tissue blotting assay

Performance of perennial ryegrass (Lolium perenne L.) seed crops under water stress conditions

Winter cover cropping effects on integrative biological indicators of soil quality

Vernalization requirement studies with Pacific Northwest wheats

Long-term effects of tillage, nitrogen, and rainfall on winter wheat yields

Producing fiber flax using modern machinery and field retting

A comparative analysis of stream response to disturbance in the Pacific Northwest

Nitrogen dynamics in western Oregon perennial grass pastures fertilized with dairy manure

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