Index Catalog // ScholarsArchive@OSU

Decomposition of Brassicaceae Residue in the Willamette Valley

Creator:: Berry, Pete A.
Abstract:: An important inoculum source of Leptosphaeria maculans and L. biglobosa (syn Plenodomus spp.), the pathogens that cause black leg in Brassicaceae crops, is infected plant residues. The general acceptance of conservation tillage in the Willamette Valley, Oregon, USA, has enabled a build-up in the amount of residue on or near...
Resource Type:: Dissertation
Full Text:: and temperature treatments. Spring corresponds to 20% moisture at 18.3 C, summer had 13% moisture

Seedling recruitment of hairy nightshade and other summer annual weeds in irrigated row crops

Creator:: Peachey, Ronald Edward
Abstract:: This study evaluated the effects of tillage system, rotational tillage sequences, and winter seed burial depth on weed seedling recruitment in irrigated cropping systems. Notill (NT) planting of vegetable crops reduced emergence of hairy nightshade by 77 to 99% and Powell amaranth emergence from 50 to 87% compared to conventional...
Resource Type:: Dissertation
Full Text:: Recruitment of Hairy Nightshade and Other Summer Annual Weeds in Irrigated Row Crops Abstract approved

Annual Forages Differ in Response to Partial-Season Irrigation Deficit in Both Spring Seeded and Summer Seeded Cropping Systems

Creator:: Fan, Qianqian
Abstract:: Water scarcity during summer becomes a serious problem in the Pacific Northwest, threatening forage production provided to livestock. Annual forages show great potential in handling drought because of their flexibility in seeding date and short growing season, and can shift the production to periods of feed shortage and fill the...
Resource Type:: Masters Thesis
Full Text:: Seeded and Summer Seeded Cropping Systems. Abstract approved

Lithologic Controls on Soil Carbon Partitioning in the Alaskan Coastal Temperate Rainforest

Creator:: Fleiner, Julia H.
Abstract:: Coastal Temperate Rainforests of western North America are carbon dense ecological regions of great importance due to their high biological productivity and climatic conditions leading to the natural accumulation of soil organic carbon (SOC). Yet, the distribution of SOC remains understudied in the CTR environments, particularly in upland mineral soils,...
Resource Type:: Masters Thesis
Full Text:: to collect my samples in the summer of 2020. Without the help of David D’Amore, Diogo Spinola, and

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

Seed quality and plant establishment studies of seashore paspalum (Paspalum vaginatum Sw.)

Creator:: Baker, Stanley D.
Abstract:: Seashore paspalum (Paspalum vaginatum Sw.) is an important warm-season perennial turfgrass, known for its tolerance to salinity. Turfgrass is used for homes, municipalities, sod farms, resorts, and sports fields. Seashore paspalum has historically been planted in sub-tropical and tropical climates because of its heat tolerance. Seashore paspalum could become an...
Resource Type:: Dissertation
Full Text:: Valley (OWV) if summer temperatures increase because of climate change. Typically, seashore paspalum

ScholarsArchive@OSU

Decomposition of Brassicaceae Residue in the Willamette Valley

Seedling recruitment of hairy nightshade and other summer annual weeds in irrigated row crops

Annual Forages Differ in Response to Partial-Season Irrigation Deficit in Both Spring Seeded and Summer Seeded Cropping Systems

Lithologic Controls on Soil Carbon Partitioning in the Alaskan Coastal Temperate Rainforest

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

Seed quality and plant establishment studies of seashore paspalum (Paspalum vaginatum Sw.)

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