Index Catalog // ScholarsArchive@OSU

Nitrogen available to winter wheat as influenced by previous crop in a moist xeric environment

Creator:: Qureshi, Maqsood Hassan
Abstract:: Rotating wheat with other crops is a common practice in the Willamette Valley of western Oregon. Depending upon previous crop and soil type, current N fertilizer recommendations for wheat in the Willamette Valley vary widely. Excessive fertilizer poses environmental risk, whereas lower N inputs than required by the crop represent...
Resource Type:: Dissertation
Full Text:: different crops on a variety of soils in the Willamette Valley of western Oregon. Nitrogen fertilizer

Effects of ryegrass residue management on Dayton soil organic carbon content, distribution and related properties

Creator:: Chapin, Michele F.
Abstract:: Total organic carbon, total nitrogen, microbial respiration and enzyme activity (β-glucosidase) were measured on several horizons of a Dayton silt loam (fine, montmorillonitic, mesic, Typic Albaqualf) soil cropped to annual ryegrass under two straw residue management systems. The study evaluated the effects of annual burning of straw residues or annual...
Resource Type:: Masters Thesis
Full Text:: modern phenomenon in the settlement of the Willamette Valley. Fire was used by the Native Americans to

Fertilizer nitrogen use efficiency by winter wheat in the Willamette Valley

Creator:: Kjelgren, Roger Keith
Abstract:: Efficiency of nitrogen fertilizer uptake by soft white winter wheat (Triticum aestivum L.) was measured over two cropping seasons across a range of soils and cropping histories in the Willamette Valley. Fate and potential losses of applied nitrogen were also assessed over a seventeen month period. In both cropping seasons,...
Resource Type:: Masters Thesis
Full Text:: , can contribute to improved N fertilizer recommendations for wheat in the Willamette Valley

Extraction and plant availability of cadmium and zinc in a Willamette sandy loam soil

Creator:: Halvorson, Gary Alfred
Abstract:: A Willamette sandy shot loam was treated with ZnC1₂, CdC1₂, or sewage sludge to determine the chemical fate of added Cd and Zn in the soil and their influence on the growth of corn and wheat seedlings. Cadmium was added as CdC1₂ at rates of 0, 5, 20, or 80...
Resource Type:: Dissertation
Full Text:: WILLAMETTE SANDY LOAM SOIL by Gary Alfred Halvorson A THESIS Submitted to Oregon State University in

Geochemical characteristics of iron-manganese nodules in seasonally-saturated soils of the Willamette Valley, Oregon

Creator:: Seter, Lisa M.
Abstract:: This study was initiated to characterize the distribution of Fe-Mn nodules and to elucidate trends of Fe, Mn, and P relative to the intensity of the annual cycles of reduction and oxidation. Nodules were enriched in Fe, Mn, and P relative to the soil matrix making them an integral part...
Resource Type:: Masters Thesis
Full Text:: seasonally-saturated soils of the Willamette Valley, Oregon AN ABSTRACT OF THE THESIS OF Lisa M. Seter for

Evaluation of soil and plant analyses as components of a nitrogen monitoring program for silage corn

Creator:: Marx, Ernest S.
Resource Type:: Masters Thesis
Full Text:: Willamette Valley of western Oregon during a two year period (1993-1994). Twenty-three of the experiments

Soil quality dynamics in an integrated reduced-tillage and cover-cropped vegetable agroecosystem

Creator:: Banners, Candace R.
Abstract:: Soil response and function were investigated following the adoption of an integrated reduced-tillage and cover-cropped vegetable system in the Willamette Valley of Western Oregon. The experiment was conducted over three cropping seasons (2002-2004) at the Oregon State University Vegetable Research Farm (Corvallis, OR). The design was a randomized complete-block with...
Resource Type:: Masters Thesis
Full Text:: and cover-cropped vegetable system in the Willamette Valley of Western Oregon. The experiment was

Determinants of microbial community structure and substrate utilization potential in soils of vegetable cropping systems

Creator:: Schutter, Mary E.
Abstract:: The Oregon Long-Term Soil Quality Project was initiated to identify soil properties that respond rapidly to alternative management practices. Such practices included winter cover cropping, which was implemented at two experimental research stations and several grower fields throughout the Willamette Valley. The goal of this thesis was to identify the...
Resource Type:: Dissertation
Full Text:: the Willamette Valley. The goal of this thesis was to identify the major impacts of cover cropping on

Aggregation, bulk density, compaction, and water intake responses to winter cover cropping in Willamette Valley vegetable production

Creator:: Buller, Gilbert L.
Abstract:: Many agricultural sustainability issues are related to biological processes which are central to the ecological function of soils. Soil physical properties are the architecture in which these processes are carried out. Cover crops hold promise as one of the techniques which can ameliorate poor soil structure and improve bulk density...
Resource Type:: Masters Thesis

Land use distributions and changes in the Willamette Valley in relation to soil characteristics

Creator:: Wiens, John Herbert
Abstract:: A study was undertaken in the Willamette Valley, Oregon, to document 1971 land use patterns as well as land use change in a smaller study area in the 16 years prior, and to relate these to soil characteristics. Quantification of these inter-relationships was aided by use of computer tabulation and...
Resource Type:: Dissertation
Full Text:: photointerpretive factors to mapping land use and cover classes in the Willamette Valley, Oregon. 113 7 1971 land

ScholarsArchive@OSU

Nitrogen available to winter wheat as influenced by previous crop in a moist xeric environment

Effects of ryegrass residue management on Dayton soil organic carbon content, distribution and related properties

Fertilizer nitrogen use efficiency by winter wheat in the Willamette Valley

Extraction and plant availability of cadmium and zinc in a Willamette sandy loam soil

Geochemical characteristics of iron-manganese nodules in seasonally-saturated soils of the Willamette Valley, Oregon

Evaluation of soil and plant analyses as components of a nitrogen monitoring program for silage corn

Soil quality dynamics in an integrated reduced-tillage and cover-cropped vegetable agroecosystem

Determinants of microbial community structure and substrate utilization potential in soils of vegetable cropping systems

Aggregation, bulk density, compaction, and water intake responses to winter cover cropping in Willamette Valley vegetable production

Land use distributions and changes in the Willamette Valley in relation to soil characteristics

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