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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

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:: . Christensen Rotating wheat with other crops is a common practice in the Willamette Valley of western Oregon

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

Residue management and yield characteristics of fine fescue seed crops

Creator:: Schumacher, Derek David
Abstract:: Chewings fescue [Festuca rubra L. subsp. fallax (Thuill.) Nyman] is a desired turfgrass with dense sod forming capabilities and superior shade tolerance. Thermal residue management (open-field burning) has traditionally been used to remove post-harvest residue and maintain seed yield over the life of the stand. However, alternative non-thermal residue management...
Resource Type:: Masters Thesis
Full Text:: -harvest residue management of fine fescue seed crops in the Willamette Valley has consisted of open-field

Spring irrigation management of tall fescue (Festuca arundinacea Schreb.) seed crops

Creator:: Orthel, Krista D.
Abstract:: Later maturing cultivars and increased ability to apply irrigation have led to inquiries by producers about proper irrigation management in tall fescue (Festuca arundinacea Schreb.) seed crops. The literature reveals little information about irrigation of perennial grass seed crops in general, and none about tall fescue in particular. Willamette Valley...
Resource Type:: Masters Thesis
Full Text:: fescue in particular. Willamette Valley producers need research-based information on which to base

Soil quality assessment of Willamette Valley soils and root colonization potential by arbuscular mycorrhizal fungi

Creator:: Allen, Natalie M.
Abstract:: Interest in measuring soil quality continues to increase worldwide in view of demands on land productivity and the necessity to preserve soil resources, yet identification of suitable indicators for soil quality assessment is still evolving. This study adapted 10 biological, physical, and chemical indicators of soil quality identified by the...
Resource Type:: Masters Thesis
Full Text:: agricultural soils in the south Willamette Valley, Oregon, USA. Soil samples from 102 sites were tested for

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:: Willamette Valley ended in Oregon around 1957 before newly developed technology and fiber cultivars were

ScholarsArchive@OSU

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

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

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

Residue management and yield characteristics of fine fescue seed crops

Spring irrigation management of tall fescue (Festuca arundinacea Schreb.) seed crops

Soil quality assessment of Willamette Valley soils and root colonization potential by arbuscular mycorrhizal fungi

Producing fiber flax using modern machinery and field retting

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