Index Catalog // ScholarsArchive@OSU

Response of Striga-susceptible and Striga-resistant sorghum genotypes to soil phosphorus and colonization by an arbuscular mycorrhizal fungus

Creator:: Leytem, Alicia B.
Abstract:: Striga, a genus of obligate parasitic weeds in the family Orobanchaceae, has been identified as the most important biological factor limiting agricultural productivity in sub-Saharan Africa. Germination of Striga seeds is triggered by strigolactone root exudates from host plants. Strigolactones also induce hyphal branching in arbuscular mycorrhizal (AM) fungi, which...
Resource Type:: Masters Thesis
Full Text:: Striga-susceptible and Striga-resistant Sorghum Genotypes to Soil Phosphorus and Colonization by an

Environmental constraints on the use of anion exchange membranes in dryland wheat

Creator:: Redman, Andrea Elizabeth
Abstract:: Lack of growing season precipitation and the temperate climate in north central Oregon pose challenges to growing spring wheat crops. Phosphate and sulfate fertilization can improve early growth of spring wheat in this region and soil testing aids in determining rates of fertilization. In this study, anion exchange membranes (AEM)...
Resource Type:: Masters Thesis

Chemical properties of soils related to seasonal fluctuations in exchangeable potassium

Creator:: Etter, Harold Mac Donald
Abstract:: Representative sites of the Dayton, Woodburn, Jory, Quillayute, Astoria, Willamette, Walla Walla, Deschutes, Laki and Owyhee soil series were investigated for seasonal changes in exchangeable potassium in air dry samples. No consistent seasonal variations were found which could be attributed to wetting and drying in the field. Cropping reduced the...
Resource Type:: Masters Thesis
Full Text:: relationship between clay content vs air dry or oven dry exchangeable K, especially for the soil Edina #32 in

Effect of iron redistribution in soils on cesium magnetometer surveys at the Oregon State University research dairy

Creator:: Rogers, Michael
Abstract:: Contamination events at Oak Creek, which runs through Oregon State University Research lands, prompted investigations into alternate transport mechanisms for moving liquid effluent from OSU Diary lands to Oak Creek. Magnetometer surveys conducted at the Diary identified magnetic signatures spatially associated with sub-surface locations of drain tiles, a 12-inch pipe,...
Resource Type:: Dissertation
Full Text:: magnitude of the Earth's magnetic field by 500 nT or more [11] Variations in soil iron content can produce

Remineralization of marine particulate organic matter

Creator:: Burkhardt, Brian Gary
Abstract:: Marine microorganisms play a significant role in the cycling of nutrients in the open ocean through production, consumption, and degradation of organic matter (OM). Carbon (C), nitrogen (N), and phosphorus (P) are essential ingredients in every known recipe for life. However, the cycling of each of these elements proceeds at...
Resource Type:: Masters Thesis
Full Text:: ). Carbon (C), nitrogen (N), and phosphorus (P) are essential ingredients in every known recipe for life

Assessing the role of reactive metal species in soil organic matter cycling using chemical imaging

Creator:: Keiluweit, Marco
Abstract:: Intimate associations with reactive metal species permanently protect soil organic matter (SOM) from microbial access and oxidation, contributing to the build-up of organic carbon (C) stocks in soils. It is increasingly recognized, however, that such associations can be reversible and that reactive metal species might even facilitate the oxidation of...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE DISSERTATION OF Marco Keiluweit for the degree of Doctor of Philosophy in Soil Science

Interactions between nitrogen, phosphorus, and molybdenum in forest soils and cyanobacterial lichen in the Oregon Coast Range

Creator:: Marks, Jade A.
Abstract:: Molybdenum is an essential component of biogeochemical cycling, most notably as a component of the nitrogenase enzyme used in biological nitrogen (N) fixation. While the important role of phosphorus (P) in limiting N fixation in ecosystems has been well documented, occurrence and prevalence of molybdenum (Mo) limitation is largely unknown....
Resource Type:: Masters Thesis
Full Text:: Soil Science presented on August 15, 2014. Title: Interactions between Nitrogen, Phosphorus, and

The short term temporal and spatial variability of nitrogen and phosphorus in two Oregon Coast Range streams

Creator:: Scherer, Robert A.
Abstract:: High intensity sampling was undertaken to characterize the temporal and spatial variability of oxidized nitrogen (NO3-N + NO2-N), ammonia-nitrogen (NH3-N), total dissolved phosphorus, total unfiltered phosphorus and orthophosphorus (PO4-P) from two adjacent small streams in Western Oregon's Coast Range, Deer Creek (303 ha) and Flynn Creek (203 ha). Deer Creek...
Resource Type:: Masters Thesis

Carbon fluxes across three climatically-distinct forest chronosequences in Oregon

Creator:: Campbell, John
Abstract:: Biometric and gas exchange techniques were used to measure soil respiration (soil surface CO₂ efflux) and NEP (Net Ecosystem Production) across three climatically-distinct forest chronosequences in Oregon. Results indicate significant forest type, age, and forest type x age interaction effects on annual soil respiration. A regional age class distribution skewed...
Resource Type:: Dissertation

Effects of 20 years of litter and root manipulations on soil organic matter dynamics

Creator:: Wig, Jennifer D.
Abstract:: Globally, the forestry sector is the second largest contributor of greenhouse gases, and sustainable forest management is a major target of international environmental policy. However, there is the assumption underlying many policy recommendations that an increase in above-ground carbon stocks correspond to long term increases in ecosystem carbon stocks, the...
Resource Type:: Masters Thesis
Full Text:: in soil respiration rates, probably due to decreases in moisture and organic matter content, but

ScholarsArchive@OSU

Response of Striga-susceptible and Striga-resistant sorghum genotypes to soil phosphorus and colonization by an arbuscular mycorrhizal fungus

Environmental constraints on the use of anion exchange membranes in dryland wheat

Chemical properties of soils related to seasonal fluctuations in exchangeable potassium

Effect of iron redistribution in soils on cesium magnetometer surveys at the Oregon State University research dairy

Remineralization of marine particulate organic matter

Assessing the role of reactive metal species in soil organic matter cycling using chemical imaging

Interactions between nitrogen, phosphorus, and molybdenum in forest soils and cyanobacterial lichen in the Oregon Coast Range

The short term temporal and spatial variability of nitrogen and phosphorus in two Oregon Coast Range streams

Carbon fluxes across three climatically-distinct forest chronosequences in Oregon

Effects of 20 years of litter and root manipulations on soil organic matter dynamics

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