Index Catalog // ScholarsArchive@OSU

Phosphorus availability in biosolids-amended soils

Creator:: Choate, Jeff
Abstract:: Quantifying labile phosphorus (P) pools in biosolids is needed to manage biosolids for both agronomic and environmental purposes. Phosphorus indices originated in an effort to protect surface water quality from-non-point-agricultural P inputs. The objectives of this research were to: (1) evaluate soil test components of the western Oregon P index...
Resource Type:: Masters Thesis
Full Text:: of Master of Science in Soil Science presented on June 20, 2003. Title: Phosphorus Availability in

Influence of nitrogen and phosphorus on interference between medusahead and squirreltail

Creator:: Young, Kert R.
Abstract:: Restoration of invaded aridlands is required to reduce the exorbitant ecological and monetary losses related to noxious weeds. An understanding of how reduced and increased levels of soil N and P influence interference between medusahead and squirreltail is imperative to understanding how squirreltail may be used in restoration of medusahead...
Resource Type:: Masters Thesis
Full Text:: belowground biomass for 22 weeds increased with increased soil phosphorus (P), suggesting that P may

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

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

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

Estimating plant-available nitrogen release from manures, composts, and crop residues

Creator:: Gale, Eric S.
Abstract:: In order to properly utilize organic amendments as nitrogen sources, reliable methods to estimate plant-available nitrogen (PAN) are needed. The objectives of this study were to (1) evaluate the use of crop and soil responses in fertilizer N equivalence (FNE) calculations, (2) examine the relationships between the C/N ratio, total...
Resource Type:: Masters Thesis
Full Text:: Master of Science in Soil Science presented on September 17. 2004. Title: Estimating Plant-Available

Influences of nitrogen on carbon dynamics in forest soil and density fractions

Creator:: Swanston, Christopher W.
Abstract:: Application of N fertilizer is a common forest management practice in the Pacific Northwest, yet the long-term influence of fertilization on forest soil properties is not well known. Although elevated N often increases mineralization of C and N from labile organic matter, negative effects have been documented in recalcitrant organic...
Resource Type:: Dissertation

Post-harvest soil nitrate testing for manured cropping systems west of the Cascades

Creator:: Oregon State University. Extension Service, Sullivan, Dan M. (Dan Matthew), 1954-, and Cogger, Craig George, 1950-
Abstract:: This publication describes the use of post harvest soil nitrate testing as a tool for assessment of nitrogen (N) management in manured cropping systems west of the Cascade Mountains in Oregon, Washington, and south coastal British Columbia. The first section of this publication gives general information on the test and...
Resource Type:: Technical Report
Full Text:: a relationship between soil organic matter content and potential N mineralization? Research west of

Distinguishing biological and physical controls on soil respiration

Creator:: Phillips, Claire L.
Abstract:: Soil respiration, or the combined CO₂ emissions from roots and soil microorganisms, constitutes one of the largest losses of carbon (C) from terrestrial ecosystems. The major drivers of soil respiration, which include soil moisture, temperature, and substrate quality, have been known for some time. Nevertheless, correlations between these drivers and...
Resource Type:: Dissertation
Full Text:: October 23, 2009 Title: Distinguishing Biological and Physical Controls on Soil Respiration Abstract

Quantifying C and N contents and isotope signatures of SOM pools in the H. J. Andrews DIRT plots

Creator:: Keirstead, Heath
Abstract:: The mechanisms governing short- and long-term belowground carbon dynamics need to be understood. As part of a larger project developed to assess the effect of quantity and quality of litter inputs on the rate of soil organic matter (SOM) formation, I examined SOM in the H. J. Andrews Detritus Input...
Resource Type:: Masters Thesis
Full Text:: to the soil is much lower in nitrogen content than is needed by the respiring microbes. Plant leaves

ScholarsArchive@OSU

Phosphorus availability in biosolids-amended soils

Influence of nitrogen and phosphorus on interference between medusahead and squirreltail

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

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

Carbon fluxes across three climatically-distinct forest chronosequences in Oregon

Estimating plant-available nitrogen release from manures, composts, and crop residues

Influences of nitrogen on carbon dynamics in forest soil and density fractions

Post-harvest soil nitrate testing for manured cropping systems west of the Cascades

Distinguishing biological and physical controls on soil respiration

Quantifying C and N contents and isotope signatures of SOM pools in the H. J. Andrews DIRT plots

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