Index Catalog // ScholarsArchive@OSU

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:: Signatures of SOM poois in the H. J. Andrews DIRT plots. Abstract approved: Elizabeth W. S The mechanisms

Exploring Soil-Landscape Relationships on the Pacific Slope of Monteverde, Costa Rica

Creator:: Hesson, Kevin M.
Abstract:: Landscape positions have been used to determine soil properties. My soil study in Monteverde on the Pacific slope of Costa Rica was designed to examine soil-landscape relationships for sites with various land use histories and management. Soil pits were dug at Nacimiento y Vida, Crandell, Curi-cancha, La Calandria, and Finca...
Resource Type:: Masters Thesis
Full Text:: : _________________________ Ronald J. Reuter Landscape positions have been used to determine soil properties. My

DNA fingerprinting and genome mapping in meadowfoam

Creator:: Katengam, Sureeporn
Abstract:: Marker information in the new oilseed crop, meadowfoam, is limited. Molecular markers to facilitate meadowfoam breeding and cultivar improvement are not available. The knowledge of genetic relationships among recent germplasm is not known. The objectives of this study were (i) to gain an understanding of genetic diversity and relationship patterns...
Resource Type:: Dissertation
Full Text:: Steven J. Knapp Marker information in the new oilseed crop, meadowfoam, is limited. Molecular markers

Water management effects on birdsfoot trefoil seed production

Creator:: García-Díaz, Carlos Alberto
Abstract:: There is no information available on water management of birdsfoot trefoil grown for seed. Information is also not available describing how to minimize seed losses due to shattering in order to obtain consistently high birdsfoot trefoil seed yields. The objectives of this research are to: (i) quantify crop water use,...
Resource Type:: Dissertation
Full Text:: Privacy ACKNOWLEDGMENTS I would like to express my sincere gratitude to Jeffrey J. Steiner, my major

Duration of saturation and redox potentials in selected Willamette Valley soils

Creator:: Austin, Will
Resource Type:: Masters Thesis
Full Text:: molecules for each other (cohesion) than for the air around them (Brady, 1990). The contact angle is

Response of soil microbial communities to physical and chemical disturbances: implications for soil quality and land use sustainability

Creator:: Chaer, Guilherme M.
Abstract:: The objectives of this thesis were to evaluate the responses of soil microbial communities to physical and chemical disturbances, and associate these responses with soil functional stability and changes in soil quality. The first study consisted of application of heat shocks (HS) to soils with contrasting land use history to...
Resource Type:: Dissertation
Full Text:: Disturbances: Implications for Soil Quality and Land Use Sustainability Abstract approved: Peter J

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:: cooperation. I extend special thanks to Dr. R. Dick, Dr. D. Myrold and Dr. J Baham for their time

Symbiotic characteristics of Rhizobium leguminosarum bv. trifolii recovered from nodules of field-grown Trifolium subterraneum L.

Creator:: Wanjagi, Francis Ndung'u
Abstract:: In a series of greenhouse experiments, isolates representing serotypically distinct subpopulations of Rhizobium leguminosarum bv. trifolii recovered from root nodules of field-grown subclover Trifolium subterraneum cv. "Nangeela"), were evaluated for their symbiotic effectiveness potential, their effect on regrowth potential of subclover, and for their competitive abilities to form nodules. Isolates...
Resource Type:: Masters Thesis
Full Text:: of Field-grown Trifolium subterraneum L. Abstract Approved: Redacted for Privacy Peter J

Simple sequence repeat marker development and mapping in cultivated sunflower, Helianthus annuus L.

Creator:: Yu, Ju-Kyung
Abstract:: The cultivated sunflower (Helianthus annuus L., x=17) is one of the most important annual oilseed crops in the world. There are very few publicly shared sequence-based DNA markers and genetic maps in sunflower, even though molecular DNA markers and genetic maps have become widely used in all areas of genetic...
Resource Type:: Dissertation
Full Text:: J. Knapp The cultivated sunflower (Helianthus annuus L., x = 17) is one of the most important

The influence of phosphatase-producing bacteria on phosphatase activity and available phosphorus in soil

Creator:: Nelson, Sheila J.
Resource Type:: Masters Thesis
Full Text:: phosphatase activity and available phosphorus in soil AN ABSTRACT OF THE THESIS OF Sheila J. Nelson for the

ScholarsArchive@OSU

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

Exploring Soil-Landscape Relationships on the Pacific Slope of Monteverde, Costa Rica

DNA fingerprinting and genome mapping in meadowfoam

Water management effects on birdsfoot trefoil seed production

Duration of saturation and redox potentials in selected Willamette Valley soils

Response of soil microbial communities to physical and chemical disturbances: implications for soil quality and land use sustainability

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

Symbiotic characteristics of Rhizobium leguminosarum bv. trifolii recovered from nodules of field-grown Trifolium subterraneum L.

Simple sequence repeat marker development and mapping in cultivated sunflower, Helianthus annuus L.

The influence of phosphatase-producing bacteria on phosphatase activity and available phosphorus in soil

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