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Cover crop effect on soil microbial biomass after fumigation in potato fields in the Columbia Basin

Creator:: Kim, Esther
Abstract:: In the Columbia Basin, pre-plant soil fumigation is commonly used in potato production for pest control, but fumigation can kill non-target organisms within the soil, result in unintended shifts in the microbial community, and disrupt long-term soil health. Cover crops have been shown to strongly influence the numbers and communities...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Esther Kim for

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

N processing in grass seed crops differing in soil drainage and disturbance in western Oregon, U.S.A.

Creator:: Nelson, Machelle A.
Abstract:: A better understanding of grass seed crop and soil fertility is necessary to improve fertilizer practices and preserving water quality in Willamette Valley, Oregon, where 55% of land-use is in grass seed production that directly impacts adjacent waterways containing native protected fish species. I determined tillage effects on soil N...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Machelle A. Nelson for the degree

Nutrient management and cycling in grass seed crops

Creator:: Horneck, Donald Arthur
Abstract:: Grass seed production in Oregon's Willamette Valley traditionally relied on open field burning for straw residue disposal and nutrient recycling. Changes in residue management from open field burning to methods that remove straw coincided with rapidly declining K soil test values. A survey of grass seed fields showed that many...
Resource Type:: Dissertation
Full Text:: . His interest and help greatly assisted my work. Mike Schulyer and Pete Nelson for the quality of

Development of Diagnostic Assays for Race Differentiation of Podosphaera macularis

Creator:: Block, Mary H.
Abstract:: Hop powdery mildew (Podosphaera macularis) was confirmed in the Pacific Northwest in 1996. Before 2012, the most common race of P. macularis was able to infect plants that possessed powdery mildew resistance based on the R-genes Rb, R3, and R5. Post 2012, two additional races of P. macularis were discovered...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Mary H. Block

Role of a grass riparian zone in controlling the fate of nitrogen in a poorly drained agricultural landscape

Creator:: Davis, Jennifer H.
Abstract:: Riparian ecosystems, through their unique positions in the agricultural landscape, have the potential to mitigate nutrient loading to streams. This study was conducted to gain a better understanding of N cycling in a poorly drained Grass Riparian Zone (GRZ) and adjacent Perennial Ryegrass seed Field (PRF) in the Willamette Valley,...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF Jennifer H. Davis for the degree

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:: chemical reactions and alterations, and cycling and polymerization of C, H, N, and 0 (Sposito, 1989

Duration of saturation and redox potentials in selected Willamette Valley soils

Creator:: Austin, Will
Resource Type:: Masters Thesis

Enhanced efficiency nitrogen fertilizers for nitrogen management in the Columbia Basin, Oregon

Creator:: Holcomb, Jess Charles
Abstract:: Ammonia (NH₃) volatilization can result in a substantial amount of surface applied nitrogen (N) being lost into the atmosphere, making it an environmental pollutant as well as reducing plant-available N. However, N can also be easily lost from the soil through leaching, and nitrous oxide (NO₂). Enhanced efficiency N fertilizers...
Resource Type:: Masters Thesis
Full Text:: . (1988): urea + 2H2O + H + urease 2NH4 + + HCO3 - further reacting as: HCO3 - + H

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:: . Sincere thanks to my committee members Drs. Larry Boersma, Richard H. Cuenca, Logan A. NOrris and Carol

ScholarsArchive@OSU

Cover crop effect on soil microbial biomass after fumigation in potato fields in the Columbia Basin

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

N processing in grass seed crops differing in soil drainage and disturbance in western Oregon, U.S.A.

Nutrient management and cycling in grass seed crops

Development of Diagnostic Assays for Race Differentiation of Podosphaera macularis

Role of a grass riparian zone in controlling the fate of nitrogen in a poorly drained agricultural landscape

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

Duration of saturation and redox potentials in selected Willamette Valley soils

Enhanced efficiency nitrogen fertilizers for nitrogen management in the Columbia Basin, Oregon

Water management effects on birdsfoot trefoil seed production

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