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Low molecular weight organic acids in forest soils

Creator:: Hayden, John
Abstract:: Two studies concerning low molecular weight organic acids in soils were conducted. In the first study, anion exclusion chromatography was used to separate and identify 12 common organic acids, and the accuracy, precision and detection limits of the method were determined. The method was found to be sensitive and accurate...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF John Hayden for the degree of

Winter wheat response to nitrogen, phosphorus, sulfur, and zinc supplied by municipal biosolids

Creator:: Shearin, Todd E.
Resource Type:: Masters Thesis
Full Text:: Dr. Neil Christensen for suggestions and instruction on soil fertility. To Dr. John Hart for help on

Nitrogen fertilization of winter wheat grown in four rotations in western Oregon

Creator:: Sebastian, Kevin D.
Resource Type:: Masters Thesis
Full Text:: : Russell S. Karow John M. Hart Accurate assessment of nitrogen (N) fertilizer requirements could result

Ion exchange membranes and agronomic responses as tools for assessing nutrient availability

Creator:: Salisbury, Steven Earl
Abstract:: Winter wheat is commonly grown in rotation with leguminous and non-leguminous crops in the Willamette Valley. For agronomic, economic, and environmental reasons it is important to understand the influence of previous crops on availability of N and other nutrients. Objectives of this study were: (1) to evaluate the effects of...
Resource Type:: Masters Thesis
Full Text:: . He is an excellent advisor and a good friend. John Hart, who served as a committee member, 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:: from my own mistakes. His patience and investment of time are greatly appreciated. John Hart, who

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:: . David Myrold, Dr. John Selker, and Dr. Kenneth Johnson, for all of their helpful suggestion and

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:: compilation of this thesis. Thanks also to Drs. Neil Christensen, John Rohovec, and Barry Sherr for

Nitrogen mineralization from composted and fresh yard trimmings

Creator:: Nartea, Theresa J.
Resource Type:: Masters Thesis
Full Text:: committee, Dr. Neil Christensen (Soil Science); Dr. John Bolte (Bioresource Engineering) and Dr. Phil

Soil biological indices and nitrogen availability during a simulated transition from inorganic to organic sources of nitrogen

Creator:: Fauci, Mary F.
Resource Type:: Masters Thesis
Full Text:: activity in most soils (Rasmussen et al, 1989; Bolton et al., 1985; McGill et al., 1986; Stevenson, 1982

Inorganic nitrogen and soil biological dynamics in cover crop systems

Creator:: Kauffman, Susan Muna
Resource Type:: Masters Thesis
Full Text:: in fallow soils. Soil Biol. Biochem. 12:281-291. Stevenson, F.J. 1986. Cycles of Soil. John Wiley

ScholarsArchive@OSU

Low molecular weight organic acids in forest soils

Winter wheat response to nitrogen, phosphorus, sulfur, and zinc supplied by municipal biosolids

Nitrogen fertilization of winter wheat grown in four rotations in western Oregon

Ion exchange membranes and agronomic responses as tools for assessing nutrient availability

Evaluation of soil and plant analyses as components of a nitrogen monitoring program for silage corn

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

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

Nitrogen mineralization from composted and fresh yard trimmings

Soil biological indices and nitrogen availability during a simulated transition from inorganic to organic sources of nitrogen

Inorganic nitrogen and soil biological dynamics in cover crop systems

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