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Browsing Electronic Theses and Dissertations by Author

Browsing Electronic Theses and Dissertations by Author "Sullivan, Dan M."

Now showing items 1-12 of 12

Chemical and physical properties of Douglas fir bark relevant for the production of container crops in Oregon

Buamscha, Maria Gabriela (2006-11-07)
The effect of physical and hydraulic properties of peat moss and pumice on Douglas-fir bark based soil-less substrates

Zazirska Gabriel, Magdalena (2009-04-01)

Douglas-fir [Pseudotsuga menziesii (Mirbel) Franco] bark (DFB), sphagnum peat moss, and pumice are the most common substrate components used in the Oregon nursery industry. Despite the widespread use of these three co ...
Enhanced efficiency nitrogen fertilizers for nitrogen management in the Columbia Basin, Oregon

Holcomb, Jess Charles (2011-03-01)

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

Gale, Eric S. (2004-09-17)
Estimating the dry matter production, nitrogen requirements, and yield of organic farm-grown potatoes

McQueen, John Paul Gainer (2007-08-01)

As part of a participatory research project, where farmers and Oregon State University researchers collaborated, aspects of potato (Solanum tuberosum L.) growing systems were studied. It was determined through conversati ...
Improving nitrogen management with cover crops in organic broccoli production

Garrett, Amy (Amy Michelle) (2009-07-22)

Legume cover crops can serve as important sources of nitrogen (N) in sustainable agriculture and can be economically beneficial when fertilizer inputs are reduced without a yield reduction. Synchronizing N mineralization ...
Maturity and stability evaluation of composted yard debris

Brewer, Linda J. (2001-01-12)

Compost maturity is an important determinant of end use for composted municipal yard debris, and generally refers to the effect the compost has on plants. The rate of microbial respiration is an indicator of compost s ...
Nitrogen mineralization from composted and fresh yard trimmings

Nartea, Theresa J. (2000-08-01)
Nitrogen mineralization from organic amendments during the second year following application

Kusonwiriyawong, Charirat (2005-03-23)
Phosphorus availability in biosolids-amended soils

Choate, Jeffery B. (2003-06-20)
Response of Striga-susceptible and Striga-resistant sorghum genotypes to soil phosphorus and colonization by an arbuscular mycorrhizal fungus

Leytem, Alicia B. (2012-05-11)

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 ...
Suitability of diverse composts as soil amendments for highbush blueberry (Vaccinium corymbosum L.)

Costello, Ryan C. (2011-11-29)

Highbush blueberry (Vaccinium corymbosum L.) is adapted to soils with high organic matter and acidic pH. Composts provide organic matter and nutrients for growing blueberry in mineral soils, but many composts are high i ...