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Filtering by: Committee Member Dick, Richard Remove constraint Committee Member: Dick, Richard

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Phosphorus uptake by winter wheat cultivars as related to root characteristics

Creator:

Kaneshi, Katsuya

Abstract:

Experiments were conducted to compare differences in P uptake characteristics between two winter wheat cultivars Stephens and Yamhill (Triticum aestivum L) as related to root morphologies. Root length, root surface area and mean root radius were compared. Plant roots and shoots were separately analyzed for P content. The cultivars were...

Resource Type:

Masters Thesis
The effects of density and proportion on spring wheat and Lolium multiflorum Lam

Creator:

Concannon, Julie Ann

Abstract:

This thesis consists of four chapters. Literature is reviewed in Chapter 1. Chapter 2 describes an addition series experiment to determine the influence of species density and proportion on vegetative and reproductive yield of spring wheat and Lolium multiflorum. Chapter 3 consists of a growth analysis experiment to determine whether...

Resource Type:

Masters Thesis
Surface complexation of protons and sulfate by kaolinite

Creator:

Wildensee, Frank

Abstract:

The emission of sulfur oxides from anthropogenic sources represents a potential threat to terrestrial ecosystems. Sulfate, the most highly oxidized form of sulfur, is the most common form of inorganic sulfur in most soil environments. The sorption of sulfate may influence the alkalinity of the soil solution and as a...

Resource Type:

Masters Thesis
Field evaluation of passive capillary samplers in monitoring the leaching of agrochemicals

Creator:

Brandi-Dohrn, Florian M.

Abstract:

Soil solution samplers have certain inadequacies that limit their range of possible applications. Passive Capillary Samplers (PCAPS), which apply suction to the soil pore-water via a fiber glass wick, have shown promising results in preliminary experiments in regard to collection efficiency of water and of bromide tracers. The objectives of...

Resource Type:

Masters Thesis
Effect of density, proportion, and spatial arrangement on the competition of winter wheat and Italian ryegrass (Lolium multiflorum Lam)

Creator:

Hashem, Abul, 1956-

Resource Type:

Dissertation
Whole farm case studies : a how-to guide

Creator:

Murray, Helene

Abstract:

Calls for increased farmer involvement in research and extension programs have been numerous and well supported. One approach to integrate the collective knowledge and experience of agricultural scientists and farmers is through whole farm case studies (WFCS). An interdisciplinary team of 34 research and extension personnel at Oregon and Washington...

Resource Type:

Dissertation
Assessment of variability and monitoring methods for leaching under cover crop management

Creator:

Hess, Mario

Abstract:

The contamination of ground water resources represents a serious problem and a prominent threat to the health of our society. This study focuses on the leaching of inorganic anions as a function of agricultural practices under natural field conditions. In order to enhance the understanding of such leaching processes, this...

Resource Type:

Masters Thesis
Monitoring potential groundwater contamination due to agricultural production in Lane County, Oregon

Creator:

Gatchell, Lance O.

Resource Type:

Masters Thesis
Impact of a red clover winter cover crop on carbon and nitrogen mineralization by microorganisms in soil aggregates

Creator:

Ndiaye, Aissatou

Abstract:

Although legumes have been widely studied for their nitrogen-fixing ability, it is uncertain to what extent legume cover crops achieve their nitrogen-fixing potential under the climatic conditions encountered in western Oregon. Furthermore, it is unknown what factors control the proportions of legume cover crop N that are either sequestered into...

Resource Type:

Masters Thesis
Gene expression and intercellular transport of beet yellows closterovirus examined using tagged virus variants

Creator:

Hagiwara, Yuka

Resource Type:

Masters Thesis

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Academic Affiliation

Bioresource Engineering4
Crop and Soil Science4
Botany and Plant Pathology2
Soil Science2
Crop Science1
more Academic Affiliations »

Advisor

Selker, John S.4
Radosevich, Steven R.2
Baham, John1
Bottomley, Peter J.1
Christensen, Neil W.1
more Advisors »

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 1987 to 2005

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Committee Member

Dick, Richard[remove]15
Azarenko, Anita2
Acker, David1
Appleby, Arnold1
Appleby, Arnold P.1
more Committee Members »

Creator

Brandi Dohrn, Florian M.1
Camara, Kelli Marie1
Concannon, Julie Ann1
Darby, Heather1
Feaga, Jeff1
more Creators »

Date

Date range begin – Date range end

Current results range from 1987 to 2005

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Decade

2000-20093
1990-19998
1980-19894

Degree Field

Bioresource Engineering4
Soil Science4
Crop Science3
Botany and Plant Pathology2
Horticulture1
more Degree Fields »

Degree Level

Master's11
Doctoral4

Degree Name

Master of Science (M.S.)11
Doctor of Philosophy (Ph.D.)4

Language

English [eng]15

License

All rights reserved4

Non-Academic Affiliation

Oregon State University. Graduate School15

Peer Reviewed

No15

Resource Type

Masters Thesis11
Dissertation4

Rights Statement

Copyright Not Evaluated11
In Copyright4

Subject

Acid rain1
Agricultural chemicals -- Environmental aspects -- Oregon -- Lane County1
Agricultural pollution -- Oregon -- Willamette River Valley1
Agriculture -- Research -- On-farm1
Agriculture -- Research -- Oregon1
more Subjects »

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