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Filtering by: Subject Soils -- Nitrate content Remove constraint Subject: Soils -- Nitrate content Advisor Bottomley, Peter J. Remove constraint Advisor: Bottomley, Peter J.

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Measurement of microbial biomass phosphorus in Oregon soils

Creator:

Claycomb, Peter T.

Resource Type:

Masters Thesis

Full Text:

of soil E. 3. Changes in gravimetric water content of field 61 soils during the sampling period. 4a
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

Full Text:

matter content of a soil and the degree of aggregate stability. Good soil structure for crop growth
An Examination of Factors Controlling the Activity of Ammonia- and Nitrite-oxidizers in Diverse Soils

Creator:

Giguere, Andrew T.

Abstract:

Nitrification is a critical step in the global nitrogen cycle involving the biological oxidation of ammonia (NH₃) to nitrite (NO₂⁻ ) and then to nitrate (NO₃⁻). The first step in nitrification is carried out by NH₃-oxidizing bacteria (AOB) and archaea (AOA), and the second by NO₂⁻-oxidizing bacteria (NOB). In addition...

Resource Type:

Dissertation

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content of soil samples was determined. The three field samples of cropped or non-cropped soil from each
Soil community dynamics in sagebrush and cheatgrass-invaded ecosystems of the northern Great Basin

Creator:

DeCrappeo, Nicole M.

Abstract:

Sagebrush steppe ecosystems in the Great Basin have become increasingly threatened by the proliferation of cheatgrass (Bromus tectorum L.), an invasive annual grass. Diverse sagebrush and perennial bunchgrass landscapes can be converted to homogenous cheatgrass grasslands mainly through the effects of fire. Although the consequences of this conversion are well...

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Dissertation

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stability, which is a qualitative measure of soil texture, organic matter content, microbial activity, and

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Academic Affiliation

Crop and Soil Science4

Advisor

Bottomley, Peter J.[remove]4
Myrold, David D.2

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 1992 to 2017

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Committee Member

Baham, John1
Belnap, Jayne1
Dick, Richard1
Halsey, Kimberly1
Kleber, Markus1
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Creator

Claycomb, Peter T.1
Decrappeo, Nicole M.1
Giguere, Andrew T.1
Ndiaye, Aissatou1

Date

Date range begin – Date range end

Current results range from 1992 to 2017

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Decade

2010-20192
1990-19992

Degree Field

Soil Science4

Degree Level

Doctoral2
Master's2

Degree Name

Doctor of Philosophy (Ph.D.)2
Master of Science (M.S.)2

Language

English [eng]4

License

All rights reserved2

Non-Academic Affiliation

Oregon State University. Graduate School4

Peer Reviewed

No4

Resource Type

Dissertation2
Masters Thesis2

Rights Statement

In Copyright3
Copyright Not Evaluated1

Subject

Soils -- Nitrogen content2
Ammonia -- Oxidation1
Cheatgrass brome -- Control -- Great Basin1
Cover crops1
Nematodes -- Ecology -- Great Basin1
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