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Filtering by: Subject Soils -- Nitrogen content Remove constraint Subject: Soils -- Nitrogen content

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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
The ammonifying, nitrifying and respiration power of certain soils found in three habitat types in the Columbia Basin rangelands

Creator:

Wullstein, L. H. (Leroy H.)

Resource Type:

Masters Thesis
Changes in soil respiration patterns induced by altering carbon-to-nitrogen ratio with nitrate nitrogen

Creator:

McCarthy, Charlotte Marie

Resource Type:

Masters Thesis
Effects of residual and applied nitrogen on Nugaines wheat

Creator:

Laopirojana, Pojanee

Abstract:

A study was made to evaluate the effect of different rates of N fertilization on Nugaines wheat. The variable N treatments provided different N regimes as a basis for evaluating potential diagnostic tests for assessing the N status of the wheat plant. The crop was grown in Lane county during...

Resource Type:

Masters Thesis
Growth rate of wheat (Triticum aestivm L., var. Gaines) as a function of moisture stress and nitrogen supply

Creator:

Amujo, Stephen Jimo

Abstract:

The effect of moisture stress and nutrients on the rate of growth of wheat (Triticum aestivum L. Var. Gaines) seedlings was studied. A special apparatus in which the moisture stress of several perlite cells could be maintained constant by osmotic solutions was used. Predetermined amounts of nitrogen were added to...

Resource Type:

Masters Thesis
Nitrate nitrogen accumulation and distribution in the soil profile during a fallow grain rotation as influenced by different levels of soil profile moisture

Creator:

Aktan, Selman

Abstract:

The effect of different soil moisture levels on the amount and location of NO₃ -N accumulation in the soil profile were studied. The cultivars used in this study were Mcdermid, a soft white winter wheat, and Hudson, a medium early winter barley. Moisture treatments simulating dry, normal and wet fallow...

Resource Type:

Masters Thesis
Ammonia-oxidizer and denitrifier populations in boreal forest soils of differing nitrogen availability

Creator:

Burton, Marci S.

Abstract:

Nitrification and denitrification are major biological processes transforming nitrogen (N) in soils to plant available N, highly leachable nitrate (NO₃⁻) and gaseous N oxides. Although many studies in the past have studied N cycling communities, the effect of increased N inputs on ammonia-oxidizer and denitrifier population dynamics is still under...

Resource Type:

Masters Thesis
Soil nitrogen and organic matter as affected by Austrian winter peas

Creator:

Oveson, M. M. (Merrill Mahonri), 1900-

Resource Type:

Masters Thesis
Nitrate-nitrogen accumulation in the surface soil during the fallow period under different precipitation levels and tillage systems

Creator:

Senel, Atila Huseyin

Abstract:

The effects of different fallow moisture levels and tillage systems on the amount of nitrate-nitrogen accumulation in the 0-30 cm soil profile were studied. Fallow moisture treatments simulating typical dry, normal and wet precipitation cycles were established on trial plots. Data were obtained for nitrate-nitrogen, soil moisture and nitrogen mineralization...

Resource Type:

Masters Thesis
Effects of tillage systems on nitrate-nitrogen accumulation and soil structure

Creator:

Avcin, Abdulkadir

Abstract:

Effects of different tillage systems on nitrate-nitrogen accumulation in a 120 cm profile and on soil structure in the top 30 cm of the profile were studied under a fallow-wheat rotation. Treatment effects on nitrate-nitrogen, soil moisture and soil aggregation were measured. Fallow tillage treatments consisting of bare fallow, stubble-mulch...

Resource Type:

Masters Thesis

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Academic Affiliation

Crop and Soil Science8
Soils3
Crop Science2
Agronomic Crop Science1
Botany and Plant Pathology1
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Advisor

Bolton, Floyd E.4
Myrold, David D.3
Bottomley, Peter J.2
Bollen, W. B.1
Boyle, James R.1
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Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 1930 to 2017

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Committee Member

Halsey, Kimberly2
Baham, John1
Boersma, L.1
Bottomley, Peter1
Christensen, Neil1
more Committee Members »

Creator

Aktan, Selman1
Amujo, Stephen Jimo1
Avcin, Abdulkadir1
Baumeister, Nancy C.1
Burton, Marci S.1
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Date

Date range begin – Date range end

Current results range from 1930 to 2017

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Decade

2010-20192
2000-20092
1990-19997
1980-19892
1970-19792
1960-19693
1930-19391

Degree Field

Soil Science7
Crop Science3
Soils3
Agronomic Crop Science1
Botany and Plant Pathology1
more Degree Fields »

Degree Level

Master's17
Doctoral2

Degree Name

Master of Science (M.S.)17
Doctor of Philosophy (Ph.D.)2

Language

English [eng]19

License

All rights reserved4

Non-Academic Affiliation

Oregon State University. Graduate School19

Peer Reviewed

No18

Resource Type

Masters Thesis17
Dissertation2

Rights Statement

Copyright Not Evaluated14
In Copyright5

Subject

Soils -- Nitrogen content[remove]19
Soil microbiology4
Denitrification3
Forest soils2
Nitrification2
more Subjects »

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