subject:(nitrogen)

1. Almaraz, Maya. Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems.

Degree: Ecological and Evolutionary Biology, 2017, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:730645/

► Anthropogenic changes to the global nitrogen (N) cycle have resulted in both positive and negative consequences to environmental and human health. Where N is scarce,… (more)

Subjects/Keywords: nitrogen

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APA (6^th Edition):

Almaraz, M. (2017). Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:730645/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Almaraz, Maya. “Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems.” 2017. Thesis, Brown University. Accessed February 27, 2021. https://repository.library.brown.edu/studio/item/bdr:730645/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Almaraz, Maya. “Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems.” 2017. Web. 27 Feb 2021.

Vancouver:

Almaraz M. Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems. [Internet] [Thesis]. Brown University; 2017. [cited 2021 Feb 27]. Available from: https://repository.library.brown.edu/studio/item/bdr:730645/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Almaraz M. Nitrogen Availability and Loss from Unmanaged and Managed Ecosystems. [Thesis]. Brown University; 2017. Available from: https://repository.library.brown.edu/studio/item/bdr:730645/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Université de Neuchâtel

2. Simon, Anaële. Highways and subways: a story of fungi and bacteria in soils.

Degree: 2016, Université de Neuchâtel

URL: http://doc.rero.ch/record/278339

► Traditionnellement, bactériologues et mycologues mènent leurs recherches séparément, et ce malgré le fait que bactéries et champignons coexistent dans pratiquement tous les écosystèmes. Parmi les… (more)

▼ Traditionnellement, bactériologues et mycologues mènent leurs recherches séparément, et ce malgré le fait que bactéries et champignons coexistent dans pratiquement tous les écosystèmes. Parmi les nombreuses interactions qui peuvent avoir lieu entre champignons et bactéries, cette thèse étudie les autoroutes fongiques, une interaction dans laquelle les bactéries sont capables de se déplacer le long d’hyphes de champignons. Nous avons investigué différents sols, avec une attention particulière portée à la voie oxalate-carbonate. Dans cette voie métabolique, il semblerait que la dispersion de bactéries le long d’hyphes fongiques soit importante pour l’activité oxalotrophe des bactéries. Nous avons développé un nouvel outil, appelé <i>colonne pour autoroutes fongiques</i>, destiné à isoler spécifiquement des champignons et des bactéries capables de se déplacer le long d’hyphes fongiques. Une approche à la fois cultivable et moléculaire nous a permis d’avoir un aperçu de la diversité des champignons et des bactéries interagissant par autoroutes fongiques dans les sols. Nos résultats suggèrent que la migration de bactéries le long des hyphes peut être soit extra-hyphale (autoroutes fongiques), soit intra-hyphale (métros fongiques). Nous avons observé que le déplacement de bactéries le long des hyphes fongiques est dépendant du milieu de culture, mais nous n’avons pas pu trouver l’élément régissant ce comportement différentiel. Nos résultats montrent que les autoroutes - et métros - fongiques doivent être considérés comme cruciaux pour la colonisation de nouveaux environnements par les bactéries. De plus, ces interactions jouent un rôle important dans la structuration des communautés bactériennes dans les sols. Nous avons également démontré que des champignons présents dans la voie oxalate-carbonate sont capables de dissoudre l’oxalate de calcium, ainsi que de disperser des bactéries non-oxalotrophes, redéfinissant ainsi le rôle de chaque organisme dans la voie oxalate-carbonate. Finalement, nous avons observé une propriété surprenante de certains champignons, que l’on pourrait relier a de la fixation d’azote, mais nous n’avons pu ni prouver, ni démentir, cette capacité. Cette thèse permet d’entrevoir la complexité des interactions champignons-bactéries, et démontre qu’il est important de considérer les deux groupes d’organismes lors d’études de leur écologie dans les sols. Advisors/Committee Members: Pilar (Dir.), Eric P. (Codir.).

Subjects/Keywords: nitrogen

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APA (6^th Edition):

Simon, A. (2016). Highways and subways: a story of fungi and bacteria in soils. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/278339

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Simon, Anaële. “Highways and subways: a story of fungi and bacteria in soils.” 2016. Thesis, Université de Neuchâtel. Accessed February 27, 2021. http://doc.rero.ch/record/278339.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Simon, Anaële. “Highways and subways: a story of fungi and bacteria in soils.” 2016. Web. 27 Feb 2021.

Vancouver:

Simon A. Highways and subways: a story of fungi and bacteria in soils. [Internet] [Thesis]. Université de Neuchâtel; 2016. [cited 2021 Feb 27]. Available from: http://doc.rero.ch/record/278339.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Simon A. Highways and subways: a story of fungi and bacteria in soils. [Thesis]. Université de Neuchâtel; 2016. Available from: http://doc.rero.ch/record/278339

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

3. Somes, Christopher J. Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation.

Degree: MS, Oceanography, 2010, Oregon State University

URL: http://hdl.handle.net/1957/13836

► We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth System Climate Model designed for millennial timescale simulations.… (more)

▼ We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth System Climate Model designed for millennial timescale simulations. The model includes prognostic tracers for the stable nitrogen isotopes, ¹⁴N and ¹⁵N, in the nitrate (NO₃ˉ), phytoplankton, zooplankton, and detritus variables of the marine ecosystem model. The isotope effects of algal NO₃ˉ assimilation, water column denitrification, and zooplankton excretion are considered as well as the input of newly fixed nitrogen by diazotrophs. A global database of δ¹⁵NO₃ˉ observations is compiled from previous studies and compared to the model results on a regional basis where sufficient observations exist. The model is able to qualitatively and quantitatively reproduce the observed patterns such as high subsurface values in denitrification zones, the meridional and vertical gradients in the Southern Ocean, and the meridional gradient in the Central Equatorial Pacific. The observed subsurface minimum in the Atlantic is underestimated presumably owing to too little nitrogen fixation there. Sensitivity experiments show that algal NO₃ˉ assimilation, nitrogen fixation and water column denitrification have strong effects on the simulated distribution of nitrogen isotopes, whereas the effect from zooplankton excretion is weaker. Both water column and sedimentary denitrification also have important indirect effects on the nitrogen isotopes distribution by reducing the fixed nitrogen inventory, which creates an ecological niche for diazotrophs and stimulates additional nitrogen fixation. Water column denitrification has a strong but rather localized effect on the nitrogen isotope distribution in model versions without iron limitation of diazotrophy, in which a tight coupling of nitrogen fixation exists. However, including iron limitation of diazotrophy inhibits a tight coupling between water column denitrification and nitrogen fixation in the Eastern Pacific and shifts the main location of nitrogen fixation from the Eastern Tropical Pacific to the Western Tropical Pacific, which results in a better agreement with N' = NO₃ˉ−16PO₄³ˉ and δ¹⁵NO₃ˉ observations. Thus, our model results suggest that iron limitation of diazotrophy can modulate the feedback between denitrification and nitrogen fixation in the ocean. We speculate that a feedback response time on the centennial to millennial time scale may exist between denitrification and nitrogen fixation, producing imbalances in the global oceanic fixed nitrogen cycle, which may well have contributed to past changes of atmospheric CO₂ via the biological pump. Advisors/Committee Members: Schmittner, Andreas (advisor), Mix, Alan (committee member).

Subjects/Keywords: nitrogen; Nitrogen cycle – Mathematical models

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APA (6^th Edition):

Somes, C. J. (2010). Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/13836

Chicago Manual of Style (16^th Edition):

Somes, Christopher J. “Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation.” 2010. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/13836.

MLA Handbook (7^th Edition):

Somes, Christopher J. “Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation.” 2010. Web. 27 Feb 2021.

Vancouver:

Somes CJ. Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation. [Internet] [Masters thesis]. Oregon State University; 2010. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/13836.

Council of Science Editors:

Somes CJ. Nitrogen isotopes in a global ocean biogeochemical model : constraints on the coupling between denitrification and nitrogen fixation. [Masters Thesis]. Oregon State University; 2010. Available from: http://hdl.handle.net/1957/13836

Oregon State University

4. Zarnetske, Jay P. Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface.

Degree: PhD, Water Resources Science, 2011, Oregon State University

URL: http://hdl.handle.net/1957/23463

► The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the… (more)

▼ The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the amount of bioavailable N in the biosphere, which is causing increasingly frequent and severe impacts on ecosystems and human welfare. Streams are important features in the landscape for N cycling, because they integrate many sources of terrestrially derived N and control export to downgradient systems via internal source and sink processes. N transformations in stream ecosystems are typically very complex due to spatiotemporal variability in the factors controlling N biogeochemistry. Thus, it is difficult to predict if a particular stream system will function as a net source or sink of bioavailable N. A key location for N transformations in stream ecosystems is the hyporheic zone, where stream and ground waters mix. The hyporheic zone can be a source of bioavailable N via nitrification or a sink via denitrification. These N transformations are regulated by the physical and biogeochemical conditions of hyporheic zones. Natural heterogeneity in streams leads to unique combinations of both the physical and biogeochemical conditions which in turn result in unique N source and sink conditions. This dissertation investigates the relationships between physical and biogeochemical controls and the resulting fate of bioavailable N in hyporheic zones. The key physical factor investigated is the supply rate of solutes which is a function of transport processes - advection and dispersion, and transport conditions - hydraulic conductivity and flowpath length. Different physical conditions result in different characteristic residence times of water and solutes in hyporheic zones. The key biogeochemical factors investigated are the dynamics of oxygen (O₂), labile dissolved organic carbon (DOC), and inorganic bioavailable N (NH₄⁺ and NO₃⁻). This dissertation uses ¹⁵N isotope experiments, numerical modeling of coupled transport of the bioavailable N species, O₂ and DOC, and a suite of geophysical measurements to identify the key linkages between hydrological and biogeochemical controls on N transformations in hyporheic zones. Specifically, it was determined that the conditions governing the fate of hyporheic N are both the physical transport and reaction kinetics – the residence time of water and the O2 uptake rate. An important scaling relationship is developed by relating the characteristic timescales of residence time and O₂ uptake. The resulting dimensionless relationship, the Damköhler number for O₂, is useful for scaling different streams hyporheic zones and their role on stream N source – sink dynamics. More generally, these investigations demonstrate that careful consideration and quantification of hydrological processes can greatly inform the investigation of aquatic biogeochemical dynamics and lead to the development of process-based knowledge. In turn, this process-based knowledge will facilitate more robust approaches… Advisors/Committee Members: Haggerty, Roy (advisor), Wondzell, Steven (committee member).

Subjects/Keywords: Nitrogen Cycling; Nitrogen cycle

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APA (6^th Edition):

Zarnetske, J. P. (2011). Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/23463

Chicago Manual of Style (16^th Edition):

Zarnetske, Jay P. “Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface.” 2011. Doctoral Dissertation, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/23463.

MLA Handbook (7^th Edition):

Zarnetske, Jay P. “Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface.” 2011. Web. 27 Feb 2021.

Vancouver:

Zarnetske JP. Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface. [Internet] [Doctoral dissertation]. Oregon State University; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/23463.

Council of Science Editors:

Zarnetske JP. Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface. [Doctoral Dissertation]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/23463

Oregon State University

5. Alexander, Joseph Richard. Nitrogen status in Oregon Coast Range forest communities.

Degree: MS, Forest Science, 1980, Oregon State University

URL: http://hdl.handle.net/1957/10169

► Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) roots in four plant communities – ocean spray (Holodiscus discolor (Pursh). Maxim.)/salal (Gaultheria shallon Pursh), vine maple (Acer circinatum Pursh)/salal, sword-fern… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Alexander, J. R. (1980). Nitrogen status in Oregon Coast Range forest communities. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/10169

Chicago Manual of Style (16^th Edition):

Alexander, Joseph Richard. “Nitrogen status in Oregon Coast Range forest communities.” 1980. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/10169.

MLA Handbook (7^th Edition):

Alexander, Joseph Richard. “Nitrogen status in Oregon Coast Range forest communities.” 1980. Web. 27 Feb 2021.

Vancouver:

Alexander JR. Nitrogen status in Oregon Coast Range forest communities. [Internet] [Masters thesis]. Oregon State University; 1980. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/10169.

Council of Science Editors:

Alexander JR. Nitrogen status in Oregon Coast Range forest communities. [Masters Thesis]. Oregon State University; 1980. Available from: http://hdl.handle.net/1957/10169

Oregon State University

6. Sandstrom, Richard P. Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap.

Degree: MS, Forest Science, 1977, Oregon State University

URL: http://hdl.handle.net/1957/11058

► Roots are considered to be the major production site of amino acids that appear in the xylem sap of conifers. The carbon skeleton of amino… (more)

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Sandstrom, R. P. (1977). Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/11058

Chicago Manual of Style (16^th Edition):

Sandstrom, Richard P. “Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap.” 1977. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/11058.

MLA Handbook (7^th Edition):

Sandstrom, Richard P. “Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap.” 1977. Web. 27 Feb 2021.

Vancouver:

Sandstrom RP. Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap. [Internet] [Masters thesis]. Oregon State University; 1977. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/11058.

Council of Science Editors:

Sandstrom RP. Incorporation of ¹⁵NO₃ into amino acids of Douglas-fir xylem sap. [Masters Thesis]. Oregon State University; 1977. Available from: http://hdl.handle.net/1957/11058

University of Alberta

7. Kneteman, Kelly A. Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta.

Degree: MS, Department of Renewable Resources, 2012, University of Alberta

URL: https://era.library.ualberta.ca/files/5425kc08r

► In-situ remediation techniques such as phytoremediation have shown promise as economical alternatives for reducing the risk of environmental contaminants at impacted sites. Research trials were… (more)

Subjects/Keywords: nitrogen; phytoremediation

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APA (6^th Edition):

Kneteman, K. A. (2012). Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/5425kc08r

Chicago Manual of Style (16^th Edition):

Kneteman, Kelly A. “Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta.” 2012. Masters Thesis, University of Alberta. Accessed February 27, 2021. https://era.library.ualberta.ca/files/5425kc08r.

MLA Handbook (7^th Edition):

Kneteman, Kelly A. “Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta.” 2012. Web. 27 Feb 2021.

Vancouver:

Kneteman KA. Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta. [Internet] [Masters thesis]. University of Alberta; 2012. [cited 2021 Feb 27]. Available from: https://era.library.ualberta.ca/files/5425kc08r.

Council of Science Editors:

Kneteman KA. Phytoremediation of Nitrogen Impacted Soil and Groundwater at a Fertilizer Facility in Central Alberta. [Masters Thesis]. University of Alberta; 2012. Available from: https://era.library.ualberta.ca/files/5425kc08r

Oregon State University

8. Damsky, Leon Joseph. Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon.

Degree: MS, Bacteriology, 1955, Oregon State University

URL: http://hdl.handle.net/1957/51832

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Damsky, L. J. (1955). Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/51832

Chicago Manual of Style (16^th Edition):

Damsky, Leon Joseph. “Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon.” 1955. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/51832.

MLA Handbook (7^th Edition):

Damsky, Leon Joseph. “Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon.” 1955. Web. 27 Feb 2021.

Vancouver:

Damsky LJ. Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon. [Internet] [Masters thesis]. Oregon State University; 1955. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/51832.

Council of Science Editors:

Damsky LJ. Ammonia and nitrate nitrogen transformations in semi-arid soils of northeastern Oregon. [Masters Thesis]. Oregon State University; 1955. Available from: http://hdl.handle.net/1957/51832

Oregon State University

9. Garg, Hari Prasad. Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state.

Degree: PhD, Physics, 1975, Oregon State University

URL: http://hdl.handle.net/1957/44060

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Garg, H. P. (1975). Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/44060

Chicago Manual of Style (16^th Edition):

Garg, Hari Prasad. “Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state.” 1975. Doctoral Dissertation, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/44060.

MLA Handbook (7^th Edition):

Garg, Hari Prasad. “Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state.” 1975. Web. 27 Feb 2021.

Vancouver:

Garg HP. Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state. [Internet] [Doctoral dissertation]. Oregon State University; 1975. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/44060.

Council of Science Editors:

Garg HP. Detection and electric field quenching of nitrogen atoms in the 2s2p³3s ⁶S₅/2 meta-stable autoionizing state. [Doctoral Dissertation]. Oregon State University; 1975. Available from: http://hdl.handle.net/1957/44060

Oregon State University

10. Spink, Thomas Joseph. The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water.

Degree: MS, Chemical Engineering, 1971, Oregon State University

URL: http://hdl.handle.net/1957/46154

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Spink, T. J. (1971). The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/46154

Chicago Manual of Style (16^th Edition):

Spink, Thomas Joseph. “The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water.” 1971. Masters Thesis, Oregon State University. Accessed February 27, 2021. http://hdl.handle.net/1957/46154.

MLA Handbook (7^th Edition):

Spink, Thomas Joseph. “The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water.” 1971. Web. 27 Feb 2021.

Vancouver:

Spink TJ. The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water. [Internet] [Masters thesis]. Oregon State University; 1971. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1957/46154.

Council of Science Editors:

Spink TJ. The pressure and temperature effects on the solubility of nitrogen in distilled water: The temperature and pressure effects on the solubility of nitrogen in distilled water. [Masters Thesis]. Oregon State University; 1971. Available from: http://hdl.handle.net/1957/46154

University of Illinois – Urbana-Champaign

11. Wiegmann, Benjamin James Herbert. Maximizing corn yield potential through proper rate, placement, and timing of nitrogen fertility.

Degree: MS, Crop Sciences, 2020, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/107922

► Corn (Zea mays L.) has been a large part of American agriculture dating back to 1000 BC when flint corn arrived from Mexico, followed by… (more)

▼ Corn (Zea mays L.) has been a large part of American agriculture dating back to 1000 BC when flint corn arrived from Mexico, followed by dent corn in 1500 AD. Over the years, the improvement in these cultivars with better breeding methods and genetics in combination with crop management factors has led to ever-greater corn yields. These crop management factors include: hybrid, planting population, nitrogen (N) fertility, additional nutrient fertility, and foliar protection; and used together can increase grain yield by more than 100 bushels/acre. Nitrogen has the largest impact on corn productivity and one of the biggest decisions farmers make every year is determining their N fertility program. For these reasons, the objective of this research was to determine how N management practices can be implemented to improve corn productivity, and the thesis focused on two research areas: Utilizing Sub-Surface Drip Irrigation to Supply In-Season N and its Effect on Corn Productivity Nitrogen applied preplant helped to maximize the yield potential and increase kernel number by promoting a strong start to the growing season. Supplying N in-season through fertigation further increased corn productivity by promoting N accumulation and helped extend the growing season by maintaining leaf photosynthetic activity. The combination of preplant N and in-season N led to the greatest yields among the treatments by not only increasing kernel number, but also by producing heavier kernels as a result of limiting crop stress and supplying the mineral nutrition to the crop as needed. Combining Hydra-Hume with Side-Dress N Applications to Improve N use and Productivity of Corn Split applications of N, in addition to the different methods of split application (Y-drop or coulter) were compared to applying all the N fertilizer preplant to determine which method or timing had the greatest impact on corn productivity. The split applications of N tended to yield slightly higher than when all N was applied preplant. However, the greatest yields were achieved by split-applying N with a V6 side-dress coulter of 28% urea ammonium nitrate (UAN) down the center of the row in combination with the liquid formulation of a humic acid called Hydra-Hume. Advisors/Committee Members: Below, Frederick E (advisor), Mulvaney, Richard L (committee member), Brown, Howard M (committee member).

Subjects/Keywords: nitrogen; corn

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APA (6^th Edition):

Wiegmann, B. J. H. (2020). Maximizing corn yield potential through proper rate, placement, and timing of nitrogen fertility. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/107922

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wiegmann, Benjamin James Herbert. “Maximizing corn yield potential through proper rate, placement, and timing of nitrogen fertility.” 2020. Thesis, University of Illinois – Urbana-Champaign. Accessed February 27, 2021. http://hdl.handle.net/2142/107922.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wiegmann, Benjamin James Herbert. “Maximizing corn yield potential through proper rate, placement, and timing of nitrogen fertility.” 2020. Web. 27 Feb 2021.

Vancouver:

Wiegmann BJH. Maximizing corn yield potential through proper rate, placement, and timing of nitrogen fertility. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2020. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2142/107922.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wiegmann BJH. Maximizing corn yield potential through proper rate, placement, and timing of nitrogen fertility. [Thesis]. University of Illinois – Urbana-Champaign; 2020. Available from: http://hdl.handle.net/2142/107922

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Michigan State University

12. Davidson, John H. Distribution of nitrogen in the leaves of certain species of the Rosaceae.

Degree: MS, 1940, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:31951

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Davidson, J. H. (1940). Distribution of nitrogen in the leaves of certain species of the Rosaceae. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:31951

Chicago Manual of Style (16^th Edition):

Davidson, John H. “Distribution of nitrogen in the leaves of certain species of the Rosaceae.” 1940. Masters Thesis, Michigan State University. Accessed February 27, 2021. http://etd.lib.msu.edu/islandora/object/etd:31951.

MLA Handbook (7^th Edition):

Davidson, John H. “Distribution of nitrogen in the leaves of certain species of the Rosaceae.” 1940. Web. 27 Feb 2021.

Vancouver:

Davidson JH. Distribution of nitrogen in the leaves of certain species of the Rosaceae. [Internet] [Masters thesis]. Michigan State University; 1940. [cited 2021 Feb 27]. Available from: http://etd.lib.msu.edu/islandora/object/etd:31951.

Council of Science Editors:

Davidson JH. Distribution of nitrogen in the leaves of certain species of the Rosaceae. [Masters Thesis]. Michigan State University; 1940. Available from: http://etd.lib.msu.edu/islandora/object/etd:31951

University of Illinois – Urbana-Champaign

13. Yoder, Brian H. Corn yield following a delayed application of nitrogen.

Degree: MS, Crop Sciences, 2018, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/102524

► Delaying some of the N supplied to the corn crop is considered a way to increase N uptake and yield and to limit N losses,… (more)

▼ Delaying some of the N supplied to the corn crop is considered a way to increase N uptake and yield and to limit N losses, but the length of the delay may increase the risk of yield loss. We conducted a 3-year experiment at Urbana, Illinois in which half of the N (112 kg N ha-1) was injected as UAN at planting and the other half or all (224 kg N ha-1) of the N was dribbled UAN next to the row, at each of eight stages ranging from V3 to R3. In corn following soybean, when half of the N was applied at planting, the other half could be applied as late as R2 without significant yield loss, and application at R3 produced 92% of yield that the treatment with the second application at V3 did. Delaying application of all 224 kg N ha-1 through V15 did not decrease yield significantly, but yield declined by 12, 19 and 37% with application at VT, R2 and R3, respectively. In corn following corn, delaying the second half of the N to R3 produced 96% of the yield that the second application at V3 did, and none of the delayed timings lowered yields significantly. Delaying all the N to V9 did not significantly decrease yield, but yield thereafter decreased as the delay increased, from 11% less at V12 to 42% less at R3. Without N at planting, N needed to be applied by mid-vegetative stages to prevent yield loss, but when half the N was applied at planting, there was surprisingly little yield loss from delaying application until past pollination. SPAD readings showed that the split-N treatments were able to recover their healthy leaf color no matter how late N was applied, but with no N at planting, plants could not regain their full leaf color (or yield) if N was applied later than mid-vegetative stages. Our results indicate that even a lengthy delay in application of N can result in full yields, especially when half of the N is applied early. This application window is shortened if all of the N is delayed, in which case application should be made before plants reach mid-vegetative growth stages. Advisors/Committee Members: Nafziger, Emerson D. (advisor).

Subjects/Keywords: Corn; Nitrogen

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APA (6^th Edition):

Yoder, B. H. (2018). Corn yield following a delayed application of nitrogen. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yoder, Brian H. “Corn yield following a delayed application of nitrogen.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed February 27, 2021. http://hdl.handle.net/2142/102524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yoder, Brian H. “Corn yield following a delayed application of nitrogen.” 2018. Web. 27 Feb 2021.

Vancouver:

Yoder BH. Corn yield following a delayed application of nitrogen. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2142/102524.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yoder BH. Corn yield following a delayed application of nitrogen. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102524

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Kansas State University

14. Kunerth, Bernice Lydia. The utilization by human subjects of nitrogen from beef round and beef heart.

Degree: 1933, Kansas State University

URL: http://hdl.handle.net/2097/35918

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Kunerth, B. L. (1933). The utilization by human subjects of nitrogen from beef round and beef heart. (Thesis). Kansas State University. Retrieved from http://hdl.handle.net/2097/35918

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kunerth, Bernice Lydia. “The utilization by human subjects of nitrogen from beef round and beef heart.” 1933. Thesis, Kansas State University. Accessed February 27, 2021. http://hdl.handle.net/2097/35918.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kunerth, Bernice Lydia. “The utilization by human subjects of nitrogen from beef round and beef heart.” 1933. Web. 27 Feb 2021.

Vancouver:

Kunerth BL. The utilization by human subjects of nitrogen from beef round and beef heart. [Internet] [Thesis]. Kansas State University; 1933. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2097/35918.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kunerth BL. The utilization by human subjects of nitrogen from beef round and beef heart. [Thesis]. Kansas State University; 1933. Available from: http://hdl.handle.net/2097/35918

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of British Columbia

15. Tregidga, Angus C. A spectroscopic investigation of the formation of active nitrogen.

Degree: MA- MA, Physics, 1935, University of British Columbia

URL: http://hdl.handle.net/2429/38491

[No abstract available]

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Tregidga, A. C. (1935). A spectroscopic investigation of the formation of active nitrogen. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/38491

Chicago Manual of Style (16^th Edition):

Tregidga, Angus C. “A spectroscopic investigation of the formation of active nitrogen.” 1935. Masters Thesis, University of British Columbia. Accessed February 27, 2021. http://hdl.handle.net/2429/38491.

MLA Handbook (7^th Edition):

Tregidga, Angus C. “A spectroscopic investigation of the formation of active nitrogen.” 1935. Web. 27 Feb 2021.

Vancouver:

Tregidga AC. A spectroscopic investigation of the formation of active nitrogen. [Internet] [Masters thesis]. University of British Columbia; 1935. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2429/38491.

Council of Science Editors:

Tregidga AC. A spectroscopic investigation of the formation of active nitrogen. [Masters Thesis]. University of British Columbia; 1935. Available from: http://hdl.handle.net/2429/38491

Michigan State University

16. Chamberlain, Clark Sherman. The use of selenium compounds in the kjeldahl nitrogen determination.

Degree: MS, 1933, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:8952

Subjects/Keywords: Nitrogen

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APA (6^th Edition):

Chamberlain, C. S. (1933). The use of selenium compounds in the kjeldahl nitrogen determination. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:8952

Chicago Manual of Style (16^th Edition):

Chamberlain, Clark Sherman. “The use of selenium compounds in the kjeldahl nitrogen determination.” 1933. Masters Thesis, Michigan State University. Accessed February 27, 2021. http://etd.lib.msu.edu/islandora/object/etd:8952.

MLA Handbook (7^th Edition):

Chamberlain, Clark Sherman. “The use of selenium compounds in the kjeldahl nitrogen determination.” 1933. Web. 27 Feb 2021.

Vancouver:

Chamberlain CS. The use of selenium compounds in the kjeldahl nitrogen determination. [Internet] [Masters thesis]. Michigan State University; 1933. [cited 2021 Feb 27]. Available from: http://etd.lib.msu.edu/islandora/object/etd:8952.

Council of Science Editors:

Chamberlain CS. The use of selenium compounds in the kjeldahl nitrogen determination. [Masters Thesis]. Michigan State University; 1933. Available from: http://etd.lib.msu.edu/islandora/object/etd:8952

Tokyo Institute of Technology / 東京工業大学

17. LE, QUYNH NGA. Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column.

Degree: 博士（工学）, 2015, Tokyo Institute of Technology / 東京工業大学

URL: http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749

► Nitrogen (N) is a major nutrient that affects productivity in freshwater systems. However, the existing knowledge on the interaction between suspended particles and N transformation… (more)

Subjects/Keywords: Nitrogen dymanics; suspended particles; nitrification; dissolved nitrogen

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APA (6^th Edition):

LE, Q. N. (2015). Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column. (Thesis). Tokyo Institute of Technology / 東京工業大学. Retrieved from http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

LE, QUYNH NGA. “Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column.” 2015. Thesis, Tokyo Institute of Technology / 東京工業大学. Accessed February 27, 2021. http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

LE, QUYNH NGA. “Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column.” 2015. Web. 27 Feb 2021.

Vancouver:

LE QN. Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column. [Internet] [Thesis]. Tokyo Institute of Technology / 東京工業大学; 2015. [cited 2021 Feb 27]. Available from: http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

LE QN. Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column : Effect of Inorganic and Organic Suspended Particles on Nitrogen Transformation in Freshwater Column. [Thesis]. Tokyo Institute of Technology / 東京工業大学; 2015. Available from: http://t2r2.star.titech.ac.jp/cgi-bin/publicationinfo.cgi?q_publication_content_number=CTT100695749

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Technical University of Lisbon

18. Gonçalves, Vitória Maria Pereira. Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal.

Degree: 2013, Technical University of Lisbon

URL: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738

►

Mestrado em Engenharia do Ambiente - Instituto Superior de Agronomia

The use of anthropogenic sources of nitrogen (N) in food and energy production has negative… (more)

Subjects/Keywords: energy; environment; nitrogen losses; nitrogen footprint; consumption

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APA (6^th Edition):

Gonçalves, V. M. P. (2013). Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal. (Thesis). Technical University of Lisbon. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Gonçalves, Vitória Maria Pereira. “Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal.” 2013. Thesis, Technical University of Lisbon. Accessed February 27, 2021. https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Gonçalves, Vitória Maria Pereira. “Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal.” 2013. Web. 27 Feb 2021.

Vancouver:

Gonçalves VMP. Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal. [Internet] [Thesis]. Technical University of Lisbon; 2013. [cited 2021 Feb 27]. Available from: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Gonçalves VMP. Impact of nitrogen into the environment. A step on nitrogen footprint calculation in Lisbon, Portugal. [Thesis]. Technical University of Lisbon; 2013. Available from: https://www.rcaap.pt/detail.jsp?id=oai:www.repository.utl.pt:10400.5/5738

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Cornell University

19. Soper, Fiona. Effects Of Woody Legume (Prosopis Glandulosa) Encroachment On Nitrogen Fixation, Storage And Gas Loss In A Subtropical, Semi-Arid Savanna.

Degree: PhD, Ecology, 2016, Cornell University

URL: http://hdl.handle.net/1813/44308

► Woody encroachment, an increase in abundance and density of woody plants, currently affects millions of hectares of grassland, savanna, desert and other dryland systems globally.… (more)

▼ Woody encroachment, an increase in abundance and density of woody plants, currently affects millions of hectares of grassland, savanna, desert and other dryland systems globally. By altering the structure and function of vegetative communities, the process significantly affects human land use, biodiversity, carbon storage and biogeochemical cycling. In the tropics and subtropics, encroachment is often driven by leguminous trees. These trees support increased rates of nitrogen (N) fixation, significantly altering ecosystem N cycling, accumulation and loss. The genus Prosopis is one of the most common encroaching species throughout the tropics, and the N-fixing tree Prosopis glandulosa (honey mesquite) affects more than 40 million hectares across the southern US alone. This thesis investigates the effects of Prosopis encroachment on ecosystem N cycling in a subtropical, semi-arid savanna in south Texas. Previous studies have identified increases in soil total N storage, inorganic N concentrations, and soil N cycling rates in Prosopis-encroached soils compared with adjacent remnant grasslands. This research characterizes the magnitude and dynamics of three key processes- symbiotic N fixation, N accrual in soil and biomass, and emissions of N trace gases and N2. Chapter 1 applies a new methodological approach comparing N isotopic composition ([delta]15N) of foliage, xylem sap and plant-available soil N to investigate patterns of N fixation along a space-for-time chronosequence of encroachment. Data supports increased rates of N fixation with tree age, and seasonal variability. This approach also demonstrates that the foliar [delta]15N method typically applied to estimate rates of N fixation in ecosystems such as this is not reliable. Chapter 2 summarizes two years of field measurements of a complete suite of N trace gases (ammonia, nitrous oxide, nitric oxide and other oxidized N compounds) from encroached and unencroached soils. Measurements revealed no effect of encroachment on upland N trace gas emissions. Rather, abiotic temperature and soil wetting dynamics (including re-wetting interval) were much stronger controllers of total N flux. Chapter 3 used excised-core incubation experiments to determine whether denitrification to N2 gas might be a significant but unappreciated gas loss pathway. The outcome of these incubations showed that under fieldrealistic abiotic conditions, N2 flux is likely to be low or absent. Chapter 4 uses the chronosequence to infer rates of N fixation over time by constructing a N mass balance for individual Prosopis clusters. These calculations combine measured rates of soil N accrual with modeled or estimated rates of biomass N accrual, N deposition and N gas loss to estimate a rate for symbiotic N fixation of 0.15 kg of N per individual tree per year of growth. Scaled to landscape level, this corresponds to fixation inputs of 9.2 kg N per hectare per year. Taken together, these results suggest that this ecosystem is still in a stage of N accumulation during ongoing Prosopis encroachment,… Advisors/Committee Members: Sparks,Jed P. (chair), Groffman,Peter Mark (committee member), Drinkwater,Laurie E (committee member), Boutton,Thomas W (committee member).

Subjects/Keywords: Biological nitrogen fixation; Woody encroachment; Nitrogen cycling

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APA (6^th Edition):

Soper, F. (2016). Effects Of Woody Legume (Prosopis Glandulosa) Encroachment On Nitrogen Fixation, Storage And Gas Loss In A Subtropical, Semi-Arid Savanna. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/44308

Chicago Manual of Style (16^th Edition):

Soper, Fiona. “Effects Of Woody Legume (Prosopis Glandulosa) Encroachment On Nitrogen Fixation, Storage And Gas Loss In A Subtropical, Semi-Arid Savanna.” 2016. Doctoral Dissertation, Cornell University. Accessed February 27, 2021. http://hdl.handle.net/1813/44308.

MLA Handbook (7^th Edition):

Soper, Fiona. “Effects Of Woody Legume (Prosopis Glandulosa) Encroachment On Nitrogen Fixation, Storage And Gas Loss In A Subtropical, Semi-Arid Savanna.” 2016. Web. 27 Feb 2021.

Vancouver:

Soper F. Effects Of Woody Legume (Prosopis Glandulosa) Encroachment On Nitrogen Fixation, Storage And Gas Loss In A Subtropical, Semi-Arid Savanna. [Internet] [Doctoral dissertation]. Cornell University; 2016. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1813/44308.

Council of Science Editors:

Soper F. Effects Of Woody Legume (Prosopis Glandulosa) Encroachment On Nitrogen Fixation, Storage And Gas Loss In A Subtropical, Semi-Arid Savanna. [Doctoral Dissertation]. Cornell University; 2016. Available from: http://hdl.handle.net/1813/44308

University of Saskatchewan

20. Zakeri, Hossein. Nitrogen Acquisition of Lentil (Lens culinaris Medic) Under Varied Fertility Treatments, No Tillage Duration and Nitrogen Regimes in Saskatchewan.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-09062011-125347

► High levels of soil nitrogen (N) can interfere with N2 fixation of lentil (Lens culinaris) and have variable effects on growth, yield and maturity of… (more)

▼ High levels of soil nitrogen (N) can interfere with N2 fixation of lentil (Lens culinaris) and have variable effects on growth, yield and maturity of this indeterminate crop in Saskatchewan. In a series of field and greenhouse experiments during 2006 to 2008, response of the above-ground biomass (DW), plant N, N2 fixation, yield and days to maturity (DTM) of lentil to different N sources, time of N availability, and also to two no tillage (NT) durations were studied. First, eight cultivars of lentil were grown under three fertility treatments of granular rhizobium inoculant, 50 kg N fertilizer ha-1 and a non-treated control in three environment-years at Saskatoon and Indian Head, SK. The fertility treatments, plant N status and N2 fixation did not alter lentil DTM, but weather did. On average, lentil matured 101 and 84 days after seeding with sufficient rain and with drought, respectively. Growth and yield of the lentil were identical in the inoculant and the N fertilizer treatments. The N fertilizer treatment occasionally restricted N2 fixation, but N shortage was compensated via more N uptake from soil. The greatest N accumulation of lentil occurred during podding to maturity and benefitted pod N content. By maturity, pod, stem and leaf had 60, 24 and 14% of total dry matter and 78, 9 and 13% of total plant N, respectively. Leaf N concentration, which closely resembled soil and plant N status, was reasonably predicted by SPAD chlorophyll meter observations after pod set. Yield of five lentil cultivars was tested for the effects of 25-years (LN) versus 5-years (SN) of no tillage in the Black Soil Zone at Indian Head, SK in 2006, 2007 and 2008. In the same location, CDC Sedley was grown with four N fertilizer rates at the both LN and SN. Under terminal drought in 2006, average DW, N content and yield of the lentil cultivars in SN were greater than in LN, likely because of inhibited N2 fixation by the amplified soil N in the LN. In this year, 60 kg N fertilizer ha-1 reduced the yield difference of CDC Sedley in SN and LN. Lentil yield was identical or tended to be greater in LN than in SN with more rain in 2007 and 2008 that prolonged N mineralization and N uptake. In the greenhouse study, applying N fertilizer from flowering until podding and until maturity increased DW, N content and yield, and delayed maturity of lentil compared to lentil relying on N2 fixation. Later flowering of one cultivar or greater N2 fixation in one soil medium diminished the variation of inoculated lentil with the post-flowering N treatments, suggesting N fixation could supply lentil N requirement. Large-seeded cultivars produced greater yield than the small-seeded cultivars across environments in the fertility treatment study. Cultivar CDC Milestone produced comparable yield to high-yielding cultivars CDC Plato and CDC Greenland, but matured earlier. This cultivar showed promising results under both cool-wet and drought conditions. In contrast, CDC Sedley had lower on N2 fixation and HI values across the experiments.… Advisors/Committee Members: Bueckert, Rosalind, Coulman, Bruce, Lafond, Guy P., Vandenberg, Albert, Schoenau, Jeffrey.

Subjects/Keywords: No tillage; Lentil; Nitrogen fixation; Nitrogen partitioning

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APA (6^th Edition):

Zakeri, H. (2011). Nitrogen Acquisition of Lentil (Lens culinaris Medic) Under Varied Fertility Treatments, No Tillage Duration and Nitrogen Regimes in Saskatchewan. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-09062011-125347

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zakeri, Hossein. “Nitrogen Acquisition of Lentil (Lens culinaris Medic) Under Varied Fertility Treatments, No Tillage Duration and Nitrogen Regimes in Saskatchewan.” 2011. Thesis, University of Saskatchewan. Accessed February 27, 2021. http://hdl.handle.net/10388/etd-09062011-125347.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zakeri, Hossein. “Nitrogen Acquisition of Lentil (Lens culinaris Medic) Under Varied Fertility Treatments, No Tillage Duration and Nitrogen Regimes in Saskatchewan.” 2011. Web. 27 Feb 2021.

Vancouver:

Zakeri H. Nitrogen Acquisition of Lentil (Lens culinaris Medic) Under Varied Fertility Treatments, No Tillage Duration and Nitrogen Regimes in Saskatchewan. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10388/etd-09062011-125347.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zakeri H. Nitrogen Acquisition of Lentil (Lens culinaris Medic) Under Varied Fertility Treatments, No Tillage Duration and Nitrogen Regimes in Saskatchewan. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/etd-09062011-125347

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

21. Winsco, Kelly Nicole. Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses.

Degree: MS, Animal Science, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623

► Twenty-four Quarter horse weanlings (120 d +/- 10 d) were blocked by age into 4 groups (n = 6) for a 56 d trial to… (more)

▼ Twenty-four Quarter horse weanlings (120 d +/- 10 d) were blocked by age into 4 groups (n = 6) for a 56 d trial to evaluate the influence of methionine on growth and nitrogen retention. Weanlings were housed by block and individually fed 1 of 4 concentrate diets twice daily at 1.5% BW (as fed). Weanlings were randomly assigned to 1 of 4 treatments: basal (0.20 MET), basal + 0.03% methionine (0.23 MET), basal + 0.07% methionine (0.27 MET), and basal + 0.11% methionine (0.31 MET). Diets were formulated to be isonitrogenous, isocaloric, and contain equal amounts of LYS and THR. Coastal bermudagrass hay was individually fed at 0.75% BW (as fed). Growth measurements, body weight, rump fat, and plasma were obtained every 7 d. The final 4 days consisted of total collection of urine and feces. Feed, fecal, and urine samples were analyzed for nitrogen content and nitrogen balance was calculated. Urine was analyzed for urea and ammonia concentration. Plasma was analyzed for urea concentration. Grain, hay, and fecal samples were analyzed for nutrient composition. Data were analyzed using the PROC MIX procedure of SAS. Linear, quadratic, and cubic effects were tested in the form of contrasts. There was no influence of treatment on growth measurements, nitrogen balance, or urinary urea or ammonia. Intake of LYS and THR (g/d) did not differ among treatments (P = 0.78 and P = 0.38 respectively). Plasma urea nitrogen (PUN) was influenced by treatment (P = 0.005) exhibiting quadratic (P = 0.04) and cubic (P = 0.002) effects. An unexpected peak in PUN was observed with 0.27 MET. Upon analysis, 0.20 MET contained more lysine than formulated, and 0.27 MET contained the least lysine. Treatments 0.20 MET and 0.31 MET contained more threonine compared to formulations. These differences may explain unexpected values of PUN concentration. Results suggest future studies that more closely isolate methionine as the only dietary variable are necessary to better explain the methionine requirements of weanling horses. Advisors/Committee Members: Coverdale, Josie A. (advisor), Wickersham, Tryon A. (committee member), Carey, John B. (committee member).

Subjects/Keywords: methionine; nitrogen balance; plasma urea nitrogen; weanling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Winsco, K. N. (2011). Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623

Chicago Manual of Style (16^th Edition):

Winsco, Kelly Nicole. “Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses.” 2011. Masters Thesis, Texas A&M University. Accessed February 27, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623.

MLA Handbook (7^th Edition):

Winsco, Kelly Nicole. “Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses.” 2011. Web. 27 Feb 2021.

Vancouver:

Winsco KN. Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses. [Internet] [Masters thesis]. Texas A&M University; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623.

Council of Science Editors:

Winsco KN. Influence of Methionine on Growth and Nitrogen Balance in Weanling Quarter Horses. [Masters Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7623

Massey University

22. Espanto, Patrick Benson B. Assessment of the transport and transformation of nitrogen in the unsaturated and saturated zones under two dairy farms in the Manawatu River catchment : a thesis presented in partial fulfilment of the requirements for the degree of Master in Environmental Management at the Institute of Agriculture and Environment, Massey University, Palmerston North, Manawatu, New Zealand .

Degree: 2015, Massey University

URL: http://hdl.handle.net/10179/8322

► The importance of dairy farming in New Zealand is reflected in the country’s export and gross domestic product earnings. While the economic and food production… (more)

▼ The importance of dairy farming in New Zealand is reflected in the country’s export and gross domestic product earnings. While the economic and food production benefits are evident, there is an increasing concern about the effects of excess nutrient runoff on water quality and ecosystem health. Studies on the transport and transformation of nutrients, specifically nitrogen, are limited or mainly focused on the management and reduction of nutrient losses from the root zone. This is also the case in the Manawatu River catchment of New Zealand. The goal of this study was to assess the transport and transformation of nitrogen in the unsaturated (below the root zone) and saturated zones using field measurements, a tracer test, and identification of redox conditions in the shallow groundwater. Two sites were chosen in the Manawatu River catchment: Site 1 (Massey Dairy Farm No. 1, Palmerston North) and Site 2 (Te Matai Road, Whakarongo). Soil-water and groundwater were extracted using 12 porous cups (0.3, 0.6, 1.0, 2.0 m bgl) and four piezometers (5.8, 6.3, 7.4, 8.7 m bgl) installed at Site 1, and six piezometers (12, 18, 33, 51, 66, 87 m bgl) installed at Site 2. The extracted water samples were analysed for nitrate-nitrogen (NO3-N) and other water quality parameters. The average NO3-N concentrations in the unsaturated zone (0.3 – 2.0 m bgl) decreased with depth. At Site 1, a tracer test was conducted in November, 2013, using an application of urea (467 kg N/ha) and bromide (206 kg Br/ha). After fertiliser application, NO3-N concentrations increased in the root zone. The bromide reached only until the 2-m depth porous cup in January, 2014, after a total irrigation depth of 478 mm. The early appearance of bromide in the 0.3 m depth root zone suggested preferential flow, a pathway that speeds up transport of potential contaminants in the groundwater. The observed data of NO3-N, dissolved oxygen (DO), iron, manganese, and sulphate were utilised to assess the redox condition in groundwater at both sites. The decreasing NO3-N concentrations with increasing depth indicated dilution and/or the occurrence of denitrification in the groundwater. The groundwater redox conditions were mixed oxic-anoxic in the 5.8 – 51 m bgl and mainly anoxic below 51 m groundwater depth.

Subjects/Keywords: Soils; Water; Nitrogen content; Nitrogen cycle

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APA (6^th Edition):

Espanto, P. B. B. (2015). Assessment of the transport and transformation of nitrogen in the unsaturated and saturated zones under two dairy farms in the Manawatu River catchment : a thesis presented in partial fulfilment of the requirements for the degree of Master in Environmental Management at the Institute of Agriculture and Environment, Massey University, Palmerston North, Manawatu, New Zealand . (Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/8322

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Espanto, Patrick Benson B. “Assessment of the transport and transformation of nitrogen in the unsaturated and saturated zones under two dairy farms in the Manawatu River catchment : a thesis presented in partial fulfilment of the requirements for the degree of Master in Environmental Management at the Institute of Agriculture and Environment, Massey University, Palmerston North, Manawatu, New Zealand .” 2015. Thesis, Massey University. Accessed February 27, 2021. http://hdl.handle.net/10179/8322.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Espanto, Patrick Benson B. “Assessment of the transport and transformation of nitrogen in the unsaturated and saturated zones under two dairy farms in the Manawatu River catchment : a thesis presented in partial fulfilment of the requirements for the degree of Master in Environmental Management at the Institute of Agriculture and Environment, Massey University, Palmerston North, Manawatu, New Zealand .” 2015. Web. 27 Feb 2021.

Vancouver:

Espanto PBB. Assessment of the transport and transformation of nitrogen in the unsaturated and saturated zones under two dairy farms in the Manawatu River catchment : a thesis presented in partial fulfilment of the requirements for the degree of Master in Environmental Management at the Institute of Agriculture and Environment, Massey University, Palmerston North, Manawatu, New Zealand . [Internet] [Thesis]. Massey University; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10179/8322.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Espanto PBB. Assessment of the transport and transformation of nitrogen in the unsaturated and saturated zones under two dairy farms in the Manawatu River catchment : a thesis presented in partial fulfilment of the requirements for the degree of Master in Environmental Management at the Institute of Agriculture and Environment, Massey University, Palmerston North, Manawatu, New Zealand . [Thesis]. Massey University; 2015. Available from: http://hdl.handle.net/10179/8322

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Hong Kong University of Science and Technology

23. Cheung, Shun Yan OCES. Genetic diversity, ecophysiology and major determinants of diazotrophs in the oceanic waters.

Degree: 2018, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-104817 ; https://doi.org/10.14711/thesis-991012615466103412 ; http://repository.ust.hk/ir/bitstream/1783.1-104817/1/th_redirect.html

► Biological nitrogen fixation is a globally important process on the earth. In oceanic waters, it is an important bioavailable nitrogen source for supporting phytoplanktons in… (more)

▼ Biological nitrogen fixation is a globally important process on the earth. In oceanic waters, it is an important bioavailable nitrogen source for supporting phytoplanktons in nitrogen limited conditions, and was suggested as one of the potential negative feedback mechanisms of the earth to the global warming. This process is carried out by diverse prokaryotes called diazotrophs, in which many diazotrophs in the marine ecosystems are uncultivated and their ecophysiology is unclear. In this thesis, the genetic diversity, ecophysiology and major determinants of marine diazotrophs were explored with applying molecular techniques in large scale field studies. This thesis started with a survey conducted in the understudied Western North Pacific Ocean (WNPO), in which the Kuroshio in the WNPO was first discovered as a hotspot of diversity of unicellular cyanobacterial diazotrophs (UCYNs). By further analyzing the diazotroph communities along the whole path of the Kuroshio, we showed that the diazotrophs were actively transported by the Kuroshio, which was predicted to be enhanced under the global warming. Besides that, a new biomarker (rpoC1 gene) was adopted to further explore the phylogeny of the UCYNs in the Kuroshio, which provided new insights to the newly defined UCYN-B2 and the understudied UCYN-C group of diazotrophs. In order to identify the major determinants of diazotrophs in the oceanic waters, basin-scale and seasonal variations of diazotroph populations were examined in the North Pacific Ocean, which were found to be well explained by the ocean circulations. The dynamics of a globally significant diazotroph, UCYN-A1, was found to be mainly mediated by physical forcing (high temperature associated with El Niño event and warm current), instead of chemical factors. Moreover, the previously proposed niche differentiation of the UCYN-A sublineages was confirmed; and the fidelity of the unusual symbiotic relationship between UCYN-A sublineages and their hosts was evaluated in the basin-scale study. Besides the cyanobacterial diazotrophs, by summarizing the potentially active diazotrophs in varied regions of the open oceans, we have suggested that the members of Marine I group and Gamma-4 are the major non-cyanobacterial diazotrophs in oceanic waters. Besides that, we have first discovered the differential distributional pattern of the sublineages of Gamma-A (the most abundant member of Marine I group), which was mainly mediated by temperature. By analyzing the genome of Gamma-4, we have provided new insight of the potential strategies of the marine heterotrophic diazotrophs to overcome nutrient limitation and oxygen stress in oceanic waters.

Subjects/Keywords: Nitrogen-fixing microorganisms ; Genetics ; Nitrogen ; Fixation

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APA (6^th Edition):

Cheung, S. Y. O. (2018). Genetic diversity, ecophysiology and major determinants of diazotrophs in the oceanic waters. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-104817 ; https://doi.org/10.14711/thesis-991012615466103412 ; http://repository.ust.hk/ir/bitstream/1783.1-104817/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cheung, Shun Yan OCES. “Genetic diversity, ecophysiology and major determinants of diazotrophs in the oceanic waters.” 2018. Thesis, Hong Kong University of Science and Technology. Accessed February 27, 2021. http://repository.ust.hk/ir/Record/1783.1-104817 ; https://doi.org/10.14711/thesis-991012615466103412 ; http://repository.ust.hk/ir/bitstream/1783.1-104817/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cheung, Shun Yan OCES. “Genetic diversity, ecophysiology and major determinants of diazotrophs in the oceanic waters.” 2018. Web. 27 Feb 2021.

Vancouver:

Cheung SYO. Genetic diversity, ecophysiology and major determinants of diazotrophs in the oceanic waters. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2018. [cited 2021 Feb 27]. Available from: http://repository.ust.hk/ir/Record/1783.1-104817 ; https://doi.org/10.14711/thesis-991012615466103412 ; http://repository.ust.hk/ir/bitstream/1783.1-104817/1/th_redirect.html.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cheung SYO. Genetic diversity, ecophysiology and major determinants of diazotrophs in the oceanic waters. [Thesis]. Hong Kong University of Science and Technology; 2018. Available from: http://repository.ust.hk/ir/Record/1783.1-104817 ; https://doi.org/10.14711/thesis-991012615466103412 ; http://repository.ust.hk/ir/bitstream/1783.1-104817/1/th_redirect.html

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Stirling

24. Williams, David A R. Conformational studies on some nitrogen containing compounds.

Degree: PhD, 1971, University of Stirling

URL: http://hdl.handle.net/1893/30982

► Some N.M.R. techniques used in conformational analysis, the principal factors peculiar to heterocyclic conformational analysis, and the background to conformational effects in alkyl substituted hydroxylamines… (more)

▼ Some N.M.R. techniques used in conformational analysis, the principal factors peculiar to heterocyclic conformational analysis, and the background to conformational effects in alkyl substituted hydroxylamines are reviewed. The synthesis of N-carbethoxy- and N-methyl-tetrahydro-1,2- oxazines is discussed. The mechanism of formation of N-carbethoxytetrahydro-1,2-oxazines from the condensation of 1,4 dibromo-alkanes with N-hydroxyurethan under basic conditions is found to proceed by initial attack of the oxy-anion tautomer, formed from N-hydroxyurethane, on the more reactive bromo-substituted carbon. The preferred conformations of several N-methyl-tetrahydro1,2-oxazines are deduced from their N.M.R. spectra, and a measure of the free energy difference between the equatorial and axial positions for a methyl group substituted on any one of the four ring carbon atoms is estimated. A qualitative rationalisation of the variation in free energy difference with the point of substitution is given. The N-methyl group is found to strongly prefer the equatorial position. The stereochemistry of the B/C ring junction of the alkaloid geneserine is deduced from its N.M.R. spectra, and is found to be cis. The conformational equilibrium at nitrogen in some N,N-dimethyl-hexahydropyrimidines is studied by N.M.R. For N,N-dimethyl hexahydropyrimidine and l,3,5-trimethyl-hexahydropyrimidine a free energy difference between an equatorial and axial N-methyl group of ca. 0.5 kcal./mol. is found. A new method of measuring rate constants by N.M.R. using a small digital computer is tested by studying the barriers to internal rotation in the N,N-dimethyl amides of the three pyridine carboxylic acids. The method is found to be satisfactory, and the free energies of activation for the rotational process at 25°C are 17.9 kcal./mol. for N ,N-dimethyl picolinamide, 15,9 kcal./mol. for N,N-dimethyl nicotinamide, and 16.6 kcal./mol. for N,N-dimethyl isonicotinamide. The error on these values is considered to be less than 0.1 kcal./mol.

Subjects/Keywords: Nitrogen; Nitrogen compounds

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APA (6^th Edition):

Williams, D. A. R. (1971). Conformational studies on some nitrogen containing compounds. (Doctoral Dissertation). University of Stirling. Retrieved from http://hdl.handle.net/1893/30982

Chicago Manual of Style (16^th Edition):

Williams, David A R. “Conformational studies on some nitrogen containing compounds.” 1971. Doctoral Dissertation, University of Stirling. Accessed February 27, 2021. http://hdl.handle.net/1893/30982.

MLA Handbook (7^th Edition):

Williams, David A R. “Conformational studies on some nitrogen containing compounds.” 1971. Web. 27 Feb 2021.

Vancouver:

Williams DAR. Conformational studies on some nitrogen containing compounds. [Internet] [Doctoral dissertation]. University of Stirling; 1971. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1893/30982.

Council of Science Editors:

Williams DAR. Conformational studies on some nitrogen containing compounds. [Doctoral Dissertation]. University of Stirling; 1971. Available from: http://hdl.handle.net/1893/30982

Princeton University

25. Wang, Xingchen Tony. Nitrogen isotopes in scleractinian corals: Modern ocean studies and paleoceanographic applications .

Degree: PhD, 2016, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp01c247dv51c

► Nitrogen is an essential nutrient for every living organism and and the status of biologically available N in the ocean affects the ocean's biological productivity… (more)

▼ Nitrogen is an essential nutrient for every living organism and and the status of biologically available N in the ocean affects the ocean's biological productivity and thus the concentrations of CO2 and O2 in the atmosphere. This dissertation studies the cycling of N in both the modern and past ocean, by developing and applying a novel proxy: the nitrogen isotopes of organic matter bound within the coral carbonate skeleton (coral skeletal 15N, where 15N = [(15N/14N)sample/(15N/14N)air]-1). There are, generally speaking, two types of corals: one living in the sunlit surface ocean, typically in symbiosis with an internal photosynthetic algal population; and another living in the dark, deep ocean. This dissertation studies both types of corals and can be divided accordingly, with the two topics unified by methodology and the ultimate goal of understanding both modern and past environmental conditions. First, a new method is established for analyzing the coral skeletal 15N, requiring only 5 mg of coral carbonate and yielding a precision of 0.2‰. With this method, the distribution and controlling factors of coral skeletal 15N in the modern ocean are explored for both surface and deep sea corals. A broad range in skeletal 15N (~10‰) is observed in the modern ocean for both types of corals. Further, it is found that the skeletal 15N in surface symbiotic corals are primarily controlled by the 15N of N sources supplied to the reefs. Based on a study of the corals around Bermuda, it is inferred that the efficiency of the internal N recycling between the coral host and its symbionts can lead to a modest (<2‰) variation in skeletal 15N between offshore corals and corals in more food-rich inshore waters on a given reef. The skeletal 15N in deep sea corals is found to be dominantly controlled by the 15N of sinking N exported from the surface ocean, but with the direct N source to the corals being the suspended particulate N that derives from the sinking particles. Based on these results, both types of corals can be used to study the marine N cycle in the past. This novel proxy was applied to address two questions about the past ocean. In the first application, the skeletal 15N of more than 250 Southern Ocean deep sea fossil corals indicates nearly complete consumption of nitrate in both the Antarctic and Subantarctic Zones of the Southern Ocean during the Last Glacial Maximum, supporting the hypothesis that the entire Southern Ocean contributed to lowering the atmospheric CO2 concentration during the glacial periods. In the second application, skeletal 15N records from offshore Bermuda indicate that anthropogenic N deposition has not had a clear influence on the North Atlantic N cycle since the Industrial Revolution. This dissertation points the way to a vast range of environmental questions that can be addressed with living and fossil corals. Advisors/Committee Members: Sigman, Daniel M (advisor).

Subjects/Keywords: coral; marine nitrogen cycle; nitrogen isotopes; paleoceanography

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APA (6^th Edition):

Wang, X. T. (2016). Nitrogen isotopes in scleractinian corals: Modern ocean studies and paleoceanographic applications . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01c247dv51c

Chicago Manual of Style (16^th Edition):

Wang, Xingchen Tony. “Nitrogen isotopes in scleractinian corals: Modern ocean studies and paleoceanographic applications .” 2016. Doctoral Dissertation, Princeton University. Accessed February 27, 2021. http://arks.princeton.edu/ark:/88435/dsp01c247dv51c.

MLA Handbook (7^th Edition):

Wang, Xingchen Tony. “Nitrogen isotopes in scleractinian corals: Modern ocean studies and paleoceanographic applications .” 2016. Web. 27 Feb 2021.

Vancouver:

Wang XT. Nitrogen isotopes in scleractinian corals: Modern ocean studies and paleoceanographic applications . [Internet] [Doctoral dissertation]. Princeton University; 2016. [cited 2021 Feb 27]. Available from: http://arks.princeton.edu/ark:/88435/dsp01c247dv51c.

Council of Science Editors:

Wang XT. Nitrogen isotopes in scleractinian corals: Modern ocean studies and paleoceanographic applications . [Doctoral Dissertation]. Princeton University; 2016. Available from: http://arks.princeton.edu/ark:/88435/dsp01c247dv51c

Oklahoma State University

26. Macnack, Natasha Elizabeth. In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.).

Degree: Department of Plant and Soil Sciences, 2012, Oklahoma State University

URL: http://hdl.handle.net/11244/9341

► The algorithm currently used at Oklahoma State University for mid-season fertilizer nitrogen (N) recommendations utilizes an assumed nitrogen use efficiency (NUE) of 0.5. The recommended… (more)

Subjects/Keywords: grain protein; nitrogen uptake; nitrogen use efficiency

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APA (6^th Edition):

Macnack, N. E. (2012). In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.). (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/9341

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Macnack, Natasha Elizabeth. “In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.).” 2012. Thesis, Oklahoma State University. Accessed February 27, 2021. http://hdl.handle.net/11244/9341.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Macnack, Natasha Elizabeth. “In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.).” 2012. Web. 27 Feb 2021.

Vancouver:

Macnack NE. In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.). [Internet] [Thesis]. Oklahoma State University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/11244/9341.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Macnack NE. In Season Prediction of Nitrogen Use Efficiency and Grain Protein in Winter Wheat (Triticum Aestivum L.). [Thesis]. Oklahoma State University; 2012. Available from: http://hdl.handle.net/11244/9341

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

NSYSU

27. Hu, Shih-chieh. Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set.

Degree: Master, Chemistry, 2008, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048

► The active center of copper proteins can divide into Type I, Type II and Type III categories according to their copper coordinated environment. The synthesis… (more)

Subjects/Keywords: nitrogen; copper; sulfur

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APA (6^th Edition):

Hu, S. (2008). Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hu, Shih-chieh. “Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set.” 2008. Thesis, NSYSU. Accessed February 27, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hu, Shih-chieh. “Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set.” 2008. Web. 27 Feb 2021.

Vancouver:

Hu S. Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set. [Internet] [Thesis]. NSYSU; 2008. [cited 2021 Feb 27]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hu S. Synthesis of copper complexes containing mixed nitrogen and sulfur ligand set. [Thesis]. NSYSU; 2008. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0813108-005048

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Mississippi State University

28. Nattrass, Michael Paul. Stabilized urea fertilizer effects on corn nitrogen use efficiency and soil nitrogen transformations.

Degree: MS, Plant and Soil Sciences, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10122016-085448/ ;

► Urea based fertilizers are susceptible to N losses through volatilization, denitrification, and leaching. A field and incubation experiment were conducted at Mississippi State between… (more)

Subjects/Keywords: urea; stabilizers; nitrogen

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APA (6^th Edition):

Nattrass, M. P. (2016). Stabilized urea fertilizer effects on corn nitrogen use efficiency and soil nitrogen transformations. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10122016-085448/ ;

Chicago Manual of Style (16^th Edition):

Nattrass, Michael Paul. “Stabilized urea fertilizer effects on corn nitrogen use efficiency and soil nitrogen transformations.” 2016. Masters Thesis, Mississippi State University. Accessed February 27, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10122016-085448/ ;.

MLA Handbook (7^th Edition):

Nattrass, Michael Paul. “Stabilized urea fertilizer effects on corn nitrogen use efficiency and soil nitrogen transformations.” 2016. Web. 27 Feb 2021.

Vancouver:

Nattrass MP. Stabilized urea fertilizer effects on corn nitrogen use efficiency and soil nitrogen transformations. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2021 Feb 27]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10122016-085448/ ;.

Council of Science Editors:

Nattrass MP. Stabilized urea fertilizer effects on corn nitrogen use efficiency and soil nitrogen transformations. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10122016-085448/ ;

Cornell University

29. Raciti, Steve. Carbon And Nitrogen Dynamics In Urban Ecosystems.

Degree: PhD, Natural Resources, 2011, Cornell University

URL: http://hdl.handle.net/1813/33623

► Chapter 1: Urban areas are growing in size and importance; however we are only beginning to understand how the process of urbanization influences ecosystem dynamics.… (more)

▼ Chapter 1: Urban areas are growing in size and importance; however we are only beginning to understand how the process of urbanization influences ecosystem dynamics. In particular, there have been few assessments of how the land use history and age of residential soils influence carbon and nitrogen pools and fluxes, especially at depth. In this study, we used one-meter soil cores to evaluate soil profile characteristics and carbon and nitrogen pools in 32 residential home lawns that differed by previous land use and age, but had similar soil types. These were compared to soils from 8 forested reference sites. Chapter 2: The rapid increase in residential land area in the United States has raised concern about water pollution associated with nitrogen fertilizers. Nitrate (NO[-] ) is the form of reactive N that is most susceptible to leaching and 3 runoff; thus, a more thorough understanding of nitrification and NO[-] avail3 ability is needed if we are to accurately predict the consequences of residential expansion for water quality. In this study, we evaluated potential net nitrification and mineralization, microbial respiration and biomass, and soil NO[-] and 3 NH+ pools in residential home lawns and forests. 4 Chapter 3: We previously created a mass balance for residential lawns, however, a major N flux was missing - gaseous losses from denitrification. Using recent advances in instrumentation, we were able to measure field-relevant rates of denitrification from lawns. We calculated annual denitrification rates of 14.0 ± 3.6 kg N/ha/yr for the lawns in this study, which suggests that denitrification is an important means of removing reactive N from the residential landscape. Further work is required before these findings can be generalized to a wider range of residential lawns and soils. Chapter 4: Economic and political realities present challenges for implementing an aggressive climate change abatement program in the United States. A high efficiency approach will be essential. In this synthesis, we compared carbon budgets and evaluated carbon mitigation costs for nine counties across the northeastern United States that represent a range of biophysical, demographic and socioeconomic conditions. Advisors/Committee Members: Fahey, Timothy James (chair), Petrovic, Anthony Martin (committee member), Yavitt, Joseph B (committee member).

Subjects/Keywords: Carbon; Nitrogen; Urban

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Raciti, S. (2011). Carbon And Nitrogen Dynamics In Urban Ecosystems. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/33623

Chicago Manual of Style (16^th Edition):

Raciti, Steve. “Carbon And Nitrogen Dynamics In Urban Ecosystems.” 2011. Doctoral Dissertation, Cornell University. Accessed February 27, 2021. http://hdl.handle.net/1813/33623.

MLA Handbook (7^th Edition):

Raciti, Steve. “Carbon And Nitrogen Dynamics In Urban Ecosystems.” 2011. Web. 27 Feb 2021.

Vancouver:

Raciti S. Carbon And Nitrogen Dynamics In Urban Ecosystems. [Internet] [Doctoral dissertation]. Cornell University; 2011. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1813/33623.

Council of Science Editors:

Raciti S. Carbon And Nitrogen Dynamics In Urban Ecosystems. [Doctoral Dissertation]. Cornell University; 2011. Available from: http://hdl.handle.net/1813/33623

University of Saskatchewan

30. Kirihetti Liyanage Dona, Shwetha Jayani 1987-. Direct assessment of the fixation and release of nitrogen by pea, lentil, chickpea and faba bean.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11906

► Pulse crops make significant contributions to the economy and environmental sustainability of western Canadian cropping systems. Due to their ability to provide N and non-N… (more)

▼ Pulse crops make significant contributions to the economy and environmental sustainability of western Canadian cropping systems. Due to their ability to provide N and non-N benefits to subsequently grown crops, pulse crops play a key role in crop rotations. The aim of this study was to trace the fate of fixed N in a pulse–cereal crop sequence. The pulse phase of the study involved quantifying the amounts of fixed nitrogen in the above- and below-ground plant compartments of chickpea, faba bean, lentil and pea; and evaluate their contribution to soil nitrogen pools. Plants were labelled with 15N2 using a custom-built soil atmosphere labelling system. The amount of biologically fixed N in the above-ground biomass of the pulse crops was greatest for faba bean and chickpea (82%Ndfa), intermediate for lentil (70%Ndfa), and least for pea (28%Ndfa). Conversely, the percentage of fixed N in the below-ground biomass (i.e., roots) was greatest for the chickpea (58%Ndfa), intermediate for the faba bean (37%Ndfa) and lentil (32%Ndfa), and least for the pea (18%Ndfa). Total amounts of fixed N returned to the soil as crop residue increased in the order: pea (12 mg N pot-1) << lentil (193 mg N pot-1) << faba bean (375 mg N pot-1) < chickpea (556 mg N pot-1). The cereal phase of the study was carried out in a greenhouse to quantify the nitrogen contribution of the pulse residues to (i) the subsequent wheat crop, and (ii) nitrous oxide (N2O) emissions from the soils. The residue-amended soils were first frozen (-20C) and then slowly thawed at room temperature. Gas sampling was initiated during the thaw period, continued for 10 weeks, and was terminated two weeks prior to harvest—with the gas samples analyzed for total and 15N2O concentration. Wheat yields were about 63% greater when the previous crop was a pulse compared to when it was wheat. Recovery of fixed-N (i.e., residue-derived N) by the wheat ranged from 9% to 14% for the pulse crops, compared to recovery of only about 4% residue-derived N when the previous crop was wheat. Soils amended with pulse residue, but not wheat residue, exhibited significant N2O emissions (total and 15N2O) during the thaw period, which is indicative of greater (faster) turnover of the pulse residues. Residue-derived emissions also showed a strong positive correlation (r = 0.954; P = 0.012) with the amount of residue-N added to the soil. Advisors/Committee Members: Farrell, Richard, Lemke, Reynald, Knight, Diane, Helgason, Bobbi, Asgedom-Tedla, Haben.

Subjects/Keywords: nitrogen; pulse crops

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APA (6^th Edition):

Kirihetti Liyanage Dona, S. J. 1. (2018). Direct assessment of the fixation and release of nitrogen by pea, lentil, chickpea and faba bean. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11906

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kirihetti Liyanage Dona, Shwetha Jayani 1987-. “Direct assessment of the fixation and release of nitrogen by pea, lentil, chickpea and faba bean.” 2018. Thesis, University of Saskatchewan. Accessed February 27, 2021. http://hdl.handle.net/10388/11906.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kirihetti Liyanage Dona, Shwetha Jayani 1987-. “Direct assessment of the fixation and release of nitrogen by pea, lentil, chickpea and faba bean.” 2018. Web. 27 Feb 2021.

Vancouver:

Kirihetti Liyanage Dona SJ1. Direct assessment of the fixation and release of nitrogen by pea, lentil, chickpea and faba bean. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10388/11906.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kirihetti Liyanage Dona SJ1. Direct assessment of the fixation and release of nitrogen by pea, lentil, chickpea and faba bean. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11906

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations