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Dissertations / Theses on the topic 'Nitrogen'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Mooleki, Siyambango Patrick. "Synchronization of nitrogen availability and plant nitrogen demand, nitrogen and non-nitrogen effects of lentil to subsequent wheat crops." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0029/NQ63902.pdf.

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2

Ritchie, Karl B. "Influences of Nitrogen Supply and Elevated CO2 on Nitrogen Consumption, Nitrogen Loss, Tissue Nitrogen Concentration, and Yield of Hydroponic Wheat." DigitalCommons@USU, 1994. https://digitalcommons.usu.edu/etd/6746.

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Wheat was grown hydroponically for 23 days ( early boot stage) in a controlled environment at NO3- concentrations of 100 and 1000 μ,M and CO2 levels of 360 and 1200 μ,mol mo1-1. Nitrogen consumption and transpiration were measured daily. Tissue nitrogen concentration, total biomass, and percent root mass were measured at harvest. Nitrogen recovery and nitrogen use efficiency were calculated. Elevated CO2 increased nitrogen consumption of the 100 μ,M NO3- treatment by 13.6% and the 1000 μ,M NO3- treatment by 21.3%. These increases were particularly evident during tillering and early grain fill.

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3

Farr, C. R. "Nitrogen Stabilizer Effect on Nitrate Nitrogen Management in Soils." College of Agriculture, University of Arizona (Tucson, AZ), 1987. http://hdl.handle.net/10150/204454.

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4

Klawonn, Isabell. "Marine nitrogen fixation : Cyanobacterial nitrogen fixation and the fate of new nitrogen in the Baltic Sea." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-122080.

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Biogeochemical processes in the marine biosphere are important in global element cycling and greatly influence the gas composition of the Earth’s atmosphere. The nitrogen cycle is a key component of marine biogeochemical cycles. Nitrogen is an essential constituent of living organisms, but bioavailable nitrogen is often short in supply thus limiting primary production. The largest input of nitrogen to the marine environment is by N2-fixation, the transformation of inert N2 gas into bioavailable ammonium by a distinct group of microbes. Hence, N2-fixation bypasses nitrogen limitation and stimul

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5

Nilsson, Lino. "Nitrogen transformations at the Kiruna mine : The use of stable nitrogen isotopes to trace nitrogen-transforming processes." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-209419.

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Release of different nitrogen compounds can cause eutrophication in lakes and rivers whichcan lead to oxygen-free environments in bottom water and in the sediment and can in turnlead to fish-deaths. Ammonium can be toxic to biota and nitrate can in high concentrationeven be toxic to humans. WHO has released a limit for nitrate concentration in drinking waterof 10mg/l. The LKAB mine in Kiruna is the largest underground iron mine in the world and isprospecting, mining and refining iron ore, with an annual production of around 28 milliontons. Release of different nitrogen compounds as a result of

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6

Goshima, H., T. Suzuki, N. Hayakawa, M. Hikita, and H. Okubo. "Dielectric breakdown characteristics of cryogenic nitrogen gas above liquid nitrogen." IEEE, 1994. http://hdl.handle.net/2237/6812.

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7

Brown, Tabitha Therisa. "Variable rate nitrogen and seeding to improve nitrogen use efficiency." Thesis, Washington State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10043121.

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<p> Increased nitrogen (N) fertilizer additions to modern agricultural cropping systems will be necessary to feed a growing world population. However, greater nitrogen use efficiency (NUE) is required if agroecosystems are to continue to provide certain ecosystem services (e.g., greenhouse gas emission reductions and water quality goals). The aim of this research was to investigate the role of variable rate N and seeding of winter wheat (<i>Triticum aestivum</i>) for optimizing yield-water-NUE relationships across heterogeneous landscapes. Field plot studies were conducted at the Cook Agronomy

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8

Aguilar, Michelle. "Ruminal Nitrogen Recycling and Nitrogen Efficiency in Lactating Dairy Cattle." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/76829.

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Excess nitrogen (N) excretion from animal agriculture results in reduced air and water quality, and poses a risk to human health. Although the dairy industry utilizes milk urea N (MUN) to monitor protein feeding and N excretion, phenotypic diversity among cows may influence MUN and thus bias feed management. An initial study using data from 2 previously published research trials and a field trial, observed that cow had a significant effect on MUN variation. Regression models, utilized to predict MUN, corrected for dietary nutrients and some animal effects, and thus the observed effect of c

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9

Campana, Mariana [UNESP]. "Coletores de amônia, fontes e formas de aplicação de nitrogênio em Panicum maximum CV. Tanzânia submetido a manejo intensivo." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/95286.

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Made available in DSpace on 2014-06-11T19:27:30Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-01-12Bitstream added on 2014-06-13T20:17:00Z : No. of bitstreams: 1 campana_m_me_botfmvz.pdf: 694345 bytes, checksum: 5b95a0f43e56990d64086b8a724378b9 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Universidade Estadual Paulista (UNESP)<br>Com objetivo de validar o uso no campo do coletor de espuma com ácido e politetrafluoroetileno que capta amônia volatilizada e quantificar essa perda oriunda de fontes e formas de aplicação de nitrogênio (N) em pastagens,

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10

Barreto, Rafael Ferreira. "Interação entre silício e citocininas nas respostas do tomateiro à toxicidade de amônio /." Jaboticabal, 2019. http://hdl.handle.net/11449/182116.

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Orientador: Renato de Mello Prado<br>Coorientador: Rogério Falleiros Carvalho<br>Banca: Arthur Bernardes Cecilio Filho<br>Banca: Cid Naudi Silva Campos<br>Banca: Lucas Aparecido Gaion<br>Banca: Lilian Ellen Pino<br>Resumo: Uma consequência da toxicidade de amônio (NH4+) é a diminuição do conteúdo de citocininas (CKs). Dessa forma, o fornecimento de CK, na forma de trans-zeatina (tZ), pode aliviar a toxicidade de NH4+, e a CK sintética 6-benziladenina (BA), de menor custo, ainda não foi estudada quanto ao seu efeito sobre a toxicidade de NH4+. Além disso, o silício (Si), que é um elemento benéf

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11

Wheildon, Andrew R. "Novel nitrogen chemistry." Thesis, University of Nottingham, 1999. http://eprints.nottingham.ac.uk/13326/.

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Chapter One contains a brief overview of zeolites, their structure, uses and synthesis. Chapter Two relates to the attempted synthesis of quinuclidines via a novel 6-endo-trig radical cyclisation. Chapter Three contains a review of the 'Zip reaction' and the attempted synthesis of triazacyclopentadecane derivatives. Chapter Four relates to the synthesis of pyrrolidines via retro-Cope cyclisation methodology. Reviews of the Cope and retro-Cope reactions, nitrone synthesis and nucleophilic addition of carbon nucleophiles to nitrones are included. The synthetic work is split into three sections r

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12

Shaw, Brian Andrew. "Nitrogen stabilized zirconias." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285404.

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13

Pamplona, Maria Teresa Troina. "Aromatic nitrogen mustards." Thesis, Open University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385254.

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14

Crowston, E. H. "Nitrogen dioxide oxidations." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37986.

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15

Stadler, Christina. "Nitrogen release and nitrogen use efficiency of plant derived nitrogen fertilisers in organic horticultural soils under glasshouse conditions." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980532159.

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16

Rafle, Abdirashid Dulane 1961. "NITRATE-NITROGEN AND TOTAL NITROGEN CONCENTRATION IN GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH) AS RELATED TO NITROGEN FERTILIZATION." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/291249.

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17

Forrester, David Ian, and davidif@unimelb edu au. "Mixed-species plantations of nitrogen-fixing and non-nitrogen-fixing trees." The Australian National University. Faculty of Science, 2005. http://thesis.anu.edu.au./public/adt-ANU20050202.164252.

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Mixed-species plantations of eucalypts and acacias have the potential to improve stand productivity over that of respective monocultures through the facilitative effect of nitrogen-fixation by acacias, and increased resource capture through above- and belowground stratification. However, growth in mixed-species plantations may not be improved compared to that of monocultures when competitive interactions outweigh the effects of improved nutrient availability and resource capture. Careful selection of sites and species is therefore critical to successfully improving stand productivity using mix

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18

Cheng, J. "Interactions between nitrogen fixation and alternative sources of nitrogen in Gloeothece." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636244.

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When grown under constant illumination, <I>Gloeothece</I> ATCC 27152, a unicellular cyanobacterium, can use nitrate, nitrite, dinitrogen or ammonium as the sole N-source for growth. The uptake systems for nitrate and nitrite were fully active and ammonium-repressible in N<SUB>2</SUB>-fixing cultures. Nitrite uptake was mediated via two pH-dependent systems: passive diffusion of HNO<SUB>2</SUB> and active transport of nitrite. Nitrate uptake was highly light-dependent. Ammonium was also transported by passive diffusion of ammonia and active uptake of ammonium, depending on the pH of the medium.

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19

Mansur, Irdika. "Nitrogen uptake dynamics and biological nitrogen fixation in a silvopastoral system." Thesis, University of Canterbury. Department of Forestry, 1994. http://hdl.handle.net/10092/4243.

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Two sets of field experiment were conducted at the Lincoln University's agroforestry trial. The first experiment was to study nitrogen (N) uptake by radiata pine and pasture, and soil total N changes with time. The second experiment was to assess the magnitude of input from biological nitrogen fixation (BNF) and factors affecting BNF. Lucerne was found to be the most severe competitor with trees. It reduced tree height, root collar diameter and diameter at breast height, and occasionally reduced fascicle dry weight and foliar N content. However, lucerne had a high dry matter yield (DMY), nitro

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20

Lernbecher, Vincent. "Swedish Nitrogen Flows : A national budget of anthropogenically induced reactive nitrogen." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289176.

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Nitrogen is a fundamental element in all forms of life and a crucial component of our agricultural productivity and global food security. However, excess nitrogen caused by human activity poses a serious threat to the environment and human health. Understanding human influences on the nitrogen cycle are therefore essential for sustainable management of the nutrient. The flows of anthropogenically influenced and created reactive nitrogen in Sweden are examined in this study. Human-induced sources and mechanisms associated with nitrogen are quantified and illustrated in several charts constructe

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21

Asih, A. Rai Somaning. "Nitrogen utilization and production of dairy goats fed different nitrogen sources /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16142.pdf.

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22

Funkey, Carolina P. "Abiotic Release of Low Molecular Weight Nitrogen from Effluent Organic Nitrogen." W&M ScholarWorks, 2011. https://scholarworks.wm.edu/etd/1539617906.

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23

Forrester, David Ian. "Mixed-species plantations of nitrogen-fixing and non-nitrogen-fixing trees." Connect to this title online, 2004. http://thesis.anu.edu.au/public/adt-ANU20050202.164252/.

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24

Thompson, Astrid M. "Enchytraeids and nitrogen : the effects of nitrogen on enchytraeid populations and the influence of enchytraeids on nitrogen translocation in soil." Thesis, Durham University, 2005. http://etheses.dur.ac.uk/1288/.

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25

Haig, Paul Andrew. "Effect of dietary nitrogen solubility on nitrogen losses from lactating dairy cows." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ43169.pdf.

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26

Ring, Eva. "Nitrogen in soil water at five nitrogen-enriched forest sites in Sweden /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 2001. http://epsilon.slu.se/avh/2001/91-576-5795-5.pdf.

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27

Tomaszewski, Timothy Edward. "Atmospheric nitrogen deposition at a conifer forest: Canopy nitrogen uptake and photosynthesis." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219013.

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28

Bhogal, Anne. "Effect of long-term nitrogen applications on nitrogen cycling under continuous wheat." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294731.

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29

Warren, G. P. "Available nitrogen in relation to fractions of soil nitrogen in grassland soils." Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370367.

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30

Earl, Stevan Ross. "Nitrogen spiraling in stream ecosystems spanning a gradient of chronic nitrogen loading." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/11284.

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This dissertation is a study of the relationships between nitrogen (N) availability and spiraling (the paired processes of nutrient cycling and advective transport) in stream ecosystems. Anthropogenic activities have greatly increased rates of N loading to aquatic ecosystems. However, streams may be important sites for retention, removal, and transformation of N. In order to identify controls on NO3-N spiraling in anthropogenically impacted streams, I examined relationships among NO3-N spiraling and a suite of chemical, physical, and biological variables in streams spanning a gradient of N

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31

Cui, Jian. "Synthesis and characterization of new boron-nitrogen and boron-nitrogen-phosphorus systems." [Fort Worth, Tex.] : Texas Christian University, 2009. http://etd.tcu.edu/etdfiles/available/etd-03162010-123538/unrestricted/Cui.pdf.

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32

Norton, Eric R., and Jeffrey C. Silvertooth. "Evaluation of the Effects Added Nitrogen Interaction on Nitrogen Recovery Efficiency Calculations." College of Agriculture, University of Arizona (Tucson, AZ), 1999. http://hdl.handle.net/10150/197255.

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Two studies were conducted in 1996 and 1997 at the University of Arizona Maricopa Agricultural Center (MAC) to evaluate the added nitrogen interaction (ANI) or ‘priming effect’ on the determination of nitrogen recovery efficiencies (NRE). The method employed was to compare NRE’s as calculated by two different methods; the difference technique and the isotopic technique. The difference in NREs observed between the two methods indicates the extent of an ANI. Results demonstrated no statistical differences between NRE’s calculated by the two methods. Therefore, no ANI was observed in the field. T

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33

Zhou, Maoqian 1961. "Nitrogen fixation by alfalfa as affected by salt stress and nitrogen levels." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277231.

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The growth and Nitrogen fixation by one low salt tolerant alfalfa (Medicago sativa L.) and two germination salt tolerant selections inoculated with were investigated at two salt levels (0, -0.6 Mpa) and two N rates (1, 5ppm) using a system which automatically recirculates a nutrient solution. The high level of salinity (-0.6 Mpa osmotic potential of culture solution) resulted in substantial reduction in the N fixation percentage and total fixed N. The effect of salinity was more pronounced for later cuttings than for the earlier cutting. The N fixation percentages were substantially decreased

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34

Kakkar, Avneet. "Nitrogen Availability and Use Efficiency in Corn Treated with Contrasting Nitrogen Sources." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6886.

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The plant-soil nitrogen cycle plays a significant role in allocation of available N to plants, and improved understanding of N cycling helps sustainably increase fertilizer use efficiency. There are various processes (nitrogen mineralization and nitrification) involved in the availability and mobility of nitrogen in the soil. The primary objective of this study was to determine the NUE under contrasting nitrogen treatments over a period of five years. Additionally, we examined the effect of different N treatments on N mineralization and nitrification in conventional and organic farming systems

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35

Supeno. "Sonochemical fixation of nitrogen." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ57783.pdf.

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36

Hemmings, Philippa Rachel. "Nitrogen heterocycles from sugars." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314823.

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37

Campbell, Elizabeth M. "Nitrogen assimilation by limpets." Thesis, University of Glasgow, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479100.

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38

Slater, Jonathan. "Cyclometallated nitrogen heterocycles - metallomesogens." Thesis, University of Warwick, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269196.

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39

Michori, Peter K. "Nitrogen budget under coffee." Thesis, University of Reading, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333405.

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40

Qaddo, Akram. "Enantiospecific nitrogen heterocycle synthesis." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15791/.

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41

Supeno, Carleton University Dissertation Chemistry. "Sonochemical fixation of nitrogen." Ottawa, 2000.

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42

Georgiou, George Cleovoulos. "Nitrogen-rich oximic complexes." Thesis, London Metropolitan University, 1988. http://repository.londonmet.ac.uk/3051/.

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43

Fathi, Ghodratollah. "Nitrogen responsiveness in barley." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phf2524.pdf.

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44

Horak, Rachel Elizabeth Ann. "Controls on nitrogen fixation and nitrogen release in a diazotrophic endosymbiont of shipworms." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37238.

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Nitrogen fixation is an ecologically important microbial process that can contribute bioavailable combined N to habitats low in N. Shipworms, or wood-boring bivalves, host N2-fixing and cellulolytic symbiotic bacteria in gill bacteriocytes, which have been implicated as a necessary adaptation to an N-poor C-rich (wooden) diet. Shipworm symbionts are known to fix N within the gill habitat and newly fixed N is subsequently incorporated into non-symbiont containing host tissue. The presence of N2-fixation in gill bacteriocytes presents a conundrum because N2-fixation is tightly regulated by oxyge

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45

Cody, Michael Jonathan. "Cycling nitrogen for productivity in agroforestry, nitrogen, lignin and polyphenol controls on mineralization." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40039.pdf.

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46

Pask, Alistair. "Optimising nitrogen storage in wheat canopies for genetic reduction in fertiliser nitrogen inputs." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/12567/.

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Firstly, increasing true stem RN capacity as means to increase the maximum rate of N uptake (kg N per day) during stem elongation may be feasible through optimisation of traits such as stem length and wall thickness. Secondly, modifying true stem RN unloading by increasing storage N in relation to accumulation N may offer a realistic mechanism for improving crop BPE and thus UTE. Such an increase in true stem NRE might be achieved through manipulation of key N assimilation enzymes. Thirdly, it may be possible to select for ‘stay-green’ traits associated with lower leaf lamina NRE and lower gra

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47

Kivimäki, Sanna Katariina. "Changes in carbon and nitrogen dynamics in Sphagnum capillifolium under enhanced nitrogen deposition." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5728.

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Peatland ecosystems only cover 2-3 % of the Earth‟s surface but they represent significant carbon stores, holding approximately one third of the global soil carbon (C). The major peat forming genera Sphagnum appears to be highly sensitive to increased N availability. Many studies have shown decreased productivity of Sphagnum which could lead to a decrease in the amount of C stored, especially as many studies also show an increase in the decomposition rate with higher N deposition. However, the overall effects of N on CO2 fluxes of Sphagnum remain unclear. The present study aimed to look at the

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48

Saunders, Eleanor Margaret. "The effect of mineral nitrogen on ectomycorrhizas with special reference to nitrogen deposition." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299547.

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49

Meakins, Tracey Suzanne. "The influence of dietary nitrogen intake on urea-nitrogen salvage in the colon." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243079.

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50

Lorentz, Laura J. "Hyperspectral Reflectance and Stable Isotopic Nitrogen: Tools to Assess Forest Ecosystem Nitrogen Cycling." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51214.

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The use of nitrogenous fertilizers in agricultural and forestry practices coupled with increased fossil fuel combustion and resulting nitrogen (N) deposition across the landscape have contributed to a near doubling of N inputs to terrestrial ecosystems. With such dramatic changes have come adverse environmental consequences including the acidification of soil and water resources and an increased rate of biodiversity loss in both flora and fauna. A method of rapidly predicting ecosystem susceptibility to N loss across large spatial scales would facilitate the identification of those systems m

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