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Dissertations / Theses on the topic 'Phosphorus'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Wood, Paul Thomas. "Phosphorus-sulphur and phosphorus-selenium heterocycles." Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47312.

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2

Hill, Micheal W. "Improving Phosphorus Use Efficiency Through Organically Bonded Phosphorus." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3469.

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Current maximum efficiency of phosphorus (P) fertilizers that is utilized by plants in the same year of application ranges from near zero to thirty percent. Despite low utilization of P in crop production, yields are often limited by P deficiencies. Innovative technology is requisite to achieve greater efficiency as fertilizer demands are increasing, while phosphorus mineral resources are rapidly being depleted. A growing environmental concern for nutrient pollution of surface waters also carries significant weight. A novel new product, Carbond® P, is promising technology to increase P use eff
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3

Jesiek, Julie B. "Phosphorus Management: An Analysis of the Virginia Phosphorus Index." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/41298.

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Excess phosphorus (P) that is transported into water bodies can cause water quality problems. A high potential for P delivery occurs when there is a high transport potential from erosion, runoff, and/or leaching coupled with high soil test P and/or high rate of fertilizer P application. A management tool is needed to identify those fields that have a high transport and source potential to deliver P to surface water. The Virginia P-Index is a mass-based tool that estimates the annual risk of delivery of P from a given field to surface water. Guidelines on P application rates are then give
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4

Bradford, Marie E. "The relationship between chemically analysed phosphorus fractions and bioavailable phosphorus /." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66053.

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5

Huang, Qianwen. "Electrodeposition of Amorphous Alloys: Nickel Cobalt Phosphorus and Iron Phosphorus." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1465574470.

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6

Yue, Chaoyang. "Phosphorus recovery from a membrane enhanced biological phosphorus removal (MEBPR) process." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/60775.

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Phosphorus is an essential yet limited element for sustaining life of human beings. Municipal wastewater contains rich phosphorus, which is not sufficiently recovered or recycled. This dissertation developed a system that could recover phosphorus from wastewater as struvite fertilizer (MgNH₄PO₄•6H₂O). Such a system included three major components — a membrane enhanced biological phosphorus removal (MEBPR) process, a side-stream unit to extract PO₄³⁻ and NH₄⁺ from wasted solids, and a struvite crystallizer. This dissertation focused on optimizing the first two steps through pilot- and bench-sca
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7

Haysom, Joan E. "Quantum well intermixing of indium gallium arsenide(phosphorus)/indium phosphorus heterostructures." Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9400.

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This thesis studies several aspects of the interdiffusion of InGaAs(P)/InP quantum well (QW) heterostructures, from the fundamental defect mechanisms, through optimization of processing parameters, to novel device applications. Conclusions from each of these areas have been drawn which further the scientific understanding and the manufacturability of the technique. The thermal stability of a series of different wafers is studied to highlight how poor quality of growth can cause increased interdiffusion, and to review the requirements for achieving repeatable annealing. Purposeful and controlle
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8

Billaid, Abdulbari Mohammed. "Factors affecting phosphorus availability and phosphorus-use efficiency in barley genotypes." Thesis, University of Aberdeen, 2011. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=167708.

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Sorption/desorption equilibria control the concentrations of P in the soil solution and thereby both its chemical and bioavailability. Apart from the equilibrium phosphorus dynamic, which has been used to determine buffer power and the equilibrium concentration for the studied soils at Cruden Bay, Balmedie, Blairton Wood and Newburgh, the buffer power and equilibrium concentration were affected by the fertiliser incubation period. The differences in PBP and EPC were observed between the soils with high constituents of organic matter and clay in their texture and those which had sandy and sandy
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9

Bhandari, Ammar B. "Improving phosphorus loss assessment with the apex model and phosphorus index." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32721.

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Doctor of Philosophy<br>Agronomy<br>Nathan O. Nelson<br>Agricultural fields contribute phosphorus (P) to water bodies, which can degrade water quality. The P index (PI) is a tool to assess the risk of P-loss from agricultural fields. However, due to limited measured data, P indices have not been rigorously evaluated. The Agricultural Policy/Environmental Extender (APEX) model could be used to generate P-loss datasets for P index evaluation and revision. The objectives of the study were to i) determine effects of APEX calibration practices on P-loss estimates from diverse management systems, ii
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10

Murby, Fredrika. "Phosphorus reduction in wastewater using microalgae with different phosphorus starvation periods." Thesis, Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-82778.

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Anthropogenic induced nutrients in the Baltic Sea have led to 97% of it being eutrophic. Phosphorus is regarded the main regulating nutrient, and nearly 25% of the nutrients coming to the Baltic Sea originate from wastewater treatment plants. To reduce the nutrient concentrations in the effluents from treatment plants, tertiary treatment methods based on chemical dosing have been the principal answer. The chemicals create a sludge in addition to remediating the water, which needs disposal. Methods for remediating secondary wastewater with microalgae exist but are not common in conventional was
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11

Wijesundara, Sunetra M. "Relationships of soil test phosphorus with soil properties and phosphorus forms." Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-151136/.

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12

Dreyfuss, Sébastien. "Utilisation de phosphore blanc et d'aminophosphines pour la formation de nanocristaux d'InP." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30100/document.

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Ce travail de thèse porte sur la synthèse de nanocristaux de phosphure d'indium (InP) et en particulier sur l'utilisation de précurseurs phosphorés tels que le phosphore blanc et les aminophosphines. Les nanocristaux d'InP sont des matériaux semi-conducteurs prometteurs dans le cadre d'applications biologiques et optoélectroniques grâce à leur faible toxicité et à leurs spectres d'absorption et de fluorescence dans le visible. En outre, le phosphore blanc, allotrope le plus réactif du phosphore, est un produit industriel fabriqué à très grande échelle. Il est en effet à l'origine de tous les p
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13

Nadeem, Muhammad. "Remobilization of seed phosphorus reserves and exogenous phosphorus uptake during germination and early growth stages of maize (Zea mays L.)." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14439/document.

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Le phosphore (P) est un élément indispensable pour la croissance des plantes. De nombreux travaux montrent des réponses très précoces à une limitation de la disponibilité en P. Pendant la germination et la croissance juvénile, la demande en P des plantules peut être satisfaite par la remobilisation des réserves en P des graines et le prélèvement racinaire. Les objectifs de la thèse sont d’étudier la contribution respective de la remobilisation des réserves en P des graines et du prélèvement racinaire de P à l’alimentation en P des plantules de maïs, et les interactions entre ces deux processus
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14

Cauduro, John, and john cauduro@dpi vic gov au. "In vitro testing of inorganic phosphorus sources for phosphorus availability in swine." RMIT University. Applied Sciences, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090401.141751.

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This research project compares different chemical and spectroscopic techniques aimed at finding a quick and cheap replacement for the measurement of digestibility of phosphorus (P) in different inorganic feed additives for pigs. This research yielded a comparison of the digestibility of different feed additives. P digestibility was determined from in vivo studies of pigs. The animal feed in the in vivo studies contained P levels below the nutrient requirements. The basal diet was a corn soybean meal base. Assessment was performed on 6 different inorganic P sources, rock phosphate (trical
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15

Brownlie, Will. "Assessing the role of domestic phosphorus emissions in the human phosphorus footprint." Thesis, Heriot-Watt University, 2014. http://hdl.handle.net/10399/2782.

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Societal phosphorus (P) use is unsustainable; P is vital for food security and its increase in the ecosphere is the single greatest cause of water quality degradation on the planet. The following thesis focuses on the role domestic P emissions play in the human P cycle with an aim to support management in reducing the individual P footprint. Measurement of the P composition of private sewage system (PSS) effluent was used to assess domestic P emissions from properties located within the Loch Leven catchment, in East Scotland, UK. This thesis shows PSS treatment type (i.e. level of additional t
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16

Williams, Gareth Rhys. "The synthesis and applications of new organo-phosphorus and organofluorine-phosphorus compounds." Thesis, University of Manchester, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.528265.

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17

Foreman, Mark Russell StJohn. "Organo-sulfur phosphorus chemistry." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/27934.

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P-organo-substituted dithiadiphosphetane disulfides have been prepared by the reaction of ferrocene and arenes with P4S10. Reaction of these compounds and Lawesson's reagent with alkenes, 2,3-dimethylbutadiene and other compounds gave organo-sulfur phosphorus compounds including 1,2-thiaphosphetane-2-sulfides such as P-ferrocenyl 1,2,5,5,7,8-hexamethyltricyclo[3,2,5,2,0]-3-thia-4-phospho-oct-7-ene-4-sulfide and a thiaphosphorine sulfide (P-ferrocenyl 4,5-dimethyl-3H,6H-1,2-thiaphosphinine-2-sulfide). Treatment of P-ferrocenyl thiaphosphorine sulfide with BuLi followed by carbon containing elec
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18

Homan, Christopher David. "Phosphorus derivatives of carbohydrates." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239564.

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19

Edwards, Christopher. "Phosphorus functionalised polymeric supports." Thesis, University of Warwick, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342700.

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20

Leute, Maria. "Macromolecules with phosphorus functionalities." [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-60833.

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21

Schönberger, Stefanie. "Phosphorus, sulfur and pyridine." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-166120.

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The synthesis of distinct neutral or anionic P,S compounds in solution provides a great challenge for chemists. Due to the similarity in the energies of the P–P, P–S and S–S bonds nearly solely a mixture of compounds with different composition and charge is obtained. Our interest focuses on the system consisting of phosphorus, sulfur and pyridine, with the aim of a greater selectivity of P,S compounds in solution. The combination of these three components offers the opportunity of stabilizing unusual P,S compounds as pyridine adducts or pyridinium salts, integration of main group and tr
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22

Wikberg, Karl Anders. "Phosphorus Balance of Sweden." Thesis, KTH, Hållbar utveckling, miljövetenskap och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263424.

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Phosphorus (P) is an essential element for all life on our planet. During the past century anthropogenic consumption of P has reached critically unsustainable levels, the mining of finite phosphate rock and the dispersion of this resource could lead to resource scarcity in the future. The need to increase knowledge and understanding for the P system is an essential part of sustainable decision making. In this thesis the P balance of Sweden is characterised and quantified using material flow analysis methodology. Furthermore, the study provides a solid foundation of knowledge and understanding
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23

Cordell, Dana. "The Story of Phosphorus : Sustainability implications of global phosphorus scarcity for food security." Doctoral thesis, Linköping : Department of Water and Environmental Studies, [The Tema Institute], Linköping University, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-53430.

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24

Challa, J. "Phosphorus and calcium metabolism in growing calves with special emphasis on phosphorus homeostasis." Thesis, University of Reading, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371434.

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25

Soltani, Morteza. "Strength, fracture morphology, and polymorphic phase transformations in phosphate-bonded high-alumina refractory compositions." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/19060.

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26

Maghraoui, Tasnime. "Diversité génotypique et fonctionnelle des rhizobia associés aux cultures mixtes Fève-Blé en conditions limitantes de phosphore au Maroc." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT147.

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Cette étude a pour principal objectif de mettre en évidence le rôle des bactéries solubilisatrices de phosphate (rhizobia) dans une meilleure gestion des systèmes de cultures associant la fève (légumineuse) et le blé (céréale) en monoculture et en cultures mixtes sous des conditions de déficience en P. Cent neuf souches de rhizobia ont été isolées à partir des nodules racinaires des plantes de V. faba dans la région de Marrakech. Les analyses phylogénétiques basées sur les gènes 16S rDNA, recA et nodD montrent que les souches étudiées sont proches phylogénétiquement de R. leguminosarum biovar
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27

Shanklin, Rachel Kristina. "Effect of Form and Amount of Phosphorus and Phytase Supplementation on Phosphorus Utilization by Ruminants." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/34316.

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The use of animal manures to replace commercial fertilizer has increased the economic and environmental sustainability of agriculture. However, this practice has resulted in excess P being applied to the soil in some areas. Excess P may run-off into surface water and leach in the ground, causing eutrophication. Decreasing the amount of P fed and improving the utilization of P are two possible nutritional solutions to this problem. Two experiments were conducted to investigate the effects of levels of dietary P, chemical form of P, and phytase supplementation in ruminants. For Exp. 1, 24 s
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28

Smith, Lydia. "Missisquoi Bay Sediment Phosphorus Cycling: the Role of Organic Phosphorus and Seasonal Redox Fluctuations." ScholarWorks @ UVM, 2009. http://scholarworks.uvm.edu/graddis/217.

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Missisquoi Bay, Lake Champlain is a eutrophic, northern shallow freshwater bay that experiences toxic cyanobacteria blooms during the summer months, largely as result of high nutrient (P and N) loading from the agricultural watershed. The sediments, which contain minerals that readily sorb P, can act as a sink or source of water column nutrients. Phosphorus, both inorganic and some organic forms, sorbs to metal oxides at neutral pH in the sediment, thus P release into overlying and pore water can be significantly affected by the reduction and subsequent solubilization of these oxides. This stu
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29

Qiu, Jieru. "Dendrons phosphorés fluorescents amphiphiles : synthèse, caractérisation, applications en oncologie." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30274.

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Les nanotechnologies ont le grand potentiel de révolutionner des technologies classiques variées, dû au développement de nombreux nanodispositifs et ont été intensément étudiées durant la dernière décade. Parmi les nanoparticules utilisées, les dendrimères et dendrons appartiennent à ce "nano-monde" en vertu de leur taille nanométrique, qui peut être modifiée à volonté, ainsi que par exemple leur multivalence et leurs charges. A l'intérieur de l'espace dendrimère, les dendrimères phosphorés apparaissent comme étant parmi les systèmes dendritiques les plus utiles, grâce à l'extraordinaire réact
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30

Gill, Stephen. "Phosphorus liberation by aquatic microorganisms /." Electronic version (Microsoft Word), 2006. http://dl.uncw.edu/etd/2006/gills/stephengill.doc.

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31

Davis, Clare Elizabeth. "Phosphorus dynamics in shelf seas." Thesis, University of Liverpool, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.569162.

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Shelf seas are highly productive regions of the world's ocean. Contributing 16 - 30 % to global ocean carbon fixation while representing a mere 7 % of the area, their importance in the carbon cycle is disproportionate to their size. This high productivity has econonimical significance, supporting over 90 % of global fishery yields (Pauly et al., 2002). Shelf seas are also physically dynamic regions. On an annual cycle, the water column in shelf seas is fully mixed in winter and thermally stratified in summer in deeper regions, with enhanced mixing along the shelf-edge. In addition, shelf seas
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32

Hogan, Erika. "Nitrogen-phosphorus relationships in lichens." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10906/.

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Nitrogen enrichment promotes phosphomonoesterase (PME) activity in the common heathland lichen Cladonia portentosa. This is associated with a marked increase in thallus N:P mass ratio and significant up-regulation of inorganic phosphate uptake capacity, evidencing a shift from N-limited to P-limited growth. Phosphomonoesterase activity in C. portentosa responds rapidly to change in N deposition load, with a significant increase in activity recorded within 6 months of transplantation from a low-N to high-N site. The location of PME activity in C. portentosa was revealed using a fluorescent mark
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33

Wilkes, Philip John. "NMR of phosphorus-containing solids." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6666/.

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The purpose of this work has been the determination of structure in solids using the technique of solid-state nuclear magnetic resonance spectroscopy. High-resolution (^31) p NMR spectra have been obtained for a range of phosphate species. A number of techniques have been applied to these systems including cross-polarization, magic angle spinning, and high power proton decoupling. Characterisation using additional NMR techniques such as (^1) H cramps has been carried out wherever possible. The results obtained yield molecular and crystallographic information consistent with data from X-ray dif
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34

Cooper, S. J. "Phosphorus metabolism in environmental microorganisms." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438177.

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35

Prastka, Katherine. "Phosphorus cycling in intertidal sediments." Thesis, University of East Anglia, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320776.

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36

Root, A. "NMR of phosphorus containing compounds." Thesis, University of East Anglia, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372798.

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37

Kleemann, Rosanna. "Sustainable phosphorus recovery from waste." Thesis, University of Surrey, 2016. http://epubs.surrey.ac.uk/809963/.

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Phosphorus (P) is an essential non-substitutable nutrient for all living organisms, but it is also a dwindling non-renewable resource. Approximately two-thirds of the world’s supply of phosphate rock is located in China, Morocco, and the USA. Phosphate rock is included in the EU list of ‘critical raw materials’ and is ranked 20th in an index of commodity price volatility. P recovery from waste water can help alleviate reliance on imported phosphate and reduce vulnerability to fluctuating prices. This project explored the options for P recovery from wastes produced across Thames Water’s waste w
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38

Thomas, Stephen Patrick. "Phosphorus mediated asymmetric cyclopropane synthesis." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613118.

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39

Garland, Jacqueline M. "Studies in phosphorus-selenium chemistry." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3688.

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Phosphorus-Selenium chemistry has seen a surge in development over the last five to ten years thanks to the optimisation of the synthesis of 2,4-diphenyl-1,3,2,4-diselenadiphosphetane-2,4-diselenide, Woollins' Reagent. This selenium analogue of the well known Lawesson's Reagent has proved itself to be a valuable asset to modern inorganic chemistry, providing a route to novel heterocycles, as well as acting as a selenation reagent with a wide range of functional groups. A series of new ammonium phenylphosphonamidodiselenoate ligands were synthesised via the reaction of Woollins' Reagent with a
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40

Brown, Martyn A. "Phosphorus and arsenic carbohydrate derivatives." Thesis, University of Aberdeen, 1993. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU552502.

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A series of O-diphenylphosphinyl monosaccharide derivatives, e.g. 1,2:5,6-di-O-cyclohexylidene-3-O-diphenyl phosphinyl--D-glucofuranose [60], has been synthesised by reaction of a free hydroxy group in a sugar with Ph_2PCl. C-Diphenylphosphinyl and diphenylarsino derivatives, e.g. methyl 4,6-O-benzylidene-3-deoxy-3-C-diphenylarsino--D-altropyranoside [89], were synthesised via reaction of Ph2PLi or Ph2AsLi with p-tosyl, mesyl, epoxy or carbonyl substituted sugar reagents. Steric factors play a large part in determining the reactivity of the precursor sugars towards the phosphorous or arsenic n
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41

Creekmore, Cathy E., and J. L. Stroehlein. "Phosphorus Response in Wine Grapes." College of Agriculture, University of Arizona (Tucson, AZ), 1990. http://hdl.handle.net/10150/215732.

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42

Dean, Kyla. "Phosphorus runoff to Clear Creek." Thesis, University of Iowa, 2011. https://ir.uiowa.edu/etd/943.

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Phosphorus is a nutrient crucial to row crop production, but phosphorus runoff from fields to nearby surface waters is a persistent problem that threatens the quality of rivers and streams. This is especially true for Iowa with its abundance of agricultural practices. In order to better understand the phosphorus dynamics of a watershed with agricultural land use, Clear Creek in Iowa was studied. Total, dissolved, and suspended reactive phosphorus concentrations were measured and mass fluxes were calculated. Through this research it was determined that most of the mass of phosphorus in Clear Cr
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43

Micheletti, Gabriele <1977&gt. "Abiotic and prebiotic phosphorus chemistry." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3841/1/Micheletti_Gabriele_tesi.pdf.

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The chief obstacle to understand the metabolic origin of life or RNA-based life is to identify a plausible mechanism for overcoming the clutter wrought by abiotic chemistry. Probably trough simple abiotic and then prebiotic reactions we could arrive to simple pre-RNA molecules. Here we report a possible preibiotic synthesis for heterocyclic compounds, and a self-assembling process of adenosine phosphates a constituent of RNA. In these processes we use a simple and prebiotic phosphorus cyclic compounds, as P4O10 and its derivatives. The processes are driven by the formation of hypercoordinate
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44

Micheletti, Gabriele <1977&gt. "Abiotic and prebiotic phosphorus chemistry." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3841/.

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The chief obstacle to understand the metabolic origin of life or RNA-based life is to identify a plausible mechanism for overcoming the clutter wrought by abiotic chemistry. Probably trough simple abiotic and then prebiotic reactions we could arrive to simple pre-RNA molecules. Here we report a possible preibiotic synthesis for heterocyclic compounds, and a self-assembling process of adenosine phosphates a constituent of RNA. In these processes we use a simple and prebiotic phosphorus cyclic compounds, as P4O10 and its derivatives. The processes are driven by the formation of hypercoordinate
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45

Capacci, Chiara <1989&gt. "Nickel-Phosphorus Homoleptic Carbonyl Clusters." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amsdottorato.unibo.it/7927/1/Capacci_Chiara_Tesi.pdf.

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This project is focused on the synthesis, the characterisation, and the study of the reactivity of a novel group of carbonyl clusters - nickel-phosphorus homoleptic carbonyl clusters. The interest in this couple of elements has risen because of their peculiar characteristics - in the past years nickel-phosphorus binary phases and nanoparticles have been widely used both as hydroprocessing catalysts and for their ceramic properties. In fact, by now nickel is the best transition metal to use in form of phosphide if a catalytic behaviour is expected. A further investigation on nickel-phosphorus
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46

Thompson, Christopher. "The Effect of Phosphorous Placement & Rate on Phosphorus Uptake, & Growth & Yield of Tomatoes." TopSCHOLAR®, 1990. https://digitalcommons.wku.edu/theses/2931.

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Research was undertaken in the summer of 1989 to determine the effect of phosphorus placement on the yield and quality of field grown tomatoes Lycopersicon esculentum. A subsequent study was undertaken in the winter of 1989 to determine the effect of phosphorus rate and placement on the early growth and phosphorus uptake of young tomatoes in the greenhouse. The purpose of this study was to attempt to find the most efficient placement and rate of supplemental phosphorus when growing tomatoes. It has been shown that placing phosphorus in a concentrated zone in contact with plant roots results in
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47

OSAFO, NANA. "Phosphorus in the sediment of L. Hällerstadsjön: spatial distribution, fractions and release to the water volume." Thesis, Linköpings universitet, Institutionen för fysik, kemi och biologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-131757.

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: In freshwater systems phosphorus (P) is the limiting element in the cause of eutrophication. In many Swedish lakes, causes of eutrophication have been attributed to more of internal loading than external since the external loading has been fairly well managed. Internal loading is linked to the mobility of sediment P, which are known to be Bioavailable P (BAP). Sediments from Lake Hällerstadsjön in Sweden was studied to know the BAP concentration and its possible release into the water column under reduced conditions. Sediments were sampled at two different depths, 0-5 cm and 5-10cm. BAP was
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48

Broomhead, Jonathan. "Calcium and phosphorus requirements in turkeys and an in vitro procedure for predicting phosphorus release /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3164491.

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49

Carliell-Marquet, Cynthia. "The effect of phosphorus enrichment on fractionation of metals and phosphorus in anaerobically digested sludge." Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/17074.

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Abstract:
In designated nutrient-sensitive areas, phosphorus must be removed from sewage before it is discharged to the receiving water body. Phosphorus-rich sludge is generated, which is usually digested anaerobically prior to disposal. This research investigated the effect of phosphorus enrichment on metal and phosphorus fractionation in anaerobically digested sludge. The use of two complementary sequential chemical extraction procedures to measure phosphorus and metal fractionation, was a key focus of the research. The fractionation procedures were tested by sequentially extracting inorganic compound
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50

Carr, Stephen Thomas David. "Investigation into phosphorus removal by iron ochre for the potential treatment of aquatic phosphorus pollution." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7663.

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Phosphorus (P) pollution of waterbodies is a global issue with detrimental environmental, social and economic impacts. Low-cost and sustainable P removal technologies are therefore required to tackle P pollution, whilst also offering a technique for reclaiming P. Ochre, a waste product from minewater treatment plants (MWTPs), has been proposed as a suitable material for the removal of P from enriched waters due to a high content of Fe, Al, Ca and Mg, which have high affinities for P removal. Whilst a range of studies have been conducted investigating ochre as a P adsorbent, most of these are l
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