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Tesi sul tema "Soil phosphorus"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

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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2

roberts, john christopher. "Impact of Manure and Soil Test Phosphorus on Phosphorus Runoff from Soils Subjected to Simulated Rainfall." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-06162005-123000/.

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Abstract (sommario):

Runoff from agricultural fields amended with animal manure or fertilizer is a source of phosphorus (P) pollution to surface waters, which can have harmful effects such as eutrophication. The objectives of this study were to evaluate the impact of soil P status and the P composition of manure sources on P in runoff, characterize the effects of manure sources on mass loss of dissolved reactive P (DRP), total dissolved P (TDP), algal available P (AAP) and total P (TP) in runoff, and enhance the PLAT database with respect to soluble P attenuating factor (SPAF) and non-soluble P attenuating factor

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3

Ahmad, Nor Ashikin. "Phosphorus Dynamics in Soils Amended with Recycled Organics." Thesis, Griffith University, 2017. http://hdl.handle.net/10072/365472.

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Soils organic amendments are increasingly being used as an alternative to conventional inorganic fertilizer to reduce deterioration of soil quality brought about by high inputs of chemicals and to counteract the depletion of mineral phosphorus (P) sources. The organic wastes, now referred to as recycled organics (RO), have been used in recent years as soil amendments to improve soil quality and crop growth. However, continuous application of RO amendments may result in the accumulation of P in soil and can eventually lead to eutrophication in surface water through excessive P runoff. Bioavaila

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4

Sekhon, Bharpoor Singh. "Modeling of soil phosphorus sorption and control of phosphorus pollution with acid mine drainage floc." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2530.

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Thesis (Ph. D.)--West Virginia University, 2002.<br>Title from document title page. Document formatted into pages; contains xiv, 210 p. : ill. (some col.). Includes abstract. Includes bibliographical references.

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5

Ebuele, Victor Pghogho. "Phosphorus speciation in soil and plants." Thesis, Bangor University, 2016. https://research.bangor.ac.uk/portal/en/theses/phosphorus-speciation-in-soil-and-plants(c9a2b08e-cca7-48ad-ac49-79b772d17602).html.

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To better understand the dynamics of P in soil and plants, chemical characterization and solution 31P nuclear magnetic resonance spectroscopy (NMR) were applied to a natural vegetation system dominated by bracken (Pteridium aquilinum (L.) Kuhn) and British bluebells (Hyacinthoides non-scripta (L.) Chouard ex Rothm.) and to different types of organically amended agricultural soils. Organic P (Po) was dominant in the natural system while the agricultural soil of the total P more than 80% was inorganic P (Pi) mainly in the form of orthophosphate. A detailed quantitative analysis of the P forms in

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6

Pierzynski, Joy. "THE EFFECTS OF P FERTILIZER ADDITION ON P TRANSFORMATIONS ON HIGH-P FIXING AND GRASSLAND SOILS." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34548.

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Doctor of Philosophy<br>Department of Agronomy<br>Ganga M. Hettiarachchi<br>Although phosphorus (P) is an essential nutrient for the growth of plants, it is one of the most limiting nutrients in terms of availability as a high proportion of applied P rapidly transforms into insoluble forms with low solubility in soils. To further understand the fate of P applied to soils, two separate but related studies using three high P-fixing soil types each were used for which the objectives were to investigate the mobility, availability, and reaction products from two granular and one liquid P fertilizer

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7

Abou, Nahra Joumana. "Modeling phosphorus transport in soil and water." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102946.

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The main objective of this project was to investigate and model phosphorus (P) transport in soil column studies. A model named HYDRUS-NICA was developed, by coupling a hydrological and transport model (HYDRUS-1D model) with an aqueous chemical model (non-ideal competitive adsorption - NICA), to improve the predictions of P transport in soil and water. The HYDRUS-NICA model was developed by replacing the non-linear empirical (Freundlich and Langmuir) equations of the HYDRUS-1D model with the NICA model equations. The numerical accuracy of the HYDRUS-NICA model was then evaluated by comparing th

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8

A, Heskett Richard. "Determining soil phosphorus concentrations using cattail indicators." Virtual Press, 1997. http://liblink.bsu.edu/uhtbin/catkey/1048396.

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Excess phosphorus is often identified as a major factor in the eutrophication of wetlands and lakes. Often attributed to agricultural practices, the specific source of a large part of this excess has been difficult to determine. The term "nonpoint" source is often used to broadly describe the inflow along waterways of significant amounts of this essential plant nutrient and other pollution. This research was intended to determine the effectiveness of using cattails (Typha), a common plant along waterways, as indicators of plant available phosphorus in the soil along these waterways. Two sites

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9

Undercoffer, Jason. "Monitoring Phosphorus Transport and Soil Test Phosphorus From Two Distinct Drinking Water Treatment Residual Application Methods." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243532451.

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10

Norton, E. R., J. C. Silvertooth, and L. J. Clark. "Phosphorus Fertility Evaluation in Graham County." College of Agriculture, University of Arizona (Tucson, AZ), 2002. http://hdl.handle.net/10150/197714.

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A series of three phosphorus (P) fertility experiments were conducted in 2001 in Graham County. These studies follow similar experiments conducted over the past three seasons. Results from 2001 were consistent with previous results indicating a positive relationship between yield and P fertilizer applications in relation to soil test indices. Modest yield increases were observed from a minimum of 25 to 80 lbs. lint per acre with an application of approximately 70 lbs. of P as P₂O₅ per acre. Yield differences from previous years have been as great as 170 lbs. of lint per acre. With the increase

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11

Norton, E. R., and L. J. Clark. "Phosphorus Fertility Evaluation in Graham County." College of Agriculture, University of Arizona (Tucson, AZ), 2003. http://hdl.handle.net/10150/197930.

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A field study was implemented in 2002 in the Upper Gila River Valley of Safford to investigate the effects of varying phosphorus (P) fertilization rates on yield and quality of Upland cotton. This study is a continuation of work performed in this valley that began in 1998. This study was organized in a randomized complete block design with four treatments including four rates of 10-34-0 fertilizer, 0, 15, 30, and 45 gallons per acre (gpa) replicated 4 times. Lint yield results indicate a positive response to the application of 10-34-0 fertilizer with yield increasing linearly up to 30 gpa. The

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12

Lee, Seung Hwan. "Phosphorus removal mechanisms in soil and slag media." University of Technology, Sydney. Faculty of Engineering, 1995. http://hdl.handle.net/2100/356.

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Excessive phosphorus (P) is one of the major pollutants in natural water that are responsible for algal blooms and eutrophication. P removal by soil and slag is an attractive solution if the P sorption capacity of soil or slag is significant. To design an efficient land treatment facility, basic information on the behaviour of P in the media-water environment is required. In this study, detailed experiments were conducted to study P removal under static and dynamic conditions, and mathematical models were developed to describe these processes. The kinetic studies on P sorption onto a sandy loa

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13

McLaughlin, Michael John. "Phosphorus cycling in soil under wheat-pasture rotations /." Title page, contents and summary only, 1986. http://web4.library.adelaide.edu.au/theses/09PH/09phm1615.pdf.

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14

Fischer, Peter. "The degree of phosphorus saturation of agricultural soils in Brazil and Germany: New approaches for risk assessment of diffuse phosphorus losses and soil phosphorus management." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19589.

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Diffuse Phosphor (P)-Austräge aus der Landwirtschaft tragen zur Gewässereutrophierung bei. Der Phosphorsättigungsgrad (DPS) ist ein etablierter Parameter, um das P-Austragsrisiko aus Böden zu erfassen. Ein bodentypunabhängiger Ansatz, der die Abschätzung des DPS durch eine einfache Standardmethode wasserlöslichen P (WSP) ermöglicht (WSP-DPS-Ansatz), wurde an europäischen Böden entwickelt. In der Dissertation wurde dieser Ansatz erstmalig: i) an tropischen Böden getestet und ii) dazu verwendet P-Austragsrisiken von Boden-P-Monitoringdaten und von landwirtschaftlichen Institutionen empfohlenen P

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15

Mukherjee, Atanu. "Evaluation of soil test methods as indicators of releasable phosphorus in wetland soils." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011845.

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16

Florence, Robert J. "Comparing soil testing methods for soil organic matter, lime requirements, and developing a phosphorus soil test correlation." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/18903.

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Doctor of Philosophy<br>Department of Agronomy<br>Dave Mengel<br>The Kansas State University Soil Testing Laboratory currently uses the Walkley-Black (WB) method for soil organic matter (SOM) estimations, the Shoemaker-Mclean-Pratt (SMP) buffer for lime recommendations, and bases the soybean phosphorus (P) critical value for P fertilizer recommendations off other crops. Hazardous waste is produced from WB and SMP creating a health hazard for workers, and substantial cost for handling and disposal. The substantial increase in land area devoted to soybean creates the need to validate currently

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17

Croat, Samantha Jo. "Phosphorus Dynamics and Crop Productivity in Bakken Crude-Oil Remediated Soils." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/29169.

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Thermal desorption (TD), a remediation method used to remove hydrocarbons from contaminated soils, may cause changes in soil properties that threaten soil function and plant productivity. The goal of this research is to better understand the effect that TD treatment has on soils intended for agricultural use. A series of soil phosphorus (P) sorption and desorption experiments were conducted on soils before and after TD treatment to determine P availability for plant uptake and risk for run-off. TD-treated soils retained more P, likely due to mineral transformations of Fe- and Al-oxides. In add

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18

Misra, Rabindra Kumar. "Root growth and phosphorus uptake in relation to soil structure and strength /." Title page, table of contents and summary only, 1986. http://web4.library.adelaide.edu.au/theses/09PH/09phm6781.pdf.

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19

Herman, Melissa C. "Laboratory Evaluation and Soil Test Phosphorus Trends in Ohio." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308336863.

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20

Cooperband, Leslie Rose. "Soil phosphorus dynamics in a humid tropical silvopastoral system /." The Ohio State University, 1992. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487777901660164.

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21

Fischer, Peter [Verfasser]. "The degree of phosphorus saturation of agricultural soils in Brazil and Germany: New approaches for risk assessment of diffuse phosphorus losses and soil phosphorus management / Peter Fischer." Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1185174141/34.

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22

Whitehead, Peter. "Phosphorus retention from dairy slurry in four grassland soils and release to soil solution." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250638.

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23

Shetterly, Benjamin James. "Soil Phosphorus Characterization and Vulnerability to Release in Urban Stormwater Bioretention Facilities." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4354.

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Modern urban stormwater infrastructure includes vegetated bioretention facilities (BRFs) that are designed to detain water and pollutants. Phosphorus (P) is a pollutant in stormwater which can be retained in BRF soils in mineral, plant, and microbial pools. We explored soil properties and phosphorus forms in the soils of 16 operational BRFs in Portland, OR. Since soil hydrology can significantly impact P retention, we selected BRFs along an infiltration rate (IR) gradient. We conducted sequential fractionation and tests of P pools and measured P release in a subset of soils after drying and fl

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24

Coyle, Kieran. "An investigation of the role of soil micro-organisms in phosphorus mobilisation : a report submitted to fulfil the requrements of the degree of Doctor of Philosophy." Title page, table of contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phc8814.pdf.

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25

Yokoyama, Daiki. "Significance of soil organic phosphorus for the maintenance of tropical rain forest ecosystems." Kyoto University, 2019. http://hdl.handle.net/2433/236631.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第21470号<br>農博第2313号<br>新制||農||1064(附属図書館)<br>学位論文||H31||N5165(農学部図書室)<br>京都大学大学院農学研究科地域環境科学専攻<br>(主査)教授北山兼弘, 教授本田与一, 教授舟川晋也<br>学位規則第4条第1項該当

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26

Ramwell, Carmel Teresa. "Nitrogen and phosphorus dynamics in upland peat." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245573.

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27

Landry, Christine. "Phosphorus fertilization and mycorrhizae influence soil phosphorus dynamics, corn nutrition and yield under reduced-tillage practices." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115705.

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Grain corn (Zea mays L.) production occupies more farmland than any other annual crop in Quebec and is expanding demand from the livestock sector and the emerging bioethanol industry. Corn production requires high nutrient inputs and intensive tillage (IT). Many producers have thus switched to conservation tillage systems like ridge-tillage (RT) to overcome soil compaction and erosion problems that are common in IT systems. However, fertilizer guidelines developed for IT soils are used in RT although RT adoption greatly modifies phosphorus (P) dynamics. Lower fertilizer P requirements are expe

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28

Silvertooth, J. C., E. R. Norton, and A. Galadima. "Evaluation of Potassium and Phosphorus Fertility in Arizona Soils." College of Agriculture, University of Arizona (Tucson, AZ), 2001. http://hdl.handle.net/10150/211298.

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Two field experiments were conducted during the 2000 growing season to address fertility recommendations for fertilizer phosphorus (P) and potassium (K). A K fertility study was conducted near Tonopah, AZ consisting of two treatments, an untreated control and a treatment receiving a total of 20 gallons of K-Sul/acre. No significant differences were observed in leaf blade K concentrations between treatments. Plant growth and development estimates revealed that fruit retention (FR) levels remained consistently higher in the untreated control versus the treated plots. A second study involved trea

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29

Alogaidi, Faez Fayad Mohammed. "Understanding rice and soil phosphorus interactions with an emphasis on rice genetics and soil microbes." Thesis, University of Aberdeen, 2013. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=203870.

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Rice is the staple food for nearly one half of the ever growing world's population. Phosphorus (P) deficiency commonly constrains crop productivity on a large area of arable land worldwide. P fertilizer is a finite resource and an expensive input, so it must be used efficiently. The main objective of this study was to investigate plant and soil P interaction in P deficient conditions and understand plant mechanisms that could enhance P uptake efficiency throughout two main research approaches: Firstly, investigating plant and soil microbes' interaction that promotes plant growth in Plimited co

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30

Ochwoh, Victor Akangah. "The dynamics of phosphorus extractability, adsorption, and desorption rates as influenced by phosphorus applications and incubation times." Thesis, University of Pretoria, 2002. http://hdl.handle.net/2263/28636.

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In a study to investigate the fate of the applied P in soils, a red-sandy clayey soil (Ferric Luvisols) from Rustenburg (high P fixing) and a red-sandy loam soil (Ferric Acrisols) from Loskop (low P fixing) were used. Sequential P fractionations were used to determine the content of the different P pools to show which pool the applied P was transformed to. The soils treatments consisted of different Prates (0, 25, 50, 100, 150, and 200 mg kg-1), and incubation periods (1, 60, 120, 180, and 240 days) under a laboratory conditions. The sequential P fractionation procedure consisted of extraction

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31

Leech, Fiona. "Influence of alternative fertilizers on pasture production, soil properties and soil microbial community structure." Thesis, The University of Sydney, 2019. https://hdl.handle.net/2123/21460.

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Alternative fertilizers are commonly promoted for use on pastures to improve productivity and support a more ‘healthy’ soil microbial environment. However, minimal field research has been conducted to validate such claims. A 6-year study (2009–14) was conducted on phosphorus (P) deficient soils at three sites near Yass, NSW, to investigate the effect of top-dressing native perennial grass-based pastures with a range of alternative fertilizers and with single superphosphate (SSP). The alternative fertilizers included manures, composts, concentrated ash, crushed rock, rock phosphate-derived and

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32

Deiss, Leonardo. "Soil Organic Phosphorus and carbon on agricultural and natural ecosystems." reponame:Repositório Institucional da UFPR, 2016. http://hdl.handle.net/1884/46044.

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Orientador : Dr. Anibal de Moraes, Dr Jeferson Dieckow e Dr. Alan J. Franzluebbers<br>Tese (doutorado) - Universidade Federal do Paraná, Setor de Ciências Agrárias, Programa de Pós-Graduação em Agronomia. Defesa: Curitiba, 24/10/2016<br>Inclui referências: f. 47-50;72-77;97-101<br>Área de concentração: Produção vegetal<br>Resumo: A disponibilidade de solos e seus recursos está reduzindo com a evolução da humanidade e os impactos negativos, decorrentes do mau uso dos solos, estão afetando o desenvolvimento sustentável da agropecuária mundial. Portanto, se faz necessário o desenvolvimento de alt

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33

Sommerville, David W. "Phosphorus fertilization : effects on asparagus yield, and soil microbial parameters." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80876.

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Asparagus (Asparagus officinalis) is a perennial crop well suited to grow in Quebec. Despite high demand for this crop, asparagus production is declining because of asparagus root rot disease that is caused by Fusarium spp. Phosphorus is one of the most important nutrients for the production of healthy asparagus roots that may resist infection by Fusarium. The objective of this study was to determine the effects of phosphorus (P) applications on asparagus yield and soil microbial parameters. Plots receiving 0 to 200% of the P recommendation, based on the Centre de reference en agricultu

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34

Shumaker, II Paul D. "INORGANIC AND ORGANIC PHOSPHORUS INTERACTIONS WITH HYDROXY-INTERLAYERED SOIL MINERALS." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/532.

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Phosphorus (P), a necessary plant and animal nutrient, can also lead to eutrophication of fresh waters when in excess. Appropriate P management is necessary to prevent fresh water pollution. Mineralogy of soil clays has been shown to affect P adsorption, desorption, and movement through soils. Specifically, hydroxy-interlayered minerals have been shown to adsorb and retain inorganic P in soil systems. This study was designed to determine the sorption and desorption characteristics of inorganic, organic, and mixed forms of P interacting with soil hydroxy-interlayered vermiculites (HIV) and smec

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35

Peat, Darren Michael William. "Modelling and monitoring of phosphorus transport and speciation in soil." Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/1270.

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Flow through soil into groundwater has been classically conceptualised as taking place through a set of aligned capillary tubes. In solute transport models these approximations are also present. Pore-Cor (a network model) has been used to model the void structure of soil by using water retention and mercury porosimetry curves. The model successfully predicts trends in saturated hydraulic conductivity. The effect of the assumptions used in the Pore-Cor geometry have been investigated by comparing of two dimensional slices of the simulated networks with two dimensional image analysis data. The g

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Yusran, Fadly Hairannoor. "Soil organic matter decomposition : effects of organic matter addition on phosphorus dynamics in lateritic soils." University of Western Australia. School of Earth and Geographical Sciences, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0120.

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[Truncated abstract] Relationships between the persistence of organic matter added to soil, the dynamics of soil organic carbon (C) and phosphorus (P) were examined in four experiments on lateritic soils of Western Australia. The main objective was to quantify the release of P following organic matter application in soils which have high P adsorbing capacity. Another objective was to confirm that due to its recalcitrant materials, the effect of peat lasted longer in soil than other sources of organic matter in terms of increasing plant-available P fractions. Three experiments were conducted u

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Makris, Konstantinos Christos. "SOIL AND COLLOIDAL PHOSPHORUS DYNAMICS IN THREE KY SOILS: BIOAVAILABILITY, TRANSPORT AND WATER QUALITY IMPLICATIONS." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_theses/408.

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Particulate P constitutes a significant portion of the total P found in surface runoff water. Water dispersed P-containing particles can travel long distances via surface runoff and reach water bodies causing decrease in water quality. The main objective of the study was to evaluate the potential facilitation of P transport by the water dispersed soil colloids (WDC) using three KY soils with a long-term record of poultry manure, and fertilizer P applications. Sequential fractionation for both whole soils and colloidal samples revealed that the WDC had a greater total and labile P content than

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Ron, Vaz Maria Dolores. "Characterization of phosphorus in solutions from temperate soils." Thesis, University of Aberdeen, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261327.

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An analytical protocol for the determination of various soluble P fractions, namely: total dissolved P (TDP), dissolved reactive P (DRP), dissolved organic P (DOP) and dissolved condensed P (DCP) has been developed. The determination of DOP in soil solutions and water extracts was achieved by an improved automated photo-oxidation procedure, in which possible interferences caused by aluminium have been overcome. Partitioning of TDP into DRP, DOP and DCP fractions increased our understanding of P cycling in temperate soils. A combination of field and laboratory studies indicated that management

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Unruh, B. L., J. C. Silvertooth, A. J. Steger, and E. R. Norton. "Nitrogen, Phosphorus, and Potassium Uptake by Upland and Pima Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 1994. http://hdl.handle.net/10150/209649.

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Several investigations of nitrogen (N), phosphorus (P), and potassium (K) uptake by Upland cotton (Gossypium hirsutum L.) have been conduced, however no investigations of this type have included American Pima cotton (G. barbadense L.). We conducted a study to describe the total N, P, and K uptake and the partitioning of each nutrient into various plant parts for both Upland and Pima cotton. During the growing seasons of 1990, 1991, and 1992 at two south-central Arizona locations, both Upland (var. DPL 90) and Pima (var. S-6) cotton were grown. Beginning 14 to 20 d after emergence, whole cotton

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40

Thelander, A. S., and J. C. Silvertooth. "Soil Test Calibration Evaluations for Phosphorus on Upland and Pima Cotton." College of Agriculture, University of Arizona (Tucson, AZ), 2000. http://hdl.handle.net/10150/197512.

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Numerous field experiments were conducted at a wide range of sites in Arizona from 1988 through 1999 involving phosphate (P) fertilization of cotton (Gossypium spp.). A total of 21 site-years were used to study the effects of P on both Upland (G. hirsutum L.) and Pima (G. barbadense L.) varieties. The purpose of these experiments was to evaluate University of Arizona (UA) soil fertility guidelines with respect to soil test results (NaHCO3 extractable P) and to possibly fine-tune or calibrate these guidelines in relation to soil test P, applied P, and yield for common Arizona soils used in cott

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41

SanClements, Michael. "The Chemistry of Acidic Soils in Humid, Temperate Forested Watersheds with Emphasis on Phosphorus, Aluminum and Iron." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/SanClementsM2009.pdf.

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42

Turner, Benjamin Luke. "Solubilisation and leaching of phosphorus from grassland soils with particular reference to the role of biological mechanisms and organic phosphorus." Thesis, University of London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367889.

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43

Nieuwenhuis, Jenifer M. "Nitrogen and phosphorus modification within a petroleum contaminated biopile at the Oneida County Sanitary Landfill /." Link to abstract, 2004. http://epapers.uwsp.edu/abstracts/2004/Nieuwenhuis.pdf.

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44

Esberg, Camilla. "Phosphorus availability and microbial respiration across biomes from plantation forest to tundra /." Doctoral thesis, Umeå : Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-33732.

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45

Casteel, Shaun Nathan. "Phosphorus Dynamics from Broiler Breeder Diets in Manure, Soil, and Corn." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-04232009-112606/.

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Abstract (sommario):

Studies of broiler breeder diet modifications to reduce phosphorus (P) excretion have evaluated bird performance, but no studies have quantified the effects of P in the manure and the impacts to soil and plant availability once soil-applied. Four diets were formulated by factoring two levels, 0.40 and 0.22% available P (NRC, Low, respectively), with or without phytase during the breeder laying phase (wk 22 to 64). Breeders fed phytase produced manures with 15% lower total P concentration, but did not change manure water-soluble P (WSP). However, P in the breeder manures was > 92% orthophosphat

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46

Gowing, David. "High soil phosphorus availability and the restoration of species-rich grassland." Thesis, Cranfield University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397456.

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47

Massey, Paul Andrew. "Interactions between phosphorus fertilisation and soil biota in managed grasslands systems." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7844.

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Abstract (sommario):

The application of phosphorus (P) fertilisers to grassland systems is a common practice to increase and sustain grassland productivity. This is requisite for satisfying the nutritional needs of grazing animals and increasing dairy and livestock output. The costs of such fertilisers are increasing and the demands for such fertiliser will also most likely rise following governmental targets set in Ireland to increase national agricultural output. However, the application of P fertiliser to grassland systems can contribute to the eutrophication of water-courses, since fertiliser applications can

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48

Peters, Anna L. "The Effects of Soil Phosphorus on Acer rubrum Fecundity." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1398164024.

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49

Seiler, Lauren Katherine Kaye Jason P. "Exploring potential soil phosphorus movement in four organic agriculture forage systems." [University Park, Pa.] : Pennsylvania State University, 2009. http://honors.libraries.psu.edu/theses/approved/WorldWideIndex/EHT-44/index.html.

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50

Notodarmojo, Suprihanto. "Modelling phosphorus transport in soil and groundwater with two consecutive reactions." Thesis, Notodarmojo, Suprihanto (1992) Modelling phosphorus transport in soil and groundwater with two consecutive reactions. PhD thesis, Murdoch University, 1992. https://researchrepository.murdoch.edu.au/id/eprint/51421/.

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Abstract (sommario):

A one-dimensional model of phosphorus transport in soils and groundwater applicable for steady state or transient unsaturated waterflow conditions has been developed. Convective transport, hydrodynamic dispersion and time-dependent phosphorus sorption are accounted for in the model formulation. Time-dependent sorption of phosphorus is considered to follow the empirical model of Barrow and Shaw (1979), which can be described by S = k.Cnt.m The assumed sorption model allows model parameters to be obtained by independent batch and column experiments. Numerical techniques were used to solve t

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