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Dissertations / Theses on the topic 'Soils Phosphorus content'

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Published: 4 June 2021

Last updated: 26 January 2023

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1

Zhang, Tiequan. "Chemical behavior of phosphorus over time in fertilized soils." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34486.

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Fertilizer P accumulates in soils, with potential for movement to waterways, causing eutrophication. Fertilizer P reactions in monoculture corn (Zea mays L.) production over time will determine environmentally sound soil management practices. Soil P changes over time were determined on a Chicot sandy clay loam (Grey Brown Luvisol) and a Ste. Rosalie clay (Humic Gleysol). Fertilizer P was added at 44 and 132 kg P ha$ sp{-1}$ and to the Chicot soil only, manure containing 60 kg P for the first five years. Mehlich-3 (M3) extraction, soil P fractionation, $ sp{31}$P NMR analysis, P in leaching wat

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2

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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3

Gichangi, Elias Maina. "Enhancing phosphorus availability in some phosphate fixing soils of the Transkei region, South Africa using goat manure." Thesis, University of Fort Hare, 2007. http://hdl.handle.net/10353/80.

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Low availability of soil phosphorus (P) caused by strong sorption of P is a major constraint to agricultural production in most South African soils, particularly those from the high rainfall areas. The aim of this study was therefore to investigate whether combined addition of goat manure with inorganic P fertilizers could enhance P availability in some P fixing soils of the Transkei region, South Africa. The study addressed the following specific objectives (i) to assess P sorption capacities and requirements of selected soils and their relationship with selected soil properties and single po

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4

Leung, Miu-fun, and 梁妙芬. "Persistence of {221}-propeller phytase in soil and its implication in phosphorus mobilization." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30736511.

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5

Stewart, Lynda Irene. "Phosphorus effects on arbuscular mycorrhizal fungi." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102729.

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Two field studies were conducted to assess the potential benefit of arbuscular mycorrhizal (AM) inoculation of elite strawberry plants on plant multiplication, and fruit yield, under typical nursery conditions, in particular soils classified as excessively rich in P. To study plant productivity, five commercially in vitro propagated elite strawberry cultivars ('Chambly', 'Glooscap', 'Joliette', 'Kent', and 'Sweet Charlie') were not inoculated with AM fungi or were inoculated with either a single species (Glomus intraradices), or a mixture of species (G. intraradices, Glomus mosseae, and Glomus

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6

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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7

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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8

Kathuli, Peter. "The effects of 40 years of cultivation on organic phosphorus in a highly organic soil of south western British Columbia." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29034.

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The effects of 40 years of integrated field management on soil organic phosphorus and its forms was evaluated on a highly organic B.C. soil supporting high value vegetable crops. This project was undertaken to study the effects of cultivation on the soil content of organic phosphorus, as a predictor of overall degradation effects of the soil organic matter. Organic carbon, total nitrogen, soil pH and total and inorganic phosphorus were also evaluated, due to the strong relationship of organic P and these other soil chemical properties. The forms of organic P that were evaluated were the phytic

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9

Piper, Allison. "Root Length Affects Soluble Carbon and Phosphorus in a Rotational Cropping System." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/PiperA2005.pdf.

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10

Ouyang, Duosheng. "New fertilizer combinations for improved nitrogen and phosphorus use efficiency and reduced environmental damage in corn production." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0004/NQ30353.pdf.

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11

Xie, Xinghua. "Effects of ammonium lignosulphonate and diammonium phosphate on soil organic matter, phosphorous fractions and corn (Zea mays L.) yield in two eastern Canadian soils." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56811.

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Phosphorous fertilizer has an efficiency of about 10 percent, and this efficiency must be improved, in order to avoid excessive loss of a non-renewable resource. Ammonium lignosulphonate (ALS), a by-product of the pulp and paper industry, is expected to improve efficiency of fertilizer phosphate (P) for corn (Zea mays L.) production. Field experiments were conducted to investigate effects of added ALS and P on soil organic matter and P fractions, as well as corn yields and nutrient uptake in a Ste. Rosalie clay soil and an Ormstown silty clay loam soil in 1990 and 1991. Incubation studies show

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12

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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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

Liu, Aiguo 1949. "Mycorrhizal symbiosis and nutrient uptake in new maize hybrids with contrasting phenotypes as influenced by soil phosphorus level." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36820.

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Development and functioning of arbuscular mycorrhizal (AM) symbiosis in the soil-plant system are required in sustainable agriculture. AM development of maize genotypes and uptake of nutrients as influenced by soil P levels were studied. Several experiments were conducted both in the greenhouse and in the field.<br>In greenhouse trials, pasteurized substrates were inoculated with Glomus intraradices as mycorrhizal treatments. Mycorrhizal development varied widely among maize hybrids and inbreds. Leafy normal stature (LNS) had the highest root colonization and shoot:root ratio and was the most

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15

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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16

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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17

Medina-Ross, Jose Antonio. "Study on phosphorus desorption and availability to soybean (Glycine max L.) in two phosphorus rich Gleysolic soils under different tillage and fertilization practices." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21609.

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Soil phosphate is essential for the development and maturity of crops. Plants absorb phosphate from the soil solution which is continuously replenished by fertilizer application and/or desorption from the soil solid phase. Anion exchange membranes (AEMs), act in a similar way to plant roots, adsorbing P from soil solution. Desorption of available P was studied in 1997 on two Gleysolic soils rich in P, a Ste. Rosalie clay soil and a Duravin sandy loam soil, using fluoride-saturated AEMs let in soil suspension for various contact periods. Determination of available P using these AEMs was compare

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18

Lukhele, Nomagugu Precious. "Site-specific environmental risk assessment for phosphorus runoff." Thesis, University of Limpopo, 2014. http://hdl.handle.net/10386/1291.

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Thesis (MSc. Agriculture (Soil Science)) -- University of Limpopo, 2014<br>Phosphorus (P) runoff from agricultural sites and the subsequent loading into surface water bodies contribute to eutrophication. Environmental concerns associated with P loading in soil have motivated the need for the development of a proper tool that will allow farmers to identify agricultural areas or management practices that have the greatest potential to accelerate eutrophication. The objective of the study was to determine the spatial variability of soil test P, soil loss potential of the farm, P application

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19

Sigrist, Andrew B. (Andrew Bernard). "Influence of incubating liquid hog manure and monocalcium phosphate on phosphorus availability and fractionation." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69518.

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Incubation mixtures of liquid hog manure (LHM), with and without monocalcium phosphate (MCP) were added to an Ormstown silty clay loam and a Ste. Rosalie clay. Ryegrass (Lolium multiflorum Lam.) was cultivated in a pot study in order to determine yield, total P uptake and soil P content as affected by various P and manure treatments.<br>Aeration of LHM with MCP was successful in reducing ammonia volatilization by 62.4%. However, for both soils, neither of the treatments; LHM amended and aerated with MCP and applied at 32 t ha$ sp{-1}$ LHM containing 513 kg $ rm P sb2O sb5 ha sp{-1}$ from MCP n

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20

George, Suman Jacob. "Effects of land-use change on phosphorus forms in South-West Australian soils." University of Western Australia. School of Earth and Geographical Sciences, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0078.

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[Truncated abstract] Eleven sites, each with the trio of land uses: Eucalyptus globulus plantation, pasture and natural vegetation, representing from the Mediterranean climate, high rainfall region (<550 mm annually) of south-western Australia were investigated to assess medium-term changes in the P-supplying capacity of soils in eucalypt plantations growing on agricultural land. The natural vegetation soils were a benchmark for comparing soil P change since land clearing and development for agriculture. The experimental framework provided an ideal basis for studying changes in P forms since

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21

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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22

Turgeon, Julie. "Production and biodegradation of dissolved carbon, nitrogen and phosphorus from Canadian forest floors." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115710.

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Dissolved organic matter (DOM) is operationally defined as soluble/colloidal material passing through a 0.45mum filter paper. The importance of DOM in soils relies on its role in soil formation and weathering processes, plant and microbial assimilation and soil and water acidification. However, the scientific community studying DOM still disagrees on whether fresh or humified material is the major source of DOM within the forest floor. One of the factors that could influence the overall importance of DOM production by organic horizons is its potential for biodegradability. In addition, the int

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23

Stämpfli, Nicolas. "The effect of water table management on the migration of phosphorus and on grain corn yields." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19763.

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Due to recent research suggesting that water table management (WTM) can significantly reduce nitrate (NO3") loads in agricultural drainage, a study was carried out in 2001 and 2002 in Coteau-du-Lac, 60 km west of Montreal, to investigate the effect of water table management on the migration of phosphorus (P) via tile drainage and surface runoff. The second main objective was to study the influence of WTM on grain corn yields. Two drainage treatments were compared: conventional free drainage and WTM (combined controlled drainage and subirrigation) with a design water table depth at 0.6 m below

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24

Nuruzzaman, Mohammad. "Phosphorus benefits of white lupin, field pea and faba bean to wheat production in Western Australian soils." University of Western Australia. School of Plant Biology, 2005. http://theses.library.uwa.edu.au/adt-WU2005.0094.

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[Truncated abstract] Soils of Western Australian cropping regions are very low in phosphorous. White lupin, chickpea, and faba bean are being increasingly used in rotations with wheat on these soils. Yield of wheat after a legume crop is frequently higher than its yield after wheat. It has been reported that in addition to nitrogen, legumes can also contribute to improve the availability of phosphorous for the subsequent crops. This PhD research project aimed at optimising the economic returns of wheat-legume rotations through more efficient use of P fertiliser in the legume phase as wel

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25

MacDonald, Tim. "The effects of excessive liquid hog manure applications on phosphorus concentrations in soil and surface runoff from corn and forage crops." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0033/MQ64398.pdf.

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26

Simpson, Lisa G. "Impact of long-term manure application on soil macronutrient levels in Southern Alberta." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Geography, c2010, 2010. http://hdl.handle.net/10133/3098.

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The role of manure applications on soil nutrient dynamics in years after manure applications cease has not been extensively studied. An investigation of two long-term manure trials in the Battersea Drain watershed in southern Alberta was undertaken in 2004 to determine changes in soil nutrient status three years after the initial study was completed. The investigation of the nutrient status of an intensive livestock operation was another component of the study. There was a significant decrease in levels of soil nitrogen, phosphorus and potassium in the plots that received manure application

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27

Mutter, Rodney N. "An assessment of cropland application of alum sludge." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07212009-040409/.

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28

Turgeon, Julie. "Production and Biodegradation of Dissolved Carbon, Nitrogen and Phosphorous from Canadian Forest Floors." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=105310.

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Dissolved organic matter (DOM) is operationally defined as soluble/colloidal material passing through a 0.45~m filter paper. The importance of DOM in soils relies on its role in soil formation and weathering processes, plant and microbial assimilation and soil and water acidification. However, the scientific community studying DOM still disagrees on whether fresh or humified material is the major source of DOM within the forest floor.[...]<br>La matière organique dissoute (DOM) est composée de particules dissoutes et colloïdales passant au travers un filtre de 0.45 Ilm. L'importance de DOM dan

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29

Cosme, Marco Paulo Rebeca. "Effects of interaction between arbuscular mycorrhizal fungi, rhizobacteria, soil phosphorus and plant cytokinin content on tobacco growth." Master's thesis, ISA, 2010. http://hdl.handle.net/10400.5/15193.

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Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia<br>A rizosfera é uma zona importante em termos de actividade e diversidade microbiana, onde ocorrem associações benéficas entre plantas e microorganismos, e é fundamental na produção agrícola. Ao proliferarem num meio complexo e heterogéneo como o solo, as raízes desenvolvem-se de forma estruturada, mas flexível, por forma a optimizar suas funções. Factores endógenos, como fisiologia e genética da planta, bem como factores exógenos abióticos e bióticos são elementos determinantes. Neste estudo propo

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30

Novais, Sarah Vieira. "Desgaste dos extratores Mehlich-1 e Fosfato Monocálcico e fatores que controlam a solubilização do fosfato de Bayóvar." Universidade Federal de Viçosa, 2014. http://locus.ufv.br/handle/123456789/5538.

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Made available in DSpace on 2015-03-26T13:53:35Z (GMT). No. of bitstreams: 1 texto completo.pdf: 615488 bytes, checksum: 625e0d53d08b1efc7faa6681cabab74c (MD5) Previous issue date: 2014-07-07<br>The low availability of phosphorus (P) in tropical soils makes it one of the most studied plant nutrients in the world. Phosphorus fertilization is essential for economically satisfactory yields and the assessment of its long-term availability has become indispensable for the management of this nutrient in agricultural systems. This study was based on two experiments: experiment I, to evaluate the we

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31

Claycomb, Peter T. "Measurement of microbial biomass phosphorus in Oregon soils." Thesis, 1992. http://hdl.handle.net/1957/37135.

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32

Mayakaduwage, Sonia Samanthi. "Influence of pH, phosphorus addition and soil water content on phosphorus pools in acid sulfate soils." Thesis, 2020. http://hdl.handle.net/2440/128818.

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Acid sulfate soils (ASS) are common in wetlands and important for crop production. However, little is known about P availability in ASS which is constrained due to high Fe content and changing redox potential. This thesis aimed to investigate the effect of P addition, pH and soil water content on P pools in ASS. A sandy sulfuric ASS (pH 3.2) was used in the experiments. In the first experiment, the ASS was amended with NaOH or Ca(OH)2) to achieve soil pH 4 or 5.5, without or with addition of inorganic P equivalent to 20 kg ha−1. Soils were incubated in either submerged or moist conditions (100

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33

"Nitrogen and phosphorus dynamics in Hong Kong urban park soils." 2005. http://library.cuhk.edu.hk/record=b5892382.

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Liu Wing Ting.<br>Thesis submitted in: November 2004.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2005.<br>Includes bibliographical references (leaves 141-156).<br>Abstracts in English and Chinese.<br>Abstract (English) --- p.i<br>Abstract (Chinese) --- p.iii<br>Acknowledgments --- p.v<br>List of Tables --- p.vii<br>List of Figures --- p.ix<br>List of Plates --- p.x<br>List of Appendices --- p.xi<br>Chapter CHAPTER 1 --- INTRODUCTION<br>Chapter 1.1 --- Urban ecological environment and the urban parks in Hong Kong --- p.1<br>Chapter 1.2 --- Conceptual framework of the study --

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34

Mokolobate, Motlogeloa Salathiel. "An evaluation of the use of organic amandments to ameliorate aluminium toxicity and phosphorus deficiency in an acid soil." Thesis, 2000. http://hdl.handle.net/10413/4952.

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The effects of the additions of some commonly-available organic residues to an acid, P-deficient soil (typical of those used by small-scale farmers in KwaZulu-Natal) on soil pH, exchangeable and soil solution AI, P availability and maize yield response was investigated in a number of laboratory and glasshouse experiments. The organic amendments used were ground-up grassveld residues, household compost, filter cake (a waste product from a sugar mill) and layer poultry manure. The soil used was a Hutton form (Farmingham series) (Rhodic Ferrasol, FAO). In an initial laboratory study, addition of

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35

Nelson, Sheila J. "The influence of phosphatase-producing bacteria on phosphatase activity and available phosphorus in soil." Thesis, 1991. http://hdl.handle.net/1957/36590.

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Iyamuremye, Faustin. "Effects of organic and inorganic soil amendments of phosphorus sorption." Thesis, 1994. http://hdl.handle.net/1957/35679.

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Norris, Matthew. "Phosphorus sorption behaviour of some South African water treatment residues." Thesis, 2009. http://hdl.handle.net/10413/673.

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Coyle, Kieran. "An investigation of the role of soil micro-organisms in phosphorus mobilisation : a report submitted to fulfil the requirements of the degree of Doctor of Philosophy / Kieran Coyle." 2001. http://hdl.handle.net/2440/21787.

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"September 2001"<br>Includes bibliographical references (leaves 206-230)<br>xviii, 230 leaves : ill., plates ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Agronomy and Farming Systems, 2002

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Coyle, Kieran. "An investigation of the role of soil micro-organisms in phosphorus mobilisation : a report submitted to fulfil the requirements of the degree of Doctor of Philosophy / Kieran Coyle." Thesis, 2001. http://hdl.handle.net/2440/21787.

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"September 2001"<br>Includes bibliographical references (leaves 206-230)<br>xviii, 230 leaves : ill., plates ; 30 cm.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Agronomy and Farming Systems, 2002

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Matlou, Mmakgabo Cordelia. "A comparison of soil and foliar-applied silicon on nutrient availability and plant growth and soil-applied silicon on phosphorus availability." Thesis, 2006. http://hdl.handle.net/10413/3468.

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A greenhouse study was carried out to investigate the effectiveness of soil-applied silicon (Si) with that of foliar applications for sorghum growth. Silicon sources were soil-applied as calmasil (calcium silicate) at two rates (4 and 8t/ha) and foliar applied Si including pure K-silicate, K-humate and K-fulvate (all three foliar treatments at rates of 300 and 600 ppm). Another treatment included soil applied calmasil plus low rate of foliar applied K-humate. The soils used for the greenhouse trial were Cartref, Glenrosa, Nomanci and Fernwood. Results indicated that application of calcium sili

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41

Brooks, Anna. "Effects of phosphorus nutrition on photosynthetic metabolism of spinach leaves." Phd thesis, 1985. http://hdl.handle.net/1885/140654.

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Miles, Neil. "Pasture responses to lime and phosphorus on acid soils in Natal." Thesis, 1986. http://hdl.handle.net/10413/9621.

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"Simulation study on the effects of heat and ash on a frequently burnt soil in Hong Kong." 2005. http://library.cuhk.edu.hk/record=b5892332.

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Lam Lai-yee.<br>Thesis submitted in: November 2004.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2005.<br>Includes bibliographical references (leaves 124-140).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>Acknowledgement --- p.vii<br>Table of contents --- p.viii<br>List of Tables --- p.xi<br>List of Figures --- p.xiii<br>List of Plates --- p.xiv<br>Chapter CHAPTER ONE --- Introduction<br>Chapter 1.1 --- Introduction --- p.1<br>Chapter 1.2 --- Background and ecological impact of hill fires in Hong Kong --- p.2<br>Chapter 1.3 --- Conceptual framework of study ---

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Hayes, Julie Ellen. "Phytate as a source of phosphorus for the nutrition of pasture plants." Phd thesis, 1999. http://hdl.handle.net/1885/148002.

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"Phosphorus retention and release characteristics of wetland sediments in Hong Kong." 2007. http://library.cuhk.edu.hk/record=b5893199.

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Lai, Yuk Fo.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2007.<br>Includes bibliographical references (leaves 169-191).<br>Abstracts in English and Chinese.<br>Abstract --- p.i<br>Abstract (in Chinese) --- p.iv<br>Dedication --- p.v<br>Acknowledgement --- p.vi<br>Table of contents --- p.viii<br>List of tables --- p.xii<br>List of figures --- p.xiii<br>List of plates --- p.xv<br>List of symbols and abbreviations --- p.xvi<br>Chapter Chapter One --- Introduction<br>Chapter 1.1 --- Introduction --- p.1<br>Chapter 1.2 --- Research background --- p.1<br>Chapter 1.2.1 --- Wetlan

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Herbert, Darrell Anthony. "Primary productivity and resource use in Metrosideros polymorpha forest as influenced by nutrient availability and Hurricane Iniki." Thesis, 1995. http://hdl.handle.net/10125/9272.

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Majaule, Ugele. "Phosphorous dynamics in soils under contrasting long-term agricultural management practices in the KwaZulu-Natal midlands." Thesis, 2006. http://hdl.handle.net/10413/3457.

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Little is known regarding the effects of land use on soil organic matter and P status of South African soils. For that reason, the effects of the main agricultural land uses in the midlands region of KwaZulu-Natal [maize (Zea mays), sugarcane (Saccharum spp), annual ryegrass pasture (Lolium multiflorum), permanent kikuyu pasture (Pennisetum clandestnum), gum (Eucalyptus grandis) and pine (Pinus patula)] on soil organic matter content, microbial biomass C and P and inorganic and organic P pools derived from a modified Hedley P fractionation was investigated on two sites where the longterm histo

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Maphoto, Patrina Nare. "Response of growth, yield and root characteristics of a determinate cowpea variety to variable phosphorus fertiliser and lime application rates." Thesis, 2018. http://hdl.handle.net/10386/2243.

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Thesis (MSc. Agriculture(Soil Science) -- University of Limpopo, 2018<br>Soil acidity is one of the abiotic stress factors that greatly limit the productivity of crops on farmers’ fields. A greenhouse study was carried out over two summer growing seasons to evaluate the effect of lime and phosphorus (P) application rates on the growth, yield and root attributes of a determinate cowpea variety on acid soil. The experiment was laid out as a 4x5 factorial arrangement with 4 replications. Treatment factors comprised of variable rates of Vaalburg dolomitic lime (0, 2, 4 and 6 t ha-1) and P (0, 15,

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Leytem, Alicia B. "Response of Striga-susceptible and Striga-resistant sorghum genotypes to soil phosphorus and colonization by an arbuscular mycorrhizal fungus." Thesis, 2012. http://hdl.handle.net/1957/29486.

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Striga, a genus of obligate parasitic weeds in the family Orobanchaceae, has been identified as the most important biological factor limiting agricultural productivity in sub-Saharan Africa. Germination of Striga seeds is triggered by strigolactone root exudates from host plants. Strigolactones also induce hyphal branching in arbuscular mycorrhizal (AM) fungi, which are important for plant uptake of phosphorus in low phosphorus soils. Mechanisms of Striga resistance based on reduced strigolactone production may also convey resistance to AM fungi which would require higher inputs of phosphorus

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Liu, Qianhe. "Rhizosphere processes influencing soil and fertilizer phosphorus availability to Pinus radiata : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Soil Science at Massey University, Palmerston North, New Zealand." 2005. http://hdl.handle.net/10179/1669.

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Production of Pinus radiata is a major contributor to New Zealand's economy and new plantings are a valuable carbon sink. Phosphorus (P) deficiency and high P fixing capacity of some volcanic ash soils (e.g. Allophanic Soil) may constrain radiata productivity. This thesis investigates the role of ectomycorrhizal (ECM) root processes in the acquisition of P by P. radiata fiom native soil and soil fertilised with two reactive phosphate rock (RPR) fertilisers. The application of finely-divided RPRs to a P deficient Allophanic Soil significantly increased P. radiata seedling growth and P uptake in

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