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Dissertations / Theses on the topic 'Nutrient amendments'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Bazza, Zineb. "Soil amendments from urban residuals and their effect on crop productivity and nutrient cycling." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63222.

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Urban residuals have been used in agriculture to decrease disposal costs, recycle nutrients, and prevent or counteract the degradation of soils linked to the intensification of agriculture. Technological advancements continue to produce novel residuals that can be used as soil amendments, with the potential to reduce or eliminate waste. This thesis entails two studies that examine the potential to utilize new urban residuals for food production. The objectives of the first study were to look at the potential benefits and impacts, on crop productivity and nutrient cycling, of using monopotassiu

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2

Ogunniyi, Jumoke Esther. "Effects of clay and organic matter amendments on water and nutrient retention of sandy soils." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/101514/.

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Sandy soils are one of the most widely distributed soils in the world. However, crop production on these soils can be problematic especially in terms of water and nutrient retention. In the face of climate change and a projected reduction in water availability, food production is likely to be particularly affected. The aim of this research is to examine if amending soils with clay and organic matter can improve their water and nutrient retention. The research approach employed laboratory column leaching experiments, rainfall simulation, Computed Tomography (CT) scanning and field trials to inv

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3

Oriaku, Timi Otegha. "The impact of nutrient and biodiesel amendments on the biodegradation of hydrocarbons in contaminated soil." Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2345.

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The effect of nutrient, biodiesel and biochar amendments on the biodegradation of pollutant hydrocarbons was investigated in soil spiked with crude oil and coal tar over periods of up to 180 days. Biodiesel was chosen as an amendment for increasing the bioavailability of hydrocarbon pollutants because of its good solvent properties but low toxicity. Results from laboratory microcosm experiments on soil spiked with weathered and un-weathered tar showed that after 60 days, the concentrations of the potent carcinogen benzo[a]pyrene (BaP) were significantly reduced by 92 and 81%, respectively, in

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4

Pennie, Kimberley Adele. "An investigation of the effects of nutrient amendments on PAH degradation in an aged creosote contaminated soil." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0008/MQ60684.pdf.

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5

Handest, Joshua A. "Effects of Nutrient Amendments and Genotype on StandProductivity and Crown Characteristics in Loblolly Pine(Pinus taeda L.)." NCSU, 2002. http://www.lib.ncsu.edu/theses/available/etd-20020104-155704.

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<p>Handest, Joshua A. Effects of Nutrient Amendments and Genotype on Stand Productivity andCrown Characteristics in Loblolly Pine (Pinus taeda L.) (Under the direction of H. Lee Allen andSteven E. McKeand).Two provenances of loblolly pine, with five open-pollinated families from each were analyzed fordifferences in height, volume, leaf area, and various crown characteristics. Families from theNorth Carolina and South Carolina Coastal Plain (ACP) and from the ?Lost-Pines? area of Texas(LPT) were included in the study. In addition to studying potential genetic variation, half of theplots receive

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6

Atallah, Therese. "Studies on the effects of organic amendments on nutrient recycling and nitrogen supply in a biological approach to crop production." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364054.

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7

Miller, Elisa Madeleine. "Fire mitigation and exotic species invasions in the Front Range: Responses of soil and vegetation to woodchip amendments in thinned forest, across a gradient of experimentally-manipulated nutrient availability." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3315813.

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8

van, Duijnen Richard Bert [Verfasser], Vicky M. [Gutachter] Temperton, Werner [Gutachter] Härdtle, and Michael [Gutachter] Bonkowski. "Improving agricultural nutrient use efficiencies: effects of crop rotation, high carbon amendments and fertilizer application timing on barley / Richard Bert van Duijnen ; Gutachter: Vicky M. Temperton, Werner Härdtle, Michael Bonkowski." Lüneburg : Leuphana Universität Lüneburg, 2021. http://d-nb.info/1230628363/34.

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9

Mesquita, Sara Raquel Amaral. "Biochar amendment as a strategy to reduce hydric stress in Eucalyptus." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14041.

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Mestrado em Biologia Aplicada<br>Atmospheric CO2 concentrations are higher than any time in the last decades, resulting in global warming along with general climactic changes. Drought stress is one of the most important effect of climactic alterations and directly disrupts water and carbon fluxes, with effects on primary production and terrestrial ecosystems equilibrium. It affects plants at different levels depending on intensity, duration and progression of drought, leading to responses at physiological, biochemical and molecular levels. The biochar application to the soils as a mitigation a

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10

Thuesen, Kevin (Kevin Andrew). "The Effects of Organic Surface Amendments on Soil Nutrients and Initial Tree Establishment." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc277585/.

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This study examined the effects of replicating woodland soil surface horizonation on the nutrient status of underlying soils and the initial establishment and growth of trees. A total of 283 container grown trees were planted in a bufferzone around a future landfill site. Control amendments consisted of an 8 cm layer (0.5 m3) of wood chips applied in a circular area of 4.6 m2 around the trees' planting pit. For the treatment, a 2.5 cm layer of composted biosolids (0.15 m3 or 80 Mg/ha) was applied in a circular area of 4.6 m2 around the trees' planting pit followed by an 8 cm layer (0.5 m3) of

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11

Goldschmidt, Alicia M. "Biochar Amendment of Green Roof Substrate: Effect on Vegetation, Nutrient Retention, and Hydrologic Performance." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535372571339002.

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12

Khosa, Mbokota Candy. "An investigation into the potential of crude and partially separated material of selected non-crop plant species as control agents of root-knot nematodes (Meloidogyne incognita) in tomato / Mbokota Candy Khosa." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8705.

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Plant-parasitic nematodes (PPN) are a serious problem in vegetable production and can cause severe damage to several crops. In rural, low-input farming nematode damage is much higher and yields can be completely destroyed. Some Commercial nematicides have been withdrawn from the market due to health and environment concerns. These need to be replaced by alternative nematode control strategies of which soil amendments is one alternative. Nine non-crop plant species used in various forms in traditional healing, viz. Cassia abbreviata, Cissus cactiformis, Euphorbia ingens, Ipomoea kituiensis, Mae

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13

Wilson, John A. L. "Microbial community structure and dynamics in the Colne Estuary, in situ and in response to nutrient amendment." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555229.

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Coastal sediments are major sites for microbially-mediated nitrate reduction, In particular denitrification. Estuarine sediments are prime locations for this process due to anthropogenic ally generated nitrate pollution from agricultural sources and wastewater treatment plants. The Colne estuary (UK) is one such hypernutrified estuary, receiving significant inputs of nitrate and ammonium. Rates of denitrification have been previously characterised along the estuary and found to be highest at the estuary head and lowest at the mouth. The aim of this current study was to investigate spatial and

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14

Roberts, Jesse Allen. "Mine soil genesis and tall fescue nutrient status as a function of overburden type and cultural amendment." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91065.

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Natural soils in the Appalachian coal mining region occur on steep slopes and are often thin, rocky, acidic, and/or infertile. This often makes use of natural topsoil for surface coal mine reclamation impractical. Sandstone (SS) and siltstone (SiS) topsoil substitute materials in mixed and pure treatments were compared to ascertain their effects on soil genesis and tall fescue (Festuca arundinaceae Schrab.) growth in a rock mix study. A second surface amendment experiment with similar objectives was established and contained treatments of sawdust, topsoil, a control, and four rates of sewage s

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15

Gebhardt, Martha Mary. "Soil Amendment Effects on Degraded Soils and Consequences for Plant Growth and Soil Microbial Communities." Thesis, The University of Arizona, 2015. http://hdl.handle.net/10150/556614.

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Human activities that disrupt soil properties are fundamentally changing ecosystems. Soil degradation decreases microbial abundance and activity, leading to changes in nutrient availability, soil organic matter, and plant growth and establishment. Land use and land cover change are widespread and increasing in semiarid regions of the southwestern US, which results in reductions of native plant and microbial abundance and community diversity. Here we studied the effects of soil degradation and amendments (biochar and woodchips) on microbial activity, soil carbon and nitrogen availability, and p

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16

Walia, Maninder Kaur. "GYPSUM AND CARBON AMENDMENT’S INFLUENCE ON SOIL PROPERTIES, GREENHOUSE GAS EMISSIONS, GROWTH AND NUTRIENT UPTAKE OF RYEGRASS (Lolium perenne)." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437140322.

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17

Reppun, Frederick A. W. L. "Invasive Marine Algae as a Soil Amendment for Island Farmers: Agronomic and Ethnographic Assessment of Implications for Nutrient Management." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1462555252.

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18

Willich, Melanie [Verfasser]. "Leaching of Carbon and Nutrients on a Subtropical Sandy Soil from Northern Oman - A Comparison of Methods and Amendments / Melanie Willich." Kassel : Universitätsbibliothek Kassel, 2014. http://d-nb.info/1061014924/34.

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19

Olofsson, Madelen. "On the investigation of chemical parameters reflecting microbial activity linked to nutrient availability in forest soil." Doctoral thesis, Mittuniversitetet, Avdelningen för naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-25994.

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As agrarian society developed, the most fertile soils able to sustain the nutritional requirements needed for high crop yield were assigned to farming, while the more penurious soils were left to uphold the forest ecosystems. Some temperate forests are developed on acidic soils considered to be nutrient poor, as much of the inorganic nutrients are entrapped in poorly weatherable soil minerals and not easily accessed by plant roots. In an undisturbed ecosystem, the largest contribution of available nutrients comes from the recycling of organically bound nutrients via the decomposition of dead p

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20

Teufel, Amber Grace. "Influence of abiotic drivers (light and nutrients) on photobiology and diversity of Antarctic lake phytoplankton communities." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1468411564.

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21

Teklay, Tesfay. "Organic inputs from agroforestry trees on farms for improving soil quality and crop productivity in Ethiopia /." Umeå : Dept. of Forest Ecology, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/2005122.pdf.

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22

"BIOCHARS AS AMENDMENTS FOR SASKATCHEWAN AGRICULTURAL SOILS." Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-05-1519.

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Biochars are the product of high temperature treatment of carbonaceous materials with little or no oxygen present, termed “pyrolysis”. Biochars derived from the pyrolysis of biomass feedstocks have proven effective amendments on highly weathered tropical soils. However less is known about their impact on temperate soils and associated crop growth. Moreover, there is inadequate knowledge of the impacts of different biochars produced from different feedstocks under differing pyrolysis conditions. Therefore, a study was conducted to evaluate the effectiveness of different biochars as amendments t

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23

Wullaert, Hans [Verfasser]. "Response of nutrient cycles of an old-growth montane forest in Ecuador to experimental low-level nutrient amendments / Hans Wullaert." 2010. http://d-nb.info/100428120X/34.

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24

Licudine, Danilo Lucero. "Organic residues as liming materials and supplementary nutrient sources for acid soils." Thesis, 1995. http://hdl.handle.net/10125/9275.

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25

Feldkirchner, Drew C. "Responses of northern harwood forests to amendments of nutrient fertilizer and paper mill biosolids." 2000. http://catalog.hathitrust.org/api/volumes/oclc/45450431.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 2000.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 27-29).

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26

Chen, Hao Huan. "The Effects of Nutrient and Peat Amendments on Oil Sands Reclamation Wetlands: A Microcosm Study." Thesis, 2011. http://hdl.handle.net/10012/5939.

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Oil sand mining operations in Alberta, Canada produce large quantities of process water and mature fine tailing (MFT) during the bitumen extraction process. Wet landscape reclamation is one of the reclamation strategies proposed to utilize process water and MFT in the creation of aquatic reclamation environments that are economically and environmentally acceptable. In the interest of utilizing nutrient enrichment and peat amendment to improve aquatic flora and fauna colonization in new oil sands aquatic reclamation, this microcosm study was designed to assess the phytoplankton and periphyt

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27

Handest, Joshua A. "Effects of nutrient amendments and genotype on stand productivity and crown characteristics in loblolly pine (Pinus taeda L.)." 2001. http://www.lib.ncsu.edu/etd/public/etd-4630172201022210/etd.pdf.

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28

Jacobson, John C. "Effect of soil pH and organic amendments on tobacco yield, maturity, nutrient concentration by leaf position and soil fertility." 1987. http://catalog.hathitrust.org/api/volumes/oclc/16521840.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1987.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 74-77).

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29

Winton, R. Scott. "The Effects of Organic Matter Amendments and Migratory Waterfowl on Greenhouse Gas and Nutrient Dynamics in Managed Coastal Plain Wetlands." Diss., 2016. http://hdl.handle.net/10161/12131.

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<p>Wetland ecosystems provide many valuable ecosystem services, including carbon (C) storage and improvement of water quality. Yet, restored and managed wetlands are not frequently evaluated for their capacity to function in order to deliver on these values. Specific restoration or management practices designed to meet one set of criteria may yield unrecognized biogeochemical costs or co-benefits. The goal of this dissertation is to improve scientific understanding of how wetland restoration practices and waterfowl habitat management affect critical wetland biogeochemical processes related to

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30

Ngo, Thi Thanh Hue. "Optimising phosphorus supply to plants by combining inorganic P fertilisers and organic amendments, and the roles of arbuscular mycorrhizas." Thesis, 2021. https://hdl.handle.net/2440/133787.

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Inorganic phosphorus (P) fertilisers are used widely to maximise crop yields. However, in many cases, much of the P fertiliser applied is unavailable to plants due to P adsorption. Consequently, excess inorganic P fertiliser application often ensues. The consumption of inorganic P fertiliser has increased over the last five decades causing increasing concern around the availability of mineral P resources, and growing interest in identifying alternative sources of P to support sustainable agricultural production. Inorganic P fertilisers, organic P-rich materials and arbuscular mycorrhizal

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31

Lin, Chia-Ying, and 林佳瑩. "Exogenous nutrient amendment coordinated bioaugmentation enhances 2,4,6-trinitrotoluene degradation mediated by cometabolism." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/05187100014865272742.

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碩士<br>國立高雄師範大學<br>生物科技系<br>103<br>Abstract 2,4,6-Trinitrotoluene (TNT), a nitroaromatic compound, widely used in military and industrial sites frequently caused soil and groundwater contamination in past decades. Bioremediation is a currently important method to remove TNT contamination. In this study, the earthworm Metaphire posthuma was acclimated in forest soil spiked with 2,4,6-trinitrotoluene (TNT), an earthworm enteric bacterium, Citrobacter youngae strain E4, was isolated to assess the capacity of microbial degradation of TNT in culture medium or in a soil slurry with/without exogenous

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32

Chiu, Wen-Hsuan, and 邱文軒. "Bioremediation enhancement with PCP-degrading bacteria and nutrients amendments in pentachlorophenol-contaminated soil." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/23506016070001724063.

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碩士<br>國立屏東科技大學<br>生物科技研究所<br>100<br>Pentachlorophenol(PCP) contaminated soil amended with compost in a 1:1 ratio are useful for PCP degradation in previous study. However, the bulky composts are not convenient for the practical application. To reduce the usage amount are the purpose of this investigation. We design two batches of bioreactors experiments to realize whether nutritional supplement or degradation microbes are the key parameter of amended compost. First, sterilized/non-sterilized compost or nitrogen are applied to PCP contaminated soil which was inoculated with PCP-degradating-bac

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33

Chen, Chi-Peng, and 陳紀芃. "Effect of Sesbania sesban Biochar Amendment on Soil Nutrients and Greenhouse Gas Emission." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/87349151888591286300.

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碩士<br>國立臺灣大學<br>森林環境暨資源學研究所<br>101<br>Studies have shown that amending biochar to soil is able to change the processes of C and N mineralization, therefore affect the emission of soil greenhouse gases; it can also improve the physical and chemical properties of soil, therefore enhance the agricultural performance. The aims of this study are to understand 1. How do charring temperature affect the chemical structure of biochar, and what are the structural differences between raw material and biochar; 2. How do these structural differences affect the emission of soil carbon dioxide, nitrous oxide

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34

Martín, López María. "Study of sewage sludge aimed at agricultural soil amendment by thermogravimetric analysis and fourier-transform infrared spectroscopy." Master's thesis, 2012. http://hdl.handle.net/10400.1/5909.

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Thermal degradation and gaseous products evolving from the pyrolysis of sewage sludge, aimed at agricultural soil amendment, were investigated using Thermogravimetric Analysis in conjunction with Fourier Transform Infrared Analysis (TG-FTIR). The materials were studied in temperatures ranging from 30 to 800 ºC. Furthermore infrared spectra of sewage sludge samples were performed as a complementary technique. In parallel the sewage sludge was spiked with ibuprofen in order to test whether the mentioned techniques are able to detect the drug. Thermal analysis showed the range of 200-400ºC

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