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Dissertations / Theses on the topic 'Soils Australia Nitrogen content'

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Published: 4 June 2021

Last updated: 4 February 2022

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1

Lotfollahi, Mohammad. "The effect of subsoil mineral nitrogen on grain protein concentration of wheat." Title page, table of contents and summary only, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phl882.pdf.

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Copy of author's previously published work inserted. Bibliography: leaves 147-189. This project examines the uptake of mineral N from the subsoil after anthesis and its effect on grain protein concentration (GPC) of wheat. The overall objective is to examine the importance of subsoil mineral N and to investigate the ability of wheat to take up N from the subsoil late in the season under different conditions of N supply and soil water availability. Greenhouse experiments investigate the importance of subsoil mineral N availability on GPC of wheat and the factors that contribute to the effective

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2

Hoyle, Frances Carmen. "The effect of soluble organic carbon substrates, and environmental modulators on soil microbial function and diversity." University of Western Australia. School of Earth and Geographical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0050.

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[Truncated abstract] The principal aim of this thesis was to examine the response of the microbial community to the addition of small amounts (<50 μg C g-1 soil) of organic C substrates (‘trigger molecules’) to soil. This addition is comparative to indigenous soluble C concentrations for a range of soil types in Western Australia (typically measured between 20 and 55 μg C g-1 soil). Previously it has been reported that the application of trigger molecules to European soils has caused more CO2-C to be evolved (up to six fold) than was applied . . . Findings from this study indicated that there

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3

Lalor, Briony Maree. "An assessment of the recovery of the microbial community in jarrah forest soils after bauxite mining and prescription burning." University of Western Australia. School of Earth and Geographical Sciences, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0037.

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[Truncated abstract] Recovery of soil nutrients, microbial populations and carbon (C) and nitrogen (N) cycling processes are critical to the success of rehabilitation following major ecosystem disturbance. Bauxite mining represents a major ecosystem disturbance to the jarrah (Eucalyptus marginata) forest in the south-west of Western Australia. Mining has created a mosaic of mined areas in various stages of succession surrounded by non-mined forest areas. Initial site preparations within rehabilitation areas such as contour ripping alter soil structure (creation of mound and furrows) and over t

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4

Baethgen, Walter E. "Plant nitrogen availability in selected Virginia soils." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/90907.

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Surface and subsoil samples were collected from agriculturally important soils of Coastal Plain, Piedmont and Ridge and Valley regions of Virginia for the purpose of determining the contribution of different soil N fractions to plant available N. Soil samples were analyzed for exchangeable and non-exchangeable NH₄⁺-N, NO₃⁻-N, total N, and organic matter contents. The samples were also subjected to the anaerobic incubation procedure as an index of organic N availability. Plant available N was measured by N uptake of successive wheat crops grown in the greenhouse. Multiple linear regression mode

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5

Mehdi, Bano B. "Soil nitrate-N and plant nitrogen distributions under different tillage practices." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/MQ44220.pdf.

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6

Sarmah, Ajit K. "Persistence and mobility of triasulfuron, metsulfuronmethyl, and chlorsulfuron in alkaline soils." Title page, abstract and contents only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phs2461.pdf.

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Bibliography: leaves 157-174. This study examined the fate of three common sulfonylurea herbicides in highly alkaline soils through a series of laboratory and field experiments to determine if existing leaching models could be used to describe their field behaviour under Australian climatic conditions. A liquid chromatographic method was developed to simultaneously determine levels of triasulfuron, metsulfuronmethyl, and chlorsulfuron in soil and water. The investigation of base hydrolysis for the herbicides in aqueous buffer and soil solutions determined that it was unlikely to be a major los

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7

Fotovat, Amir. "Chemistry of indigenous Zn and Cu in the soil-water system : alkaline sodic and acidic soils." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phf761.pdf.

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Copies of author's previously published articles inserted. Bibliography: leaves 195-230. In this study the soil aqueous phase chemistry of Zn and Cu in alkaline sodic soils are investigated. The chemistry of trace metal ions at indigenous concentrations in alkaline sodic soils are reported. Metal ions at low concentrations are measured by the graphite furnace atomic absorption spectrometry (GFAAS) technique.

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8

Haskin, Catherine Marie. "Nitrogen availability and soil microclimate after clearcutting lodgepole pine." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24677.

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Long term management of lodgepole pine depends, in part, on the nutrient capital of the site. Harvesting has been shown to increase the availability of nitrogen and other nutrients for a limited period of time. This increase, or nutrient flush, following cutting has been attributed to several factors including changes in organic matter quantity and quality, soil moisture and temperature regimes, and competition for nutrients. Knowledge of the duration and the magnitude of the nutrient flush would be valuable for management decisions. A consequence of lodgepole pine clearcuts was studied for s

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9

Simon, John J. "Wastewater application to soils: hydraulic and nitrogen considerations." Diss., Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/71186.

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Land application of domestic and industrial wastewaters provides an effective means of recycling water and its components into the ecosystem. Successful treatment by soil requires that wastewater is applied in quantities that both maintain infiltrative capacity of the soil and do not exceed the capacity of the soil-plant system to assimilate biological and chemical contaminants. Application of N-rich wastewaters requires that consideration be given to both the ability of the soil to transmit the hydraulic load and remove sufficient N to maintain groundwater quality standards. A textile wastewa

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10

Melkamu, Teshome. "Intercropping in corn : soil physical quality and soil inorganic nitrogen levels." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ44098.pdf.

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11

Glessner, Michael. "Effects of Long-Term Nitrogen Additions on Rapid Nitrate Immobilization in Forest Soils." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/GlessnerM2005.pdf.

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12

Liang, Baochang. "Soil organic carbon and soil nitrogen fractions in a Quebec soil as influenced by corn plant population, hybrid, irrigation and fertilization." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=55697.

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13

Meier, Jackie N. "Effects of lignosulfonate in combination with urea on soil carbon and nitrogen dynamics." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56658.

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Lignosulfonate (LS), a by-product of the pulp and paper industry, may have the potential to increase fertilizer N availability by acting as a urease and nitrification inhibitor. Four consecutive laboratory studies were conducted to evaluate the behavior of LS in agricultural soils. The effects of various types and rates of LS on soil respiration and soil N dynamics were determined. Effects of LS in combination with fertilizers on microbial activity and N dynamics were measured. Due to the high water solubility of LS a leaching column study was conducted to determine the potential leaching of L

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14

Au, William R. "Relationships between microbial physiological status and nitrogen availability in forest soils." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21506.

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Although the physiological nitrogen demand of the soil microbial biomass is a major determinant of N mineralization in forest soils, the exact nature of the relationship is unclear. This study investigated the relationships between a respiration-based indicator of microbial physiological N demand (NIR) and N availability in forest soils. NIR was found to correlate significantly with net mineralized N in the field and annual foliar litterfall N fluxes. In a laboratory incubation, NIR was shown to be sensitive to changes in soil available C and N pools. These results demonstrated that microbial

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15

Shrestha, Hari Ram. "Post-fire recovery of carbon and nitrogen in sub-alpine soils of South-eastern Australia /." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/6963.

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The forests of south-eastern Australia, having evolved in one of the most fire-prone environments in the world, are characterized by many adaptations to recovery following burning. Thus forest ecosystems are characterized by rapid regenerative capacity, from either seed or re-sprouting, and mechanisms to recover nutrients volatilized, including an abundance of N2 fixing plants in natural assemblages. Soil physical, chemical and biological properties are directly altered during fire due to heating and oxidation of soil organic matter, and after fire due to changes in heat, light and moisture in

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16

Schoenholtz, Stephen H. "Restoration of nitrogen and carbon cycling in an Appalachian mine spoil." Diss., Virginia Tech, 1990. http://hdl.handle.net/10919/28437.

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Nitrogen deficiencies have long been acknowledged as a factor limiting the restoration of ecosystems destroyed by surface mining in the Appalachian Region of the U.S. The fundamental ecological structure and function common to intact terrestrial ecosystems are largely lacking in mine soils. Reliable guidelines for effective long-term restoration require a detailed understanding of the ecological processes occurring within the mine-soil system. The objective of this study was to determine the extent to which inorganic N fertilization, native topsoil replacement, or whole-tree wood-chip amendmen

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17

Schindler, Frank Vincent. "Redistribution and fate of applied ??N-enriched urea under irrigated continuous corn production." Thesis, North Dakota State University, 1996. https://hdl.handle.net/10365/28973.

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Understanding the redistribution and fate of N is essential for justification of Best Management Practices (BMP). This project was conducted on a Hecla fine sandy loam (sandy, mixed, Aquic Haploboroll) soil at the BMP field site near Oakes, North Dakota. One objective of this investigation was to evaluate the residence times of N03- -N in 20 undisturbed lysimeters and its infiltration time through the soil profile to tile drains. Corn (Zea mays L.) was fertilized with 135 kg N ha -1 as ??N-enriched urea plus 13.5 and 48.1 kg N ha -1 preplant for 1993 and 1994, respectively. Urea-N was band app

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18

Heidari, Sharif Abad Hossein. "Variation in the sensitivity of nodulation and nitrogen fixation to nitrate in annual "Medicago" species." Title page, table of contents and abstract only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phh465.pdf.

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Bibliography: leaves 153-179. Annual species of Medicago, or medics, are important pasture legumes in the neutral to alkaline soils of southern Australia but their nodulation and nitrogen fixation processes are retarded by soil nitrate. This study ascertains whether an observed tolerance to nitrate among medic species can be substantiated, and attempts to understand the underlying factors responsible.

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19

Serem, Vincent Kipyego Arap. "Effects of tillage and corn residues on nitrate-nitrogen and water movement through soil." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29130.

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Laboratory soil columns, 0.3 m diameter $ times$ 0.7 m long, and two computer simulation models, LEACHM-N and NTRM, were used to investigate nitrate-nitrogen ($ rm NO sb{3 sp{-}}$-N) leaching in a sandy loam soil. The following treatments were studied: no-till (NT), reduced tillage (RT), and conventional tillage (CT) practices, with residue (R) and without residue (NR). Nitrogen fertilizer was applied at a rate of 180 kg/ha in granular form (experiment I), and in solution form a year later (experiment II). In both experiments, water was applied 5 times over 3 to 4 weeks duration, with each app

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20

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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21

Kothawala, Dolly N. "Controls on the soil solution partitioning of dissolved organic carbon and nitrogen in the mineral horizons of forested soils." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115565.

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Note:<br>The soil-solution partitioning of dissolved organic carbon (DOC) withinmineral soil horizons is primarily controlled by processes of adsorption and desorption. These abiotic processes largely occur within a short equilibration time of seconds to minutes, which generally occur faster than microbial processes. To characterise the adsorption of DOC to mineral soils, I used the Langmuir adsorption isotherm, which holds several advantages to the commonly used linear initial mass (IM) isotherm. One advantage to using the Langmuir isotherm is anestimation of the maximum DOC adsorption capaci

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22

Kothawala, Dolly N. 1972. "Controls on the soil solution partitioning of dissolved organic carbon and nitrogen in the mineral horizons of forested soils." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115858.

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The soil-solution partitioning of dissolved organic carbon (DOC) within mineral soil horizons is primarily controlled by processes of adsorption and desorption. These abiotic processes largely occur within a short equilibration time of seconds to minutes, which generally occur faster than microbial processes. To characterise the adsorption of DOC to mineral soils, I used the Langmuir adsorption isotherm, which holds several advantages to the commonly used linear initial mass (IM) isotherm. One advantage to using the Langmuir isotherm is an estimation of the maximum DOC adsorption capacity (Qma

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23

Blantern, Paul Jonathan. "Factors affecting nitrogen transformations in grazed grassland soils with specific reference to the effects of artificial land drainage and N-fertilization." Thesis, University of Exeter, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280663.

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24

Mallory, Ellen B. "Crop/Livestock Integration Effects on Soil Quality, Crop Production, and Soil Nitrogen Dynamics." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/MalloryEB2007.pdf.

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25

Isse, Abdullahi. "Capacity of cover crops to capture excess fertilizer and maintain soil efficiency." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0021/MQ37132.pdf.

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26

Maqubela, Mfundo Phakama. "Bioconditioning and nitrogen fertility effects of selected cyanobacteria strains on two degraded soils in the Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2009. http://hdl.handle.net/10353/558.

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Some cyanobacteria strains have biofertilization and bioconditioning effects in soils. The objective of this study was to identify cyanobacteria with potential to improve the N fertility and structural stability of degraded soils and evaluate their effectiveness in soils of the Eastern Cape, South Africa. Isolation and characterization of the indigenous cyanobacteria strains with desirable properties was first to be undertaken because their effects are known to differ from strain to strain. Cyanobacteria strains 3g, 3v, and 7e were identified from 97 strains isolated from selected soils. Nosto

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27

Abdullatif, Farid Abbas. "Interaction of Dwell, a nitrification inhibitor, with nitrogen source, soil properties and plant growth." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184420.

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A greenhouse experiment was conducted to study the effectiveness of Dwell, a nitrification inhibitor, on the efficiency of two fertilizers applied to three Arizona soils, Anthony sandy loam, Laveen loam, and Vinton loamy sand. Tomato plants Lycopersicum esculentum cultivar Row Pak were used as an index plant. These plants were grown in soil columns of 10 cm internal diameter and 50 cm in length, containing 4,500 g of soil. Two fertilizers, urea and ammonium sulfate (AS), were applied at two rates: 112 and 224 kg N/ha. The nitrification inhibitor Dwell was applied also at two rates: 0 and 1.27

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28

Dockeray, Craig. "Drainage and nitrogen dynamics in an agricultural field." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0007/MQ44159.pdf.

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29

Atmodjo, Slamet. "Effect of different nitrogen sources, fertilizar rates, and application times on corn (Zea mays L.) yields and residual soil nitrate." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69575.

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Nitrogen fertilizer use suffers from low efficiencies and increased residual NO$ sb3$ in the soil. The purpose of this study was to compare N fertilizer efficiency by a comparison of three N sources, three rates of N fertilization, and three application times of N fertilizer. Grain corn yields increased with increases in N rates, and split applications of N were superior to preplant incorporated (PPI) fertilizer. Grain N uptake was associated to grain yield and N uptake. Stover yields increased with increased N and varied with application times of N, but the effects were not as pronounced as w

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30

Brown, Susann Melissa. "Nitrogen mineralization in boreal forest stands of northwestern Quebec." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0022/MQ29664.pdf.

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31

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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32

Zhou, Xiaomin 1962. "Agronomic and physiological aspects of nitrogen and water management for monocrop corn and corn competing with a ryegrass intercrop." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34491.

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Concern about NO$ sb3 sp-$-N leaching and groundwater pollution from monoculture corn (Zea mays L.) has prompted investigation of alternative production systems which reduce N leaching. Both intercrop systems and water table controls alone have been shown to increase nitrogen (N) uptake and reduce soil NO$ sb3 sp-$-N accumulation in cropping systems. There is a need to maintain crop productivity while reducing the potential for soil NO$ sb3 sp-$-N leaching into groundwater. However, there has been no information available regarding agronomic and physiological aspects of N and water management

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33

Liang, Baochang. "A study of corn production and nitrogen cycling in the soil-plant system." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39426.

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Increased N fertilizer efficiency in crop production is essential for agronomic, economic, and environmental improvement. In order to increase efficiency, a basic knowledge of fertilizer-soil-crop relationships and components is required. Nitrogen components in the soil-corn system were determined on two soils (Chicot sandy clay loam, Grey Brown Luvisol; Ste. Rosalie clay, Humic Gleysol). Fall soil NO$ sb3 sp-$-N levels increased linearly with increasing N rates above the 170 kg ha$ sp{-1}$ N rate. Changes in soil NO$ sb3 sp-$-N over winter were a function of both fall soil NO$ sb3 sp-$-N leve

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34

Sartor, Laércio Ricardo. "Eficiência de utilização de nitrogênio, fósforo e potássio por plantas de papuã submetidas a diferentes intensidades de pastejo e níveis de nitrogênio." Universidade Tecnológica Federal do Paraná, 2009. http://repositorio.utfpr.edu.br/jspui/handle/1/255.

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CAPES<br>A adubação nitrogenada é freqüentemente observada como um eficiente fator nutricional fornecido a planta visando melhorar a produção de espécies forrageiras, necessitando ser entendido o comportamento do nitrogênio (N) no sistema. O experimento foi conduzido na área do Instituto Agronômico do Paraná (IAPAR) na estação experimental de Pato Branco, com objetivo de avaliar a dinâmica do N no sistema solo-planta em pastagem de Brachiaria plantaginea. O delineamento experimental foi o de blocos ao acaso com duas repetições. Os tratamentos foram arranjados em parcelas subdivididas. Nas parc

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35

Bagheri, Kazemabad Abdolreza. "Boron tolerance in grain legumes with particular reference to the genetics of boron tolerance in peas." Title page, summary and contents only, 1994. http://web4.library.adelaide.edu.au/theses/09PH/09phb144.pdf.

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36

Al-Traboulsi, Manal. "Response of plant roots and pastureland soils to increasing CO2 concentration." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21500.

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In an attempt to investigate the cause of change in the competitive ability between monocots and dicots in a pastureland in Farnham, Quebec under CO2 enrichment, I chose to study the response of Plantago major (dicot) and Poa pratensis (monocot) grown in ambient and elevated CO2 chambers, hypothesizing that a large increase in root biomass of dicots would be observed under elevated CO 2. A transient stimulation of root biomass of Plantago major was found during the first month of CO2 exposure but disappeared later.<br>The second objective of this study was to examine the effect of 5 years of C

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37

Duncan, Carla S. "Carbon and nitrogen dynamics on a forest site receiving continual papermill sludge applications : a soil column study /." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-10102009-020250/.

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Crawford, Michael Cameron. "Quantification of the belowground inputs of organic carbon by the annual pasture legume barrel medic (Medicago truncatula Gaertn.)." Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phc8988.pdf.

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Bibliography: leaves 164-193. This study aims to quantify the belowground input of organic carbon by barrel medic using techniques that account for root death and decomposition as well as root secretion and exudation. It also investigates the effect of defoliation on carbon allocation within the plant so as to determine the potential for optimising carbon input to the soil through grazing management.

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Delin, Sofia. "Site-specific nitrogen fertilization demand in relation to plant available soil nitrogen and water : potential for prediction based on soil characteristics /." Skara : Department of Soil Sciences, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200506.pdf.

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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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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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42

Chantachume, Yodsaporn. "Genetic studies on the tolerance of wheat to high concentrations of boron." Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phc459.pdf.

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Bibliography: leaves 213-245. Genetic control of tolerance to boron was investigated between a moderately tolerant variety, Halberd, a tolerant line G61450 and the moderately sensitive varieties Schomburgk and Condor.

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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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Huang, Chunyuan. "Mechanisms of Mn efficiency in barley." 1996, 1996. http://web4.library.adelaide.edu.au/theses/09PH/09phh8739.pdf.

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Bibliography: leaves 131-153. This thesis investigates the mechanisms of manganese (Mn) efficiency (genetic tolerance to Mn-deficient soils) in barley (Hordeum vulgare L.) at both physiological and molecular levels.

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Eriksen-Hamel, Nikita S. "The contribution of earthworm communities to nitrogen cycling in agroecosystems of Québec /." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102976.

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Earthworms have an important role in the decomposition of organic matter, mineralization of nutrients and physical mixing of soils. Despite a large number of laboratory and greenhouse-level studies investigating how earthworms modify soil properties and promote soil fertility, we lack reliable methods to scale-up and quantify earthworm contributions to nutrient cycling at the agroecosystem level. The objective of this thesis is to determine the influence of earthworm communities on nitrogen (N) transformations in soils and to quantify their contribution to nitrogen flux through soils for soybe

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46

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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Burgess, Magdalena S. E. "Crop residue decomposition and nitrogen dynamics in corn under three tillage systems." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36879.

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Decomposition and N dynamics of grain-corn residues were investigated in a field study in southwestern Quebec, with particular reference to the roles of different plant parts (stems, leaves etc.) in determining overall residue mass loss and N content. A litterbag study was conducted, with surface and buried placements in plots under three tillage systems (no-till, reduced tillage, and conventional tillage, established five years before litterbag placement). Residue mass loss and N content were monitored over a two-year period. Separate data were obtained for leaves, stems, husks, and cobs. Net

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Miransari, Mahabadi Mohammad Reza. "Development of a nitrogen soil test for fertilizer requirements for corn and wheat production in Quebec." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23415.

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One must consider the effects of both soil N and fertilizer N, if rates of N-fertilizer application are to be optimized and NO$ sb3 sp-$ leaching into groundwater be controlled. Objectives were (1) to determine soil $ rm NO sb3 sp-$-N and NH$ sb4 sp+$-N, soil total N, and N fertilizer levels and corn and wheat yields; and, (2) to determine soil sampling times and depths for N analyses that correlated with yields and fertilizer N response. Soil samples taken at seeding and postseeding were analyzed for NH$ sb4 sp+$-N and NO$ sb3 sp-$-N, and for total N in 29 wheat sites and 44 corn sites fertil

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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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Acharya, Umesh. "Can We Increase Crop Yield Adopting Tile Drainage in Fargo Clay Soil?" Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/28849.

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Subsurface drainage has recently become common for agriculturally productive soils and key to maintain and improve crop production in poorly drained, frigid clay soils. The first study was conducted for four years (2014-17) at Casselton, ND to determine best combination of drainage, tillage and crop rotation for higher corn yield. Our finding suggested corn yield was highest with no drainage, CS and CH combination in years with drought conditions. The second study was conducted for three years (2015-17) to evaluate subsurface drainage spacing (9, 12, and 15m) and depth (0.9 and 1.2m) combinati

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