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Dissertations / Theses on the topic 'Soil microbials'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Corneo, Paola Elisa. "Understanding soil microbial community dynamics in vineyard soils: soil structure, climate and plant effects." Doctoral thesis, country:CH, 2013. http://hdl.handle.net/10449/23970.

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This thesis aimed at characterising the structure of the bacterial and fungal community living in vineyard soils, identifying and describing the parameters that explain the distribution of the microbial communities in this environment. Vineyards represent an economical relevant agro-ecosystem, where vines, long-lived woody-perennial plants, are normally cultivated at different altitudes. The maintenance of the soil quality is at the base of a productive agriculture and thus the investigation of its biological component, its structure and all the processes that take place into the soil a

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2

Xue, Peipei. "Soil Microbial Diversity: Relating Microbial Distributions to Soil Functions." Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/28830.

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Soil microbial biodiversity is an essential component of the natural ecosystem. Soil microbes work as decomposers contributing to soil nutrient cycling, primary production, and climate regulation. The heterogeneous edaphic properties lead to the diversity of microbial community structuring and functioning. This thesis investigates microbial community distributions and functions through vertical soil profiles, at the landscape level, and along regional transects. Vertically, soil microbial communities were depicted in soil profiles to a depth of 1 m using the concept of genosoils (soil formed a

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3

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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4

Menefee, Dorothy. "Anthropogenic influences on soil microbial properties." Thesis, Kansas State University, 2016. http://hdl.handle.net/2097/32657.

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Master of Science<br>Department of Agronomy<br>Ganga M. Hettiarachchi<br>Human activities have the potential to alter soil biochemical properties in a number of different ways. This thesis will focus on how agricultural practices (tillage and cropping system), climate change, and urban soil pollution (primarily lead and arsenic) affect soil biochemical properties. Two incubation studies were conducted to determine how human activities influence soil biochemical properties. The first study focused on how altered temperature and moisture regimes affected soil properties from four different agroe

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5

Barajas-Aceves, Martha. "Soil microbial biomass and organic matter dynamics in metal-contaminated soils." Thesis, University of Nottingham, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260604.

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6

Hoyle, Frances Carmen. "The effect of soluble organic carbon substrates, and environmental modulators on soil microbial function and diversity /." Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0050.

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7

Tanner, Shann C. "Peach tree root demography and soil microbial characteristics in peach replant soils." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1202409146/.

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8

Alvarenga, Danillo Oliveira de. "Análise genômica e funcional da cianobactéria Nostoc sp. CENA67 e caracterização da sua comunidade microbiana associada." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/64/64133/tde-02022016-150801/.

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Nostoc é um gênero cianobacteriano com distribuição ubíqua que tem importância em diversos ecossistemas. Contudo, poucos genomas estão atualmente disponíveis para esse gênero. Enquanto Nostoc spp. são as cianobactérias mais comumente relatadas em relações simbióticas com fungos, animais, plantas e outros organismos, associações com outros micro organismos não receberam atenção similar. Como consequência das fortes interações entre cianobactérias e heterótrofos, culturas não axênicas são geralmente obtidas no isolamento dessas bactérias, o que proporciona uma oportunidade interessante para o de

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9

Reeve, Jennifer Rose. "Soil quality, microbial community structure, and organic nitrogen uptake in organic and conventional farming systems." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Summer2007/j_reeve_071207.pdf.

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10

Lopes, Elizabeth Barretto de Menezes. "Diversidade metabólica em solo tratado com biossólidos." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-29042002-160938/.

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A aplicação de biossólidos em solos agrícolas e/ou florestais é uma prática aceitável, tanto como forma de disposição destes materiais, quanto de melhorar as características físicas, químicas e biológicas do solo. No entanto, pouco se sabe dos impactos decorrentes desta utilização e dos seus efeitos sobre a estrutura das comunidades microbianas dos solos e sua capacidade metabólica. Assim, o objetivo deste trabalho foi determinar alterações quanti-qualitativas na diversidade metabólica dos microrganismos do solo após a adição de biossólidos e identificar possíveis indicadores de alteração de q

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11

Åkerblom, Staffan. "Anthropogenic heavy metals in organic forest soils : distribution, microbial risk assessment and Hg mobility /." Uppsala : Department of Environmental Assessment, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200667.pdf.

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12

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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13

Edvantoro, Bagus Bina. "Bioavailability, toxicity and microbial volatilisation of arsenic in soils from cattle dip sites." Title page, Contents and Abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09A/09ae24.pdf.

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14

O'Flaherty, S. M. "Microbial diversity in contaminated soil." Thesis, Cranfield University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274042.

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15

Paulse, Arnelia N. (Arnelia Natalie). "Soil stabilization by microbial activity." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53593.

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Thesis (MSc)--Stellenbosch University, 2003.<br>ENGLISH ABSTRACT: Microorganisms play an important role in the stability and maintenance of the ecosystem and in the condition of the soil. However, in their natural environment, microorganisms often experience changing and hostile conditions. They therefore need to be able to adapt physiologically and modify their micro-environment. Biofilm formation is one mechanism to establish favorable micro-environments. The extracellular polymeric substances (EPS) that are typically associated with biofilm formation may also have an impact on soil s

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16

Ilstedt, Ulrik. "Soil degradation and rehabilitation in humid tropical forests (Sabah, Malaysia) /." Umeå : Swedish University of Agricultural Sciences, 2002. http://diss-epsilon.slu.se/archive/00000233/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2002.<br>Abstract inserted. Appendix reprints four papers and manuscripts co-authored with others. Includes bibliographical references. Also partially issued electronically via World Wide Web in PDF format; online version lacks appendix.

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17

Arthur, Mickey Francis. "Soils containing 2,3,7,8-tetrachlorodibenzo-p-dioxin : aspects of their microbial activity and the potential for their microbially-mediated decontamination /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487330761218489.

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18

Mungai, Nancy Wangari. "Distribution of soil organic carbon and nitrogen fractions, enzyme activities and microbial diversity in temperate alley cropping systems /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3137732.

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19

Ning, Qiushi. "Soil Microbial Activity under Different Management Treatments in a Temperate Grassland." Thesis, Griffith University, 2017. http://hdl.handle.net/10072/368012.

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Nitrogen (N) deposition is increasing at unprecedentedly rate due to anthropogenic activities. The N deposition is altering the microbial activity and coupled C and N cycling through changing soil pH, N and carbon (C) availability. (1) N-related functional genes (NFGs) (N fixation, nifH; N mineralization, chiA; nitrification, AOA- and AOB-amoA；denitrification，narG，nirK，nirS and nosZ) regulate the main N transformation processes. However, empirically simulated N deposition experiments have been exclusively conducted through large and infrequent N fertilization, which may have caused contrasting

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20

Fallgren, Paul Harold. "Parameter-based models estimating microbial hydrocarbon-degrading activity in a diesel-contaminated soil." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1320951271&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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21

Lanza, G. R., and Phillip R. Scheuerman. "Effect of Soil Amendments on In Situ Biodegradation in Creosote Contaminated Soils." Digital Commons @ East Tennessee State University, 1996. https://dc.etsu.edu/etsu-works/2910.

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22

Neilson, Julia Killian Worsley 1958. "Microbial respiration as an index of soil aeration in compacted and sewage sludge amended soils." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/191287.

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The use of liquid sewage sludge on agricultural soils may improve productivity, but cause compaction due to an application procedure requiring multiple passes with heavy machinery. The movement of water through the soil profiles was used as an index indicating a greater degree of compaction in soils amended with high amounts of sewage sludge vs. low amounts or inorganic fertilizer. Laboratory studies developed a method to utilize CO 2 evolution from microbial respiration as an index of soil aeration. Samples of Pima clay loam soil of varying moisture levels were amended with inorganic fertiliz

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23

Gilliam, Lucy. "Impact of anti-microbial GM plants on soil microbial populations." Thesis, University of Reading, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485401.

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The environmental risk assessment of GM plants is a fast moving area of science. Much research has focused on developing methods to evaluate potential effects on a range of organisms. Microorganisms play an essential role in many soil processes, with the rhizosphere as the prominent site of microbial activity. There is a general need for protocols to assess the effect of anthropogenic influences, the use of different crops and crop rotation an.d as well as GM plants, on the microbial community within the soil. The rhizosp~eres of three crop plants Brassica napus (Oilseed rape), Triticum aestiv

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24

Obrike, Rachel Ethemena. "Microbial ecotoxicology of phosphonates in soil." Thesis, University of Reading, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.515748.

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25

Dhillon, Hardial Singh. "Microbial biodegradation in soil and groundwater." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/33040.

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All cores supplied by the British Geological Survey were heavily polluted with wide variety of organic compounds. The total organic carbon (TOC/ppm) values increased over tenfold between 5m and 10m levels. Each core of borehole VF 1020 was characterised by soil lithology, microbial numbers and metabolic activity at l0°C and 30°C, using air as the gas phase. The metabolic activity at 10°C was approximately 40% of that found at 30°C in the two core samples examined. The fluctuation in bacterial numbers and their metabolic activity show some correlation with the type of soil present, being higher

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26

Mueller, Sabrina R. "Chromium, DNA, and Soil Microbial Communities." Cincinnati, Ohio : University of Cincinnati, 2006. http://rave.ohiolink.edu/etdc/view.cgi?acc_num=ucin1141334651.

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Thesis (Ph. D.)--University of Cincinnati, 2008.<br>Advisor: Brian K. Kinkle. Title from electronic thesis title page (viewed Apr. 23, 2009). Keywords: SEC-ICP-MS; Fungal community; bacterial community; DGGE. Includes abstract. Includes bibliographical references.

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27

Morais, Daniel Kumazawa. "Petroleum effects on soil microbial communities." Universidade Federal de Viçosa, 2015. http://www.locus.ufv.br/handle/123456789/8468.

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Submitted by Reginaldo Soares de Freitas (reginaldo.freitas@ufv.br) on 2016-09-05T12:12:19Z No. of bitstreams: 1 texto completo.pdf: 1636988 bytes, checksum: 82f0e2495b29689e04e4a8d2ad963aa3 (MD5)<br>Made available in DSpace on 2016-09-05T12:12:19Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1636988 bytes, checksum: 82f0e2495b29689e04e4a8d2ad963aa3 (MD5) Previous issue date: 2015-07-29<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>O petróleo é a principal fonte de energia no Brasil, onde o consumo de óleo continua subindo desde 2013, atingindo atualmente 2.2% do t

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28

Sutanto, Yovita. "Manure from grazing cattle effects on soil microbial communities and soil quality in northern West Virginia pastures /." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=3933.

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Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains vii, 72 p. : ill. (some col.), map. Includes abstract. Includes bibliographical references.

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29

Hart, Murray. "Effects of pesticides on the soil microbial biomass and microbial activity." Thesis, University of Nottingham, 1995. http://eprints.nottingham.ac.uk/11542/.

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This thesis describes research investigating the side-effects of pesticides on soil microbial biomass and microbial activity, with particular reference to two recently developed pesticides, a fungicide, epoxiconazole, and a herbicide, quinmerac. In a dose-responsee xperiment,a pplication of thesep esticidest o a sandy loam soil, at up to 10 and 20 times field rate, had no significant effect on soil microbial biomass C or ninhydrin-reactive N, over 84 days incubation. There was also no effect on soil respiration, except for the higher rate quinmerac-treated soil, which evolved 13% lessC02-Cthan

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30

Caleb, Oluwafemi James. "Microbial community structure as an indicator of soil health in apple orchards." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4133.

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Thesis (MSc (Microbiology))--University of Stellenbosch, 2010.<br>ENGLISH ABSTRACT: The relationship between various land management practices, soil properties and the soil microbial communities are complex and little is known about the effect of these interactions on plant productivity in agricultural systems. Although it would be advantageous to have a single organism or property that can be used as a measure of soil health, it may not be possible. Soil organisms which include both the microorganisms as well as soil fauna are subjected to the effect of their immediate environment. This

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31

Juck, David F. "Polyphasic examination of microbial communities in soils contaminated with organic pollutants." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38209.

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A polyphasic approach was used to examine the impact of contamination on soil microbial community structure. Two systems were examined using a combined biochemical and molecular biological approach. Petroleum hydrocarbon contaminated soils from two Northern Canadian sites, representing long-term contamination, were examined using Biolog GN plates and PCR-denaturing gradient gel electrophoresis (DGGE) analysis of total community 16S rDNA. Results obtained using both methods demonstrated a positive correlation between samples that was based on the geographical origin of the samples, not on conta

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32

Schnürer, Ylva. "Influence of soil properties and organic pesticides om soil microbial metabolism /." Umeå : Dept. of Forest Ecology, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/2006118.pdf.

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33

Kuan, Hsueh Ling. "Resilience of soil microbial community function in an upland grassland soil." Thesis, University of Aberdeen, 2003. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU181291.

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Soil microorganisms are critical to many processes in the environment such as decomposition and nutrient cycling; yet little is known about how functional processes performed by soil microbial communities respond to and recover from perturbation. The influences of microbial community structure, rhizosphere interactions and environmental factors on soil microbial community function were examined in a temperate upland grassland soil. Two contrasting methods were used to manipulate microbial community structure in soil microcosms. In a constructive approach, soil was g-irradiated and reinoculated

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34

Rogers, Stephen Lloyd. "The effect of phototrophic microbial inoculants on soil aggregate stability and soil fertility." Thesis, University of Kent, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305060.

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35

Contin, Marco. "ATP concentration in the soil microbial biomass." Thesis, Coventry University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270692.

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36

Travis, Emma Rachel. "Microbial ecology of soil contaminated with trinitrotoluene." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613973.

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37

Fulmaka, Aviwe. "Investigating soil microbial interactions of Portulacaria afra." Thesis, Rhodes University, 2016. http://hdl.handle.net/10962/54598.

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Portulacaria afra commonly known as Spekboom contributes significantly to carbon sequestration and has been widely planted in degraded areas of the Eastern Cape. Approximately 50% of planted cuttings do not survive although the cause of this decline is unknown. Like many indigenous plants, Spekboom forms a symbiotic relationship with mycorrhizal fungi and the interaction with rhizobacteria may enhance and improve plant growth and establishment. This study aims to investigate these relationships which will include a survey of the arbuscular mycorrhizal (AM) fungal populations associated with Sp

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38

Katseanes, Chelsea Kae. "Soil Fertility Status and Degradation of 2, 4, 6-Trinitrotoluene Contaminated Soils." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/5517.

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Current models for predicting the environmental fate of munitions constituents (MC) in soils are based mostly on chemical distribution parameters and neglect the larger considerations of other soil parameters. We are working towards a new approach based on the whole soil activity for predicting the long-term residence time and fate of MC in soils with connection to agronomic soil fertility concepts. These relationships are demonstrated by correlating experiments involving full physical and chemical characterization of eight taxonomically distinct soils, with batch reactor studies determining M

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39

Adams, Edward Stephen. "Soil bacterial and viral dynamics." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10201/.

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Viruses have been shown to be responsible for considerable bacterial mortality and nutrient cycling in aquatic systems. As yet no detailed studies have been published on the role of viruses in natural soil bacterial communities despite common knowledge that viruses exist in the soil. This thesis sought to address some key questions on the ecology of soil bacterial viruses and their hosts. Disturbance through soil desiccation, nutrient inputs, rhizosphere effects and protozoan predation pressure were investigated. The first study of lysogeny in natural soil systems was also undertaken. The work

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40

Iost, Susanne. "Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1201126765623-42870.

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Impacts of land use and climate change in tropical forests on the global carbon budget are of principal interest in the recent research, as these forests amount to about 48 % of the world’s forested area. Interest has been focused on lowland tropical forests mainly, but tropical montane forests occupy about 20 % of all tropical forests. Soils of tropical montane forests are frequently waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been fully explained

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41

Iost, Susanne. "Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude." Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A24042.

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Impacts of land use and climate change in tropical forests on the global carbon budget are of principal interest in the recent research, as these forests amount to about 48 % of the world’s forested area. Interest has been focused on lowland tropical forests mainly, but tropical montane forests occupy about 20 % of all tropical forests. Soils of tropical montane forests are frequently waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been fully explained

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42

Omidvar, Negar. "Effects of different land management practices on soil nitrogen cycling and microbial composition in riparian zone soils." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/410498.

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Riparian zones lie at the interface between aquatic and terrestrial ecosystems and usually have fertile soils, which play a crucial role in maintaining ecosystem productivity and biodiversity. Riparian zones are currently subject to vegetation loss and degradation due to human activities, intensification of agricultural practices, weed invasion, and global climate change. Therefore, there is an urgent need to revegetate and/or maintain the current vegetation of riparian zones. Soil nitrogen (N) is one of the most important growth-limiting nutrients and plays a crucial role in plant growth an

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43

Cadena, Cepeda Marleny Kloepper Joseph. "Assessing soil microbial populations and activity following the use of microbial inoculants effect on disease suppressiveness and soil health /." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Fall/Theses/CADENA_MARLENY_3.pdf.

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44

Caniquitte, Sabine Sophie. "Soil microbial community, soil aggregation and cropping system: study of their relationship." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19278.

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The effect of six cropping systems on soil carbon, aggregation and microbial community was examined after three growing seasons. The six cropping systems involved corn, sorghum, soybean, red clover, timothy and bare fallow, and differed in terms of tillage practice, type of crop (perennial versus annual) and type, amount and quality of carbon inputs to soil. Soil structure under sorghum and timothy differed from that of bare soil. Soil total carbon content exceeded that of fallow only under the two perennial cropping syste

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45

Davies, Matthew P. "Soil Improvement Using Microbial Induced Calcite Precipitation and Surfactant Induced Soil Strengthening." UNF Digital Commons, 2018. https://digitalcommons.unf.edu/etd/837.

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Microbially induced calcite precipitation (MICP) has been used for a number of years as a technique for the improvement of various geological materials. MICP has been used in a limited capacity in organic rich soils with varying degrees of success. Investigators hypothesized that microbially-induced cementation could be improved in organic soils by using a surfactant. Varying amounts of Sodium Dodecyl Sulfate (SDS) were added to soils of varying organic content and a mixing procedure was used to treat these soils via MICP. Treated specimens were tested for unconfined compressive strength (UCS)

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46

Williams, David. "Ecophysiological studies of soil ammonia oxidising bacteria." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=26464.

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47

Delmont, Tom. "Description des communautés microbiennes du sol par une approche métagénomique." Thesis, Ecully, Ecole centrale de Lyon, 2011. http://www.theses.fr/2011ECDL0048/document.

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Les données présentées dans ce manuscrit de thèse sont principalement basées sur l'analyse de séquences d'ADN extraites directement de l'environnement (et en particulier du sol) en les comparant aux données cumulées au fil des siècles sur les microorganismes cultivés en laboratoire. Les objectifs, difficultés, résultats et perspectives de cette approche, que l'on nomme « métagénomique », sont décrits. Un métagénome représente la diversité génétique d'un habitat défini (par exemple un sol du champ agricole) dans sa globalité. Ainsi, générer un métagénome a notamment pour but d’accéder à la dive

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48

Andersson, Stefan. "Influence of liming substances and temperature on microbial activity and leaching of soil organic matter in coniferous forest ecosystems /." Uppsala : Swedish Univ. of Agricultural Sciences (Sveriges lantbruksuniv.), 1999. http://epsilon.slu.se/avh/1999/91-576-5850-1.pdf.

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49

Ries, Mackenzie Lynn. "The Effect of Salinity on Soil Microbial Community Structure." Thesis, North Dakota State University, 2020. https://hdl.handle.net/10365/31807.

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Soil salinity is a widespread problem that affects crop productivity. We expect that saline soils also have altered microbial community structure, soil food webs and related soil properties. To test this, we sampled field soils across four farms in eastern North Dakota that host salinity gradients. We evaluated microbial biomass carbon, phospholipid fatty acid analysis and nematode counts in moderately saline and low saline soils. Additionally, we measured soil properties that represent potential food sources and habitat characteristics that influence microbial communities. We found higher mic

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Van, Schoor Louise. "Effect of biological amendments on soil microbial properties and performance of pome fruit trees." Thesis, Stellenbosch : Stellenbosch University, 2009. http://hdl.handle.net/10019.1/4602.

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Thesis (PhD(Agric))--Stellenbosch University, 2009.<br>ENGLISH ABSTRACT: The global movement in agriculture is towards more environmentally friendly, sustainable production practices, since the role of soil microbial functions in ensuring crop production and soil fertility has become more evident in agricultural systems. Furthermore, with the impeding phase-out of methyl bromide, apple replant disease (ARD) is becoming an increasingly important problem and biological management practises are needed. Since microbial activity is generally carbon-limited in agricultural soil, it is widely accept

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