Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"agricultural soil"”.
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Stress-density relationships for an agricultural soil
… effect of a tractor wheel loading on the soil. A volume measuring technique was developed to be used in triaxial tests conducted under high loading rates. A sandy clay agricultural soil was tested under predetermined conditions using an INSTRON loading frame, a differential pressure …
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No-tillage squash production on agricultural soil and minesoil
… establishment into a killed surface mulch on agricultural soil increased marketable acorn squash (Curcurbita pepo L. 'Table Ace’) yield by 29% as compared to a conventional tillage practice. These yield differences are attributed to increased plant population and possible improved water …
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Nitrous Oxide Production in Agricultural Soil – Linking Biogeochemical Pathways and Drivers
… drivers from the largest anthropogenic source: agricultural soil. Therefore, we investigated agricultural soil from long-term trial field sites in the laboratory and used 15N-enriched tracers in two main approaches: partitioning of the sources of N2O production and quantification of the gross …
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Systems analysis, design, and testing for an agricultural soil compaction sensing device
… Organization (FAO) estimate that global agricultural food production will need to increase 56% between 2010 and 2050 to meet projected caloric demands of the growing population. Given the finite amount of global land area as well as the impacts agricultural land-use and production have on …
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The Transfer and Fate of Cadmium and Zinc from Sewage Sludge Amended Agricultural Soil in an Arthropod Food Chain
… of the transfer and fate of trace metals in soil-plant-arthropod systems in an agricultural context has received little attention, despite the potential threat that secondary toxicity to predatory arthropodsposes to the biological control of crop pests.In this study, an agricultural soil was …
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The Plant Growth-Promoting Potential of Root-Associated Bacteria from Plants Growing in Stressed Environments
… growing in both a chronically nutrient-deficient agricultural soil and a hydrocarbon-contaminated soil for plant growth-promoting potential in vitro and ii) assess the plant growth-promoting capabilities of isolates in vivo. Bacterial isolates belonging to genera common to both environments were …
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Soil phosphatases: factors affecting enzyme activity in Arctic tussock tundra and Virginia mineral soils
… was examined in disturbed and undisturbed Arctic soils with variable moisture content and in Virginia forest, grassland and agricultural soils. Distribution of acid and alkaline phosphatases was related to soil pH. The pH optimum for enzyme activity was near 5.5 in all soils except agricultural …
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Isolation and Partial Characterization of a Pseudomonas Species That Degrades 3,6-Dichloro-2-Methoxybenzoic Acid (Analog Enrichment)
… as a growth substrate could be isolated from an agricultural soil. Secondly, an assessment was made of the role of plasmid DNA in Dicamba degradation.
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Role of airborne soil particulate in transfer of Salmonella spp. to tomato blossoms and consequential fruit contamination
… known. Salmonellae have been known to survive in agricultural soil. Since dispersal of soil particulate by wind is a common phenomenon, the potential of airborne soil particulate as a vehicle of Salmonella contamination in tomato blossoms was examined. It was determined that Salmonella enterica …
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Trace elements in agricultural soils of Saanich Peninsula, Vancouver Island, British Columbia, Canada
… of trace elements in 30 Saanich Peninsula agricultural soil samples were determined by acid digestion and inductively coupled plasma - optical emission spectroscopy (ICP-OES). A comparison of the results obtained to a 1995 BC Ministry of Environment data indicated that As, Cu, Mo, Sb, Se …
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The effect of oily waste and nutrient amendments on soil fertility and oat growth
… were conducted with a sandy, marginal agricultural soil from the Brown soil zone near Richmound, Saskatchewan. The objective of the study was to determine how oily waste from heavy oil upgrader affects soil fertility, plant growth and microbial activity under controlled environmental …
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Terracing, Land Management and Agricultural Soils in the Andagua Valley of the Southern Peruvian Andes
… and climatic changes can drastically alter agricultural land management practices, affecting the availability of agriculturally relevant nutrients in the soil. This project investigates the use, reconstruction and abandonment of agricultural terraces and the implications these conditions …
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Natural transformation and growth inhibition of azotobacter vinelandii in the presence of adsorbed oxytetracycline
… genes and antimicrobials are introduced to agricultural soil through land application of manure. Both can persist in the environment if adsorbed to soil grains, allowing potential for increased antimicrobial resistance in the soil microbial community. Oxytetracycline (OTC) is a commonly used …
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Agronomic Suitability Studies in the Russian Altai Using Remote Sensing and GIS
… Starting-point approaches are: 1) the Agricultural Soil Suitability Model „Almagra” and Land Capability Model “Cervatana”/MicroLEIS System (De la Rosa et. al 1992, 1998) developed for Mediterranean regions and a method specifically compiled by Burlakova L. M. (1988) for the Altai based …
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The effect of chaotropic magnesium chloride on the growth of microbes
… and NaCl, using samples from a salt marsh and agricultural soil (Colchester, UK). Viable counts decreased for both solutes as concentrations increased but MgCl₂ had no viable counts at a concentration of 1.5 M and above. PCR amplification showed that salt marsh fungi dominated in MgCl₂ …
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Nondestructive investigation of soil moisture level using optical system
Soils are one of the essential resources consisting of unconsolidated mineral or organic material on the surface of the Earth; it plays an important role in the growth of land plants. Soil testing is an effort to assess the soil constituents and moisture level; this information is useful to …
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Effects of Organic and Conventional Agricultural Practices on Soil Microbial Communities and Molecular Detection of Soil Borne Disease
<p>Agricultural practices affect soil microbial communities and health through the input of pesticides, herbicides, fertilizers, and cycling of crop rotation. By examining the microbial community structure, we analyzed how microbial species respond to the environment that individual farms create. …
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A Novel Mass Spectrometer for Atmospheric Measurements & Halocarbons During the CARIBIC and SAMBBA Aircraft Campaigns
… source of CHCl3 were identified and wetlands or agricultural soil disturbance were hypothesised as a likely cause.
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