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 8 of 8 for “"chemical indicators"”.
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Spatial variability of soil biological and chemical indicators in selected soils in South Africa
… spatial variability of selected soil fertility indicators could make it possible to optimize the use of agricultural inputs with the reduction of economic and environmental risks. The aim of this study was to determine the degree of spatial variability of soil fertility indicators in selected …
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Effects of UV Irradiation on the Reduction of Bacterial Pathogens and Chemical Indicators of Milk
… as UV dose increased (p < 0.05). The chemical analyses supported the findings from the olfactory studies. The outcome of this research showed that UV irradiation at the wavelength 254 nm, was detrimental to certain chemical properties of fluid milk. The properties that were perceived …
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Geochemical signals of volcanic unrest at the Virkisjökull Glacier Iceland
… in south east Iceland as a case study, a geochemical approach is taken to this problem by utilising stable isotopes of water and sulphate alongside major chemistry and the noble gases. Analysis of oxygen deuterium data collected over four years revealed a hydrological system dominated by …
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Modeling effective isotopic fractionation in groundwater aquifers with heterogeneous reaction rates
… process in contaminated aquifers. The chemical indicators provided by certain isotope ratio shifts help to resolve complications from the physical and chemical heterogeneities unique to each site. For a number of redox-active contaminants (e.g., chromate, nitrate, selenate, etc.) …
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Nematode Community Structure and Indicators of Biologically-Based Fertility: Influence of Management During Transition to Certified Organic Production
… investigated the influence of management on indicators of soil quality and nematode community structure in systems transitioning from conventional to organic production. The goal was to improve soil assessment and ultimately performance of organic production systems. Soil samples were …
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Acid deposition effects on soil chemistry and forest growth on the Monongahela National Forest
… the relationship between growth and key indicators of soil acidity. Furthermore, we used those relationships to create a map of site resistance to acidification across the MNF. To further develop a monitoring scheme we assessed two soil sampling protocols and two soil analysis methods for …
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Developing Critical Loads and Dynamic Critical Loads for Acidification for Watersheds in the Adirondack region of New York and Great Smoky Mountain National Park (GRSM)
… and ammonium deposition. In this study, a biogeochemical model (PnET-BGC) was applied to 20 watersheds in the Adirondack region and 12 watersheds in Great Smoky Mountain National Park (GRSM) to calculate CLs and DCLs. I evaluated ecosystem changes in response to historical and potential future …