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.
Results
Showing 1 to 20 of 100 for “"Agricultural soils"”.
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Cadmium accumulation in agricultural soils
Cadmium (Cd) has accumulated in New Zealand (NZ) soils as a result of phosphate fertiliser application. Cadmium is a biotoxic heavy metal and can be adsorbed by soil and enter the human food chain. Three objectives were investigated in this thesis: 1. Determine if the distribution of Cd varies …
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Constitutive relationships for agricultural soils
… develop the constitutive relationships for two agricultural soils, which could be used for the finite element analysis of multipass effects of vehicles on soil compaction. Sandy-clay and sandy-silt samples were loaded and unloaded three times to levels of 138 kPa to simulate three passes of an …
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BIOCHARS AS AMENDMENTS FOR SASKATCHEWAN AGRICULTURAL SOILS
… 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. …
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Soil acidity in southern Canadian prairie chernozemic agricultural soils
… were effectively ameliorating the low pH soils. Further study investigated spatial variability of soil pH on the study fields, the most practical sampling density for accurate pH maps was shown to be 1 sample spot per 0.8 hectares. After this study, data was gathered on the incorporation …
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Sorption, degradation and transport of estrogens and estrogen sulphates in agricultural soils
… The four hormones rapidly degraded in the agricultural soils under aerobic conditions, and the majority of the compounds degraded > 50% within the first 24 hrs. Soil arylsulphatase activities were directly correlated with degradation rate constants of the estrogen sulphates. Estrone was …
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Studies of microplastics present in sewage sludge, effects on amended agricultural soils
… possible impact of MPs on the use of sludge as agricultural fertilization, the presence of MPs in agricultural soils previously treated with sludge or compost from sewage treatment plants for fertilization, and their exposure to earthworms in southern Spain was evaluated. Composts were used, …
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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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Fate of 17α-Estradiol, 17β-Estradiol, and Estrone in Agricultural Soils and Sediments
… the sorptive behavior of 17α-E2 and 17β-E2 on agricultural soils using batch sorption experiments on seven autoclave-sterilized soils, with a range of properties, where both solution and soil phase concentrations were measured; (2) the aerobic biodegradation of 17α-E2 and 17β-E2 in soils using …
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Factors Influencing Salmonella Survival in Agricultural Soils and Internalization through Solanaceous Crop Roots
… influence the survival of Salmonella in agricultural soils and (ii) determine the risk of Salmonella internalization in to transplanted solanaceous crops (tomatoes and bell peppers) and identify factors that influence internalization through the roots such as mode of contamination, soil …
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Factors Associated with Foodborne Pathogens and Fecal Indicator Organisms in Virginia Agricultural Soils
… as well as enteric bacteria, can thrive in agricultural soils. Understanding how macro- and micronutrients, as well as meteorological factors and observational factors, impact pathogen prevalence may promote a better understanding of how pathogens persist in agricultural soils. This study …
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Impact of Cover Crops on Phosphorus Biochemical Cycling and Dynamics in Texas Agricultural Soils
… (P) is a critical yet often limiting nutrient in agricultural systems. This thesis investigates how different soil management practices and preservation methods influence phosphorus dynamics, focusing on phosphatase activity and phosphorus availability in Texas soils. The research is divided into …
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Chemical Fractions And Predictions For Long-term Releases of Phosphorus In Typical Canadian Agricultural Soils
… approach to reduce P pollution is to identify soils with high P loss potential and develop management strategies to minimize that risk. This thesis contributes towards greater understanding of short- and long- term P dynamics in soils to which different P sources had been applied (Chapters 3 …
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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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Depth sequence distribution and reactivity of phosphorus in intensively managed agricultural soils in East-Central Illinois
This Thesis was approved for publication on 2019-04-08 at 15:57.
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Effects of extraction time and phosphorus speciation on soil test phosphorus (STP) in Illinois agricultural soils
The student, Anthony Miller, submitted this Thesis for approval on 2017-03-27 at 11:16.
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Organic-Input Impacts on Soil Carbon Flux, Storage, and Budget in Conservation Agricultural Soils, Central Washington, USA
… which has been depleted by land use change and agricultural practices, is a prime target for C storage. Land management practices, including no-till, cover cropping and crop rotation, and the application of C amendments such as compost and biochar, are suggested to increase C in the soil. Spoon …
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Management, microbiology, and machine learning: A systems approach to evaluating the nitrogen cycling microbiome in agricultural soils
… that catalyze them are of special interest in agricultural settings. This dissertation explores several different aspects of the N cycling soil microbiome, ranging from community-level impacts of conservation agriculture to the effects of phylogenetic diversity on bioinformatics clustering …
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Competitive sorption of phytic acid and phosphate in agricultural soils and at the amorphous aluminum oxyhydroxide-water interface
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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