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 92 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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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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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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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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Assessment of co-occurrence of cyanotoxins, toxic metals and anionic surfactants in irrigation water, agricultural soils and food crops
… The co-occurrence of multiple stressors in agricultural waters and soils potentially pose a human and animal risk if contaminated water and plants are ingested. The study investigated the co-existence of cyanotoxins, anionic surfactants and metal species in irrigation water, agricultural …
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Impact of Oxygen and Pesticides on Microbial Cellulose Degradation in Aerated Agricultural Soils: A Microscaled Analysis of Processes and Prokaryotic Populations
… accumulation of potential toxic pesticides in agricultural ecosystems might influence microbial activity. It is not resolved how active cellulolytic and saccharolytic taxa respond to rapid changes in the availabilities of O2. Furthermore, it is unclear if pesticides impact on the degradation of …
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Seasonal soil carbon fluxes in transitioning agricultural soils in Central Washington State: Relations to land-use, environmental factors and soil carbon-nitrogen characteristics
Changing agricultural land-use practices to increase soil carbon sequestration contributes to climate change mitigation and improved food security by moving CO<sub>2</sub> from the atmosphere into soil as soil organic carbon (SOC). In 2016, a farm in Thorp, Washington, Spoon Full Farm, began …
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Phosphorus sensitivity in species of Proteaceae (Protea obtusifolia, Leucadendron coniferum and Leucadendron salignum) from different soil habitats : possible candidates for growth on former agricultural soils high in P
… (Protea obtusifolia, Leucadedndron meridianum) soils in the Cape Floristic Region (CFR) were compared. These species were also investigated as potential candidates for growth on nutrient enriched, post-agricultural soils. In parallel, two crop plant species (Lupinus albus, with cluster roots; …
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