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 49 for “"soil sampling"”.
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Developing aggregative soil sampling methods to improve preharvest produce safety
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Value of soil sampling and optimal sampling density for a variable rate seed application
Grid soil sampling has become one of the most popular and powerful methods to investigate soil characteristics in various crop input application experiments. Based on the recommendations of previous literature, farmers and researchers believe that a single sample per hectare is the optimal sampling …
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Validation of N-STaR Nitrogen Rate Recommendations and Evaluation of N-STaR Soil Sampling Procedures for Clay Soils in Arkansas
… are the standard N recommendation (SR) based on soil texture, previous crop, and rice cultivar, and the Nitrogen-Soil Test for Rice (N-STaR) which quantifies the potentially mineralizable-N of the soil and provides a site-specific N recommendation. The N-STaR program has recently been developed, …
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Multi-ISFET sensor system for soil analysis
… dependent on field mapping of the variations in soil and crop parameters. The development of soil nutrient sensors may both improve the accuracy of soil nutrient maps and decrease the cost of soil sampling.
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Investigation of how oral bioaccessibility of potentially toxic elements in urban soils is affected by contaminant source and sampling techniques
Potentially Toxic Elements (PTEs) in urban soils often originate from both geogenic and anthropogenic sources. Understanding their mobility, distribution, and geochemical interactions provides the necessary evidence to effectively assess the risks posed to people from exposure to soil …
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Use of 15N2 for direct measurement of free-living N2 fixation
… and a lack of standardization regarding soil sampling, storage, and incubation. Such methodological constraints, including the presence of nitrogenous contaminants, a lack of atmospheric uniformity, and incomplete description of procedural details, are eliminated with a technique …
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Using crop simulation to optimize variable rate experimentation
… was 9.8 $/ha. (2) The added value of gathering soil sampling data at the same time was 7.4 $/ha. (3) The optimal time to stop running trials and start using the information for N-management advice was one or two years, depending on the weather. (4) Conducting trials and using that information …
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EXAMINATION OF VOLATILE ORGANIC COMPOUNDS ASSOCIATED WITH HUMAN DECOMPOSITION BYPRODUCTS IN SOIL
… techniques for locating remains. For this study, soil samples were taken from an approximate center of mass from 32 known cadaveric decomposition islands (CDIs) at the Forensic Research Outdoor Station (FROST) in Marquette, MI, and analyzed using gas chromatography-mass spectrometry (GC-MS) …
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Automated soybean cyst nematode extraction unit
… nematode management plan which utilize extensive soil sampling to assess SCN population density. Even though the nematode management practices exist, they require greater spatial and temporal resolution in SCN field counts. Currently, SCN extraction from soil samples is time consuming and highly …
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Eisenia hortensis Detects Chemesthetic Irritants through TRP Channels
… their movement, they assist in aerating the soil as well as increasing soil permeability to water which can increase plant growth. Despite their importance to agriculture, little is known about earthworm chemesthesis i.e., the detection of chemical irritants. Based on a ecotoxicology soil …
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Finite element analyses of pile load tests performed in the Yorktown formation, Newport News, Virginia
… required for finite element analyses, including: soil sampling and in-situ tests within the Yorktown formation; standard soil laboratory tests for index properties and strength-deformation characteristics of the soil along the pile perimeter and tip, plus interface tests to evaluate soil …
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Soil phosphatase activity: sources of variability and relationships with phosphorus fractions
Soil phosphorus (P) is hypothesized to exist in pools varying in availability given that its availability is controlled by interacting soil geochemical and biological processes. Soil P pools have been widely characterized by sequentially extracting P from soils with increasing strength of …
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Application of a discrete element model to the analysis of granular soil recovery in an offshore tubular vibrocore
… to grow and become ever more relevant. Seabed soil sampling is crucial in deep-water engineering projects or geological studies where a detailed knowledge of the seabed geology is required. Deep-sea vibrocoring is a relatively new offshore sampling technique. The system consists of a vertical, …
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The impact of harvesting and site preparation on nutrient dynamics, soil erosion and stream water quality in the Virginia Piedmont
… and 4) shear, rake-pile, disc. A combination of soil solution, streamwater and soil sampling and a series of soil incubations, both laboratory and <i>in situ</i> monitored changes in the treatment areas following site preparation. Available nitrogen reserves decreased substantially in the shear, …
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Geophysical, geochemical and arable crop responses to archaeological sites in the Upper Clyde Valley, Scotland
… analysis of the plants and the archaeological soils in which they had grown, in an attempt to link any changes in elemental compositions with the growth responses, and to the geophysical responses recorded at the soil sampling points or for the features from which the soils were taken. The …
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Evaluating Agricultural Best Management Practices to Mitigate Neonicotinoid Transport in Water and Soil
… the sampler, along with leachate and soil sampling techniques, in a two-year field study testing the effects of winter cover crops and different edge-of-field buffer strip plant types on movement of the neonicotinoid thiamethoxam (TMX) and its metabolite clothianidin (CLO) in treated …
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Keanekaragaman dan kepadatan cacing tanah pada agroforestri berbasis kopi di Desa Puncu Kecamatan Puncu Kabupaten Kediri
… sampel pada setiap lokasi dilakukan menggunakan soil sampling ukuran 25x25x30 dengan 30 sampel. Penelitian menunjukkan bahwa pada kedua lokasi ditemukan 3 genus cacing tanah yaitu: Pheretima, Pontocolex dan Lumbricus. Keanekaragaman yang paling tinggi terdapat pada lokasi I dengan Indeks …
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Biodegradation of methanol and tertiary butyl alcohol in previously uncontaminated subsurface systems
… the potential for biodegradation in subsurface soils and groundwater from sites in Williamsport, PA, Wayland, NY, and Dumfries, VA. These subsurface systems were characterized both physically, chemically and biologically. Bacterial populations were substantial in all systems and ranged from 10³ …
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Acid deposition effects on soil chemistry and forest growth on the Monongahela National Forest
… impact forest ecosystems. AD may acidify soils through base cation leaching or Al mobilization, may cause accumulation of nitrates and sulfates in soils, and in some cases has been related to forest decline. The Monongahela National Forest (MNF) lies downwind from many sources of AD …
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SOIL SALINITY AND SODICITY OF GALVESTON AND PELICAN ISLANDS, TEXAS
… of the island with seawater, causing elevated soil salinity levels that killed much of the vegetation on the island, including tens of thousands of trees. Residual salinity in soils and groundwater has hampered vegetation re-establishment in some areas.</p> <p>This project aims to create a map …
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