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Showing 1 to 18 of 18 for “"subsoils"”.
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Engineering Properties of Champaign-Urbana Subsoils
Made available in DSpace on 2015-05-12T17:06:25Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6003962.PDF: 12915258 bytes, checksum: 05b6d9082aff82234e846d33fe3d0b9d (MD5) Previous issue date: 1960
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The determination of the accumulation and penetration of exchangeable potassium found in Dunmore silt loam under long-time rotational practices
… exchangeable potassium found in the surface and subsoils of a 33-year rotation experiment at Blacksburg, Virginia, was made. The rotation is located on Dunmore silt loam, Which is rated as a relatively fertile soil in Virginia. There are indications that sheet erosion has removed considerable …
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The creation of novel methodologies to examine the effects of phosphorus amendments on petroleum hydrocarbon bioremediation
… aimed to improve P recovery from calcareous subsoils. After investigating pretreatments to a sodium hydroxide - ethylenediaminetetraacetic acid (EDTA) extraction, sodium acetate recovered the largest concentration of P from Po-doped calcareous subsoils (5.6% Pt) compared to other tested …
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Investigation of a clay lined storage pit
… the degree of contamination of the natural subsoils around the pit. The field investigation findings show a more complex geometry for the pit than that suggested in the design documents. While shown on the plans, the presence of the bottom clay liner is questionable. Large depressions and …
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Acidity of certain Virginia soils as related to their mineralogy and chemistry
… of Al from the clay and its accumulation in the subsoils. The chemical data show that exchangeable Al is the predominant source of acidity. The mineralogy of these soils is quite similar. The predominant clay minerals present are kaolinite and vermiculite. From the acidity standpoint, the surface …
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Erosion control with vegetation in highway corridors
… favorable microenvironment for plant growth with subsoils. Stands and vegetative covers were similar, although weed growth on topsoil materials was more severe than on subsoils. Roughened topsoil or subsoil surfaces sharply enhanced growth and vegetative cover as compared to the smooth topsoil or …
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Causes of temporal variations in N species transformations and mobility under acid grassland in York: The multi-functional role of plant litter
… extractable NH4+ concentrations in underlying subsoils. When litter was incorporated within subsoils, it greatly reduced NO3- concentrations in the drainage water, especially in winter when NO3- is many fold more mobile due to lower biological uptake. Extractable NH4+ concentrations correlated …
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Coevolutionary dynamics under anthropogenic impact in intensively managed landscapes
… is 1 to 2 orders of magnitude higher than subsoils. The vertical profiles of the subsoils follows the pattern of SOC profiles. The HCL rate--defined as the ratio of HCL to total SOC in topsoils is mainly dominated by microbes, but the ones in subsoils is dominated by soil moisture. In the …
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Monitoring Hydrology in Created Wetland Systems with Clayey Soils
… of saturation in created wetlands with high-clay subsoils at the Cedar Run 3 mitigation bank site in Prince William County, Virginia. Three complete replications of an electronic central array and an associated surrounding array of manually monitored wells and piezometers were installed. The …
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Trees and Structural Soil as a Stormwater Management System in Urban Settings
… whether tree roots can grow into compacted subsoils and if root penetration increases soil infiltration rate. Quercus velutina, Acer rubrum, and a no-tree variant were planted in 26.5 L (7 gal) containers and the rootballs surrounded by compacted clay loam. Roots grew into all layers of the …
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Long-Term Effects of Rock Type, Weathering and Amendments on Southwest Virginia Mine Soils
… lost C, but mobilized significant C into their subsoils. In the SA, an apparent C retention maximum of 30-35 Mg ha⁻¹ was noted. Overall, rock type and amendment effects were still evident after 26 years and the long-term benefits of organic amendments were reflected in sustained higher C, …
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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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Geoarchaeology of the Danilo Bitinj and Pokrovnik Sites, Dalmatia, Croatia
… calendar years. Both Danilo Bitinj and Pokrovnik subsoils contain quartz and potassium feldspar, revealing a non-karst, possibly volcanic origin. The valley-and-range topography of the central Dalmatian polje-karst field coupled with this fertile, fine-grained fill most likely served to enhance …
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Analysis of Reconstructed Mine Soils on Reclaimed Coal and Mineral Sands Mined Lands in Virginia
… influences and rowcrop productivity. Coal mine subsoils densified as root-limiting layers formed that were not observed initially and all soils had weak pedogenic development (^Bw; cambic horizons), particularly SS derived soils. Initial rock spoil type strongly influenced coal mine soils over …
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Soils and soil clay mineral formation in the Virginia Blue Ridge and Piedmont provinces
… and by dense plastic, poorly drained, clayey subsoils. In all other soils and in the surface horizon of these soils, the major clay minerals are kaolin and vermiculite. Topography affects the degree of profile development, color, and soil texture and controls the rate of clay mineral …
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REACTIVE TRANSPORT OF IRON AND HYDROCHAR COLLOIDS IN A HYDROCARBON-CONTAMINATED SUBSURFACE ENVIRONMENT
… fractures. To bioremediate the groundwater and subsoils at a former gas bar in Stony Plain, AB, Canada, amendment solutions containing ferric ammonium citrate and nutrients were injected into the anoxic groundwater. Colloids in the groundwater (solid particles retained on a 0.45 μm filter) and …
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The nitrogen nutrition of maize on dryland soils of the central Orange Free State
… by the nitrogen available in the respective subsoils (1-2 and 2-3ft.). 3. Differences in the nitrogen status between localities were evidently caused by appreciable differences in the mineral nitrogen cor;tents of the soils. The ability of the respective soils to liberate mineral nitrogen did …
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Fate and Bioavailability of Per- and Poly-Fluorinated Substances (PFASs) in Soils
… PFOA was weak in all soils, but even more so in subsoils, indicating that PFOA could easily be leached through surface- and sub-soil horizons into ground-waters. The retention of PFOS and PFHxS was not affected by soil depth. The sorption of all three PFAAs was influenced by their structural …