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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 90 for “"subsoil"”.
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An Investigation of the Subsoil Component of a Constructed Mine Soil
The objective of this study was to identify and describe soil structural patterns and rooting behavior in a reclaimed mine soil. The soil chosen for this study consists of approximately 40 cm of topsoil (A horizon) material placed over approximately 150 cm of a blend of B horizon, mixed …
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Surface Wave Analysis in Laterally Varying Media
… first tens up to hundreds meters of depth of the subsoil. The surface wave method exploits the geometric dispersion proper of surface waves: in a non-homogeneous medium every frequency is characterized by a different phase velocity, as every frequency component travels through a portion of medium …
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Uptake of Sulphur-35 by pasture plants from different depths in two Canterbury soils under field conditions : A dissertation submitted in partial fulfilment of the requirements for the Degree of Bachelor of Agricultural Science (Honours) in the University of Canterbury
… radioisotope tracers have suggested that the subsoil is an important source of plant nutrients. However, soil tests in New Zealand are usually made on samples from the top 15cm or so and no information is obtained concerning the subsoil fertility and its possible contribution to plant …
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Erosion control with vegetation in highway corridors
… biota to persistent covers depend on grading and subsoil preparation, soil amendments, mulches, and specially designed seed mix:tures for seeding at various seasons. The management of these factors, through plant succession, results in persistent vegetative covers of legumes like crownvetch …
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Soil genesis studies of upland soils formed in transported materials overlying the Virginia Piedmont using trend-surface analyses
… soils is studied. Mapping units comprised of red subsoil components and mapping units with non-red subsoil components are compared. Trend-surface analysis of the elevations at which they occur and chemical and physical data from twenty-four pedons in Appomattox County are used. The mapping units …
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An Investigation Of The Soils Within And Beneath The Middens Of Two Huron Villages
… tentatively labeled charcoal, midden matrix, subsoil, grey ash and white ash. Chemical analyses of samples taken from these layers enabled a computer cluster analysis of these materials. If the clustering routine was halted when four groups had been identified it was found that the white ash …
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A hydrogeochemical investigation of metalliferous coal pile runoff and its interaction with soil and groundwater
… of coal pile runoff, samples of uncontaminated subsoil and aquifer materials adjacent to the D-Area coal stockpile runoff containment basin at the Department of Energy's Savannah River Site were collected and subjected to leaching with the acidic, metalliferous coal pile runoff. Columns were …
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Fire, Soil, Native Species and Control of <em>Phalaris arundinacea</em> in a Wetland Recovery Project.
… <p><em>Phalaris</em> cover was correlated with subsoil consolidation; areas without <em>Phalaris</em> had consolidated subsoil while <em>Phalaris</em> at >50% cover established on loose soil. <em>Phalaris</em> cover inhibited species richness (r<sup>2</sup>=0.78). No soil characteristic …
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The development of methods and equipment for the study of the aerating capabilities of a microdispersion of air in water
… environment. Hydrocarbon contamination of the subsoil and groundwater has become a major problem facing scientists and environmentalists in the 20th century. Initial treatment of contamination sites include the removal of the contaminant from the subsurface for subsequent above ground …
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Physical and Chemical Soil Properties of Ten Virginia Department of Transportation (VDOT) Mitigation Wetlands
… to liming, although some sites demonstrated low subsoil pH, indicating the presence of sulfidic materials. Nutrient levels varied, while C:N ratios were low (<25:1), suggesting a high quality organic matter complex. Organic amendments were generally applied at a rate of 4% soil organic matter …
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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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Analysis of flow patterns and flow mechanisms in soils
… flow, especially in the topsoil. In the subsoil root density decreased and inhomogeneous infiltration from preferential flow paths into the soil matrix caused non-uniform flow. There were no textural differences between the flow domains, but smaller bulk densities in preferential flow …
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Soil Carbon Assessment: Confronting Climate Change on the Farm
… for mapping and modeling field-scale subsoil, topsoil and whole profile SOC stocks via remote and proximal sensing.
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A Study of the Effect of Potassium on the Yield, Duration of Stand and Chemical Composition of Alfalfa
… Spring was about five times higher than in the subsoil; on the other hand, available phosphorus at Culpeper was about equal in topsoil and subsoil.
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Tillage effects on soil-water-air matrix and prediction of soil bulk density from cone index data
… separate models have been developed for top and subsoil layers using remolded natural soil samples. The topsoil model predicted bulk density close to the actual data taken in recently disturbed soils. One cropping season after plowing, predicted values were about 10% higher than the actual, a …
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Assessment of Exceptional Quality Biosolids for Urban Agriculture
… PAN of EQ biosolids applied to an urban degraded subsoil via tall fescue N fertilizer equivalency, and compare field results to laboratory tests; 3) to investigate EQ biosolids and inorganic fertilizer effects on urban soil properties, vegetable yields, and potential N and phosphorus (P) loss. …
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