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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 128 for “"soil texture"”.
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Soil texture determination by an acoustic cone penetrometer method
Soil texture is an important soil property, contributing to many aspects of soil performance, ranging from productivity to ease of tillage. Currently, textural analysis is either estimated in the field with limited accuracy, or analyzed in a laboratory setting through a time consuming and labor …
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An approach to map soil texture class on the Iowan Erosion Surface
The objective of this digital soil mapping (DSM) research was to compare approaches of new and legacy dataset combination to produce surface soil texture class maps on the Iowan Erosion Surface physiographic region (MLRA 104) using standard and novel predictor variables (covariates) for modeling. …
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Effects of soil texture, soil depth, and treatment on septic tank effluent renovation
This study compared the effects of soil texture, soil depth, and additional treatment, by constructed wetland (CW) and recirculating sand filter (RSF) systems, on wastewater renovation in a texture group 2 (loam) and a texture group 3 (clay loam) soil. The soils with depths of 15, 30, and 45 cm …
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Effect of Temperature, Moisture, and Soil Texture on Dimethyl 2,3,5,6 Tetrachloroterephthalic Acid Degradation (Crabgrass)
The effect of soil temperature (ST), soil moisture (SM) and soil texture (STX) on DCPA (Dimethyl 2,3,5,6 tetrachloroterephthalic Acid) degradation was measured in the laboratory. Treatments consisted of six soil temperatures with a combination of three soil moisture levels. Soil temperature …
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Thirty-year Changes in Mineral Soil C in a Cumberland Plateau Forest as Influenced by Inorganic-N, Soil Texture, and Topography
… this study was to (i) compare changes in mineral soil C after a 30-year interval and (ii) examine the role of inorganic-N, soil texture, and topography in these changes. Soil samples were collected at permanently identified points on the Camp Branch Watershed, a second growth oak forest on the …
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Green-Ampt infiltration model parameter determination using SCS curve number (CN) and soil texture class, and application to the SCS runoff model
The U.S. Department of Agriculture (USDA) Soil Conservation Service Curve Number (SCS CN) method is a simple and widely popular technique of estimation of direct runoff volume for design and natural rainfall events in small watersheds. The SCS CN procedure is incorporated into such computer …
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Underlining the potential drivers of carbon allocation in Kernza® crops
… and belowground biomass and the role of soil properties, this work integrates field measurements, soil texture analyses, and spatial data to address knowledge gaps in carbon partitioning within perennial grain crops. Results indicate that Kernza roots extend more deeply in sandy soils and …
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A model to define hydrologic response units based on characteristics of the soil-vegetative complex within a drainage basin
… hydrologic response units and were a funtion of soil texture, soil depth, land use, and hydrology group classification. A computer model was developed to generate excess precipitation for each hydrologic response unit based on the Mein and Larson and Holtan infiltration equations. Data for …
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Determining Water Requirements in Turfgrass Systems
… affected by cultivar, irrigation frequency, and soil texture; 3) and determine the reference evapotranspiration (ETo) percent replacement that maximizes bermudagrass (Cynodon dactylon [L.] Pers.) establishment from seed and whether Turfgrass Water Conservation Alliance qualified cultivars require …
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The Distribution of ORCUTTIA CALIFORNICA (Poaceae) in the Vernal Pools of the Santa Rosa Plateau, Riverside County, California
… related to concurrent biweekly measurements of soil moisture, soil texture and microrelief of each plot, area and order of desiccation of each pool. Frequency and density show no correlation to soil moisture, soil texture, and area. There is, however, a positive correlation between occurrence of …
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An Experimental Assessment of Soil-Based Habitat Partitioning in Understory Palms
Soil nutrient and water availability can shape plant communities by influencing species composition and the functional traits that allow species to regenerate, grow and reproduce. My dissertation research established patterns of understory palm community assembly and functional traits in relation …
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Effects of Water Table Depth and Edaphic Characteristics on Plant Diversity in a Southern Mississippi Pitcher Plant Bog
… examined the effects that water table depth and soil characteristics have on plant species richness and species composition within pitcher plant bogs across seasons. Eight piezometers were installed at random distances to monitor long-term water table depth and pressure fluctuations along a …
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Trace Metal Concentrations across Trophic Levels in Cotton Fields of Xinjiang Province, China
… become concentrated in urban and peri-urban soils with the use of agricultural practices and industrial emissions. Fertilizers, liming, sewage sludge, and irrigation water contain metals which accumulate in agricultural fields and pose a risk to humans and wildlife. Coal plants and brickyards …
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Classification of soil surface texture using high-resolution RGB images captured under uncontrolled field conditions
Understanding the properties of soil and its impact on the environment and farming practices requires accurately classifying its texture. Accurate soil texture classification can optimize soil nutrient levels and improve land management. This study proposes a framework that uses images captured …
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On-site effects of accelerated erosion on direct-physical soil quality indicators
Accelerated soil erosion is a serious agricultural problem in South Africa limiting soil productivity and little it’s known about its effect on soil quality. This study aimed to provide a less laborious, less time consuming and inexpensive protocol of estimating the effects of accelerated erosion …
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Depth Profiles and Soil Textures of the Vernal Pools of the Santa Rosa Plateau Preserve, Riverside County, California
… Rosa Plateau Preserve, thus documenting the role soil texture plays in vernal pool formation.</p> <p>Several field and laboratory procedures were used to demonstrate that there is a higher percentage of clay present within vernal pools than in soils outside the margin of the pools, for 11 out of …
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Use of geographic information systems for assessing ground water pollution potential by pesticides in central Thailand
… Thailand. Factors used for this purpose were soil texture, percent slope, primary land use, well depth, and monthly variance of rainfall. These factors were reclassified to a common scale showing potential to cause groundwater contamination by pesticides. This scale ranged from 5 to 1 which …
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Small mammal and herpetofauna communities and habitat associations in foothills of the Chihuahuan Desert
… characters. Post-facto analysis utilizing soil texture suggests that higher relative abundance of common herpetofauna species occurs on sandy substrata compared to stony substrata. For herpetofauna, soil texture may be a more important habitat factor than vegetation. Seeds, an important …
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Development of Urban Tree Growth Models Based on Site and Soil Characteristics
… was therefore to characterize a broad suite of soil characteristics associated with urban tree plantings and evaluate their suitability for modeling physical dimensions and growth rates of urban trees. A series of observational studies and experiments was conducted on urban soils inhabited by …
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