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 11 of 11 for “"Soil porosity"”.
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Impacts of timber harvesting on soil physical properties in wetlands
… Hurricane Hugo in the fall of 1989. High soil moisture conditions during salvage operations resulted in soil compaction and deep rutting (puddling) on primary skid trails. Two studies were established to assess the effects of trafficking on soil physical properties and hydrologic …
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Computational fluid dynamics modelling of pipeline on-bottom stability.
… regarding hydrodynamic loads on pipeline and soil resistance in isolation. In reality, the pipeline stability problem is much more complex involving hydrodynamic loadings, pipeline response, soil resistance, embedment and pipe-soil-fluid interaction. In this thesis Computational Fluid Dynamics …
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Analysis of soil compaction and furrow depth from planter row unit
… such as furrow formation, seed placement, and soil-conditioning during planting. It affects seed spacing and singulation, root growth, emergence, crop health, yield, and field traffic management. This study analyzes how the planter row unit’s operation affects soil compaction, furrow depth, and …
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Effect of soil structure on temporal and spatial dynamics of bacteria
Soil is a complex heterogeneous system comprising of highly variable and dynamic micro-habitats that have significant impacts on the growth and activity of resident microbiota. A question addressed in this research is how soil structure affects the temporal dynamics and spatial distribution of …
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Soil conditioner effects on soil erosion, soil structure and crop performance
Previous work has suggested that soil conditioners can provide environmentally beneficial aids to agriculture and soil conservation. To investigate this further, studies were carried out on soil conditioner effects on soil erosion, soil structure and crop performance. The main soil conditioner …
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Disturbance, Functional Diversity and Ecosystem Processes: Does Species Identity Matter?
… on vegetation dynamics, physicochemical soil properties, and ecosystem processes. Additionally, plant functional diversity has been suggested as the key to ecosystem processes such as productivity and nutrient dynamics. I investigated how disturbance and functional composition both singly …
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Modelling spatial variation and environmental impacts of land use change in the exploitation of land-based renewable bioenergy crops
… emissions, evapotranspiration (ET) and change in soil organic carbon (SOC) according to soil properties, hydrologic regime and previous land use. Development of the DayCent model as part of this research gave improved simulation of the impacts of tillage on soil porosity, and resultant N2O …
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Forest fires and their effect on chemical and physical properties of soils in North-eastern-Libya. Assessment of the changes in soil chemical and physical properties of soils in North-eastern-Libya.
… fires are likely to adversely affect the soil properties as well as vegetation composition, and possibly lead to soil erosion and desertification. One of the most fire affected forest regions in the world is the Mediterranean. Libya, in the Mediterranean region, has soils that are …
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ENHANCED SOIL STRUCTURING BENEATH WHITE CLOVER AND ITS IMPACT ON NUTRIENT TRANSPORT
Previous work at IGER has revealed that soil structural differentiation under white clover is phenomenally rapid and enhanced when compared with ryegrass. White clover is one of the most nutritious and widely distributed forage legumes. Its use is advocated in sustainable systems of livestock …
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Changes in soil properties and their effects on maize productivity following sesbania and pigeon pea improved fallow system in Eastern Zambia
Soil degradation is a major constraint in most sub-Saharan African countries. short fallow rotations of 1-3 years have a potential to increase maize yield without additional inorganic nitrogen fertilizers. The mechanisms responsible for improved maize yield are partially understood. therefore the …