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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 75 for “"soil water content"”.
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Effect of soil water content and oxygen diffusion rate on growth of potato sets
… of Agriculture and Applied Science. Dept. of Soil Science, 1956
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The Comparison of Pressure and Suction Apparatus for Soil Water Content-Pressure Head Determinations
Made available in DSpace on 2014-12-10T17:12:26Z (GMT). No. of bitstreams: 1 6604163.pdf: 1846533 bytes, checksum: 11008eec8de508a9d5ccee668a5963de (MD5) Previous issue date: 1965
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Influence of pH, phosphorus addition and soil water content on phosphorus pools in acid sulfate soils
Acid sulfate soils (ASS) are common in wetlands and important for crop production. However, little is known about P availability in ASS which is constrained due to high Fe content and changing redox potential. This thesis aimed to investigate the effect of P addition, pH and soil water content on P …
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Modelling the effects of mulch application rates on cowpea growth, yield and soil water content using APSIM
… objective of the study was to evaluate soil water content, crop water use efficiency (WUE), grain yield and the dry matter response of cowpea (Vigna unguiculata (L)) and validate the results using the model APSIM. Data taken from the study under optimum growth conditions was used to …
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Modeling Spatial Variability of Field-Scale Solute Transport in the Vadose Zone
Spatial heterogeneity in the soil system has a profound influence on the flow of water and chemicals in the unsaturated zone. Incorporating intrinsic soil variability and extrinsic variability into root zone leaching models will provide a better representation of pollutant distribution in natural …
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Experimental warming of subarctic biocrust: Temporal responses of soil respiration and plant community
Biological soil crust, biocrust, is a significant contributor to biogeochemical cycles through nitrogen and carbon cycling. Further, it stabilizes soil, facilitates water infiltration, and mitigates soil erosion. The global biocrust cover is believed to decrease by about 25-40% in the next 60 years …
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Water Fluxes in Soil-Pavement Systems: Integrating Trees, Soils and Infrastructure
In urban areas, trees are often planted in bare soil sidewalk openings (tree pits) which recently are being covered with permeable pavements. Pavements are known to alter soil moisture and temperature, and may have implications for tree growth, root development and depth, drought resilience, and …
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Soil-atmosphere fluxes of CO2 and CH4 in annual and perennial cropping systems in southern Sweden
… as loss of biodiversity and pollution of groundwater. Newly developed perennial grains may offer solutions to some of those problems. Their longer roots and growing seasons theoretically enable them to act as sinks of atmospheric carbon. This study set out to compare soil-atmosphere fluxes of …
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Thermal gradients and water transfer in unsaturated soil.
An investigation into the flux of soil water under the influence of a thermal gradient was conducted in closed soil systems in the laboratory. A thermal gradient was imposed across the sandy loam soil columns and measured continuously for the duration of the experiment. The movement of soil water …
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Estimating and Modeling Transpiration of a Mountain Meadow Encroached by Conifers Using Sap Flow Measurements
… goal of recovering sufficient growing season soil moisture necessary for endemic, herbaceous meadow vegetation. Therefore, conifer water use represents an important hydrologic output toward evaluating the efficacy of this active management approach. This study quantified and evaluated …
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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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Water repellency effects on liquid- and vapor-phase water exchange in soil and clay minerals
Drought conditions and wildfires can induce soil water repellency. Precipitation shifts are expected to exacerbate drought and wildfire in regions such as the southeastern United States, making it critical to understand how repellency affects water exchange processes in soil. The objectives of this …
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Effects of tillage and mulching on selected soil properties, growth and yield of sunflower (Helianthus annuus L.)
… without residue retention can degrade the soil’s physical quality, decrease soil organic carbon contents and crop yields. Although the benefits of improved tillage methods and mulching have been reported in literature, little information is available on South Africa and more so on highly …
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Plant root development and hormone signalling during drought stress
… how the plant root system will adapt to a soil drying challenge is crucial. Of particular importance is the plant response to a non-lethal drought stress, which is often encountered in the field. Elucidation of the mechanisms underlying such responses, including hormonal regulations, may …
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Zero tillage for cereal production on forage sods in Manitoba
… of zero, minimum and conventional tillage on soil water content, soil compaction and crop growth on a fine-textured soil previously sown to perennial forages was studied over a two year period. The effect of glyphosate, 2,4-D and dicamba, alone or in combination was evaluated for the control …
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Coordinated Tree Responses to Drought -Vulnerability and Sustainable Production: Hypotheses on Arid Ecosystem Adjustments to Limitations in Water Resources
… out to investigate tree responses to declining soil water content. Field experiments were conducted on naturally growing trees of Acacia tortilis and A. xanthophloea in the savanna region of Kenya and Quercus suber in the Mediterranean region of Portugal. The selected field sites were regions …
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SPATIAL VARIABILITY OF THERMAL PROPERTIES IN RECLAMATION COVER SYSTEMS
Soil cover systems are an integral part of a mine reclamation program and are increasing in area. Knowledge of temperatures and thermal properties in the cover system provide important information regarding the energy balance, thermal regime, as well as preliminary insight into soil water content. …
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Hydrodynamic characterisation of soil subsurface flows for water conservation purposes.
… focuses on the hydrodynamic characterisation of soil subsurface flows using developed new soil column experimental setup to assess the hydraulic parameters of unsaturated soil in the laboratory. The soils in the inland valley of Nigeria's Niger Delta, where agriculture uses more than one-third of …
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Defining practical limits for centre-pivot length and irrigation management on Lismore soils
… was conducted to investigate the dynamics of water infiltration into an unsaturated Lismore silt loam under centre‐pivot irrigation. This was done to quantify the relative impact of application intensity and application depth on the dynamics of the soil moisture profile and on the quantity and …
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