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 20 of 113 for “"soil nutrient"”.
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Effect of soil nutrient status on stress tolerance in Proteaceae
… lepidocarpodendron grown on low, medium and high nutrient treatments exhibited the lowest, and similar evapotanspiration rates respectively over a 9 day water stress cycle (experimental period). In stressed and unstressed treatments, stomatal conductance and transpiration rates of plants grown on …
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Influence of Poultry Litter on Dark Tobacco Growth and Soil Nutrient Availability
… fertilizers increase the osmotic pressure of the soil solution and soil acidity, often causing reduced stands, Mn toxicity, Mo and Ca deficiencies, and reduced yield and quality of the cured leaf (Sims et al., 1984). Poultry litter utilized as a nutrient source is an inexpensive alternative to …
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Topsoil thickness impact on corn, soybean, and switchgrass productivity and soil nutrient management
Topsoil thickness, or depth to claypan (DTC), is a major contributing factor to variability in corn (Zea mays L.) and soybean (Glycine max [L.]) yield, profit, and nutrient dynamics on claypan soils. Understanding how and when DTC affects these factors across the landscape is crucial for improving …
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The effect of soil nutrient availability on resource allocation in tropical tree species
… strategies for resource use and acquisition. Soil resources influence productivity of tropical forests and the distributions of tree species across edaphically heterogeneous landscapes. My dissertation evaluates functional variation among tropical trees in nutrient use, and the implications of …
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Factors affecting soil nutrient availability and its impact on maize and soybean productivity
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Characterization of ion-selective electrodes for an on-field soil nutrient analysis system
… established need for more careful application of soil nutrients and fertilizer to maximize crop yield for an ever-growing population. This study focuses on the manufacturing and characterization of ion-selective electrodes (ISEs) to further study if they could be used to reliably measure soil …
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The effects of biochar and NPK fertilizer on maize performance and selected soil nutrient levels
… low and continue to decrease due to decline in soil fertility, which has been identified as a major constraint to crop production. Therefore, there is a pressing need for soil amendments such as the application of biochar, which has the potential to improve soil fertility due to its physical and …
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Identifying the requirements of an agricultural robot for sensing and adjusting soil nutrient and pH levels
The nutrient requirements of soils using in agriculture for crop production were examined to determine the needs of a robotic system used to detect and regulate the nutrition levels of the soil. Nitrogen, phosphorus, and potassium levels, along with pH, were chosen as the most important factors for …
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Phosphorus speciation, agronomic performance and soil nutrient testing for waste recovered fertiliser use in Northern Irish soil
… (NI), agronomic and environmental targets for soil P are based on measurements of sodium bicarbonate extractable-P (Olsen-P), but this methodology has been shown to underestimate bioavailable P in the iron and aluminium rich basalt soils of the Antrim Plateau, which covers a third of NI. An …
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Effects of soil nutrient availability on the development of tropical monodominance and subordinate species composition in montane forests
… achieves high abundance. The study assessed soil properties along with species composition using a paired plot design consisting of mixed forest and nearby Oreomunnea-dominated forest sampled at four sites in montane forest in western Panama. We found support for the “ecosystem modification” …
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Characterization and agronomic evaluation of biochar amendments in a midwestern loam soil: effects on soybean yield, soil nutrient retention, and leachate quality
The development and application of biochar as a soil amendment has shown promising results for improving soil fertility, enhancing nutrient retention, and mitigating environmental degradation in agroecosystems. This dissertation investigates the physicochemical properties of biochar derived from …
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Are forests restricted by nutrient poor soils? : an analysis of soil nutrient stocks and associated vegetation in the fynbos biome, South Africa
… has long puzzled ecologists, although patchy nutrient distribution and fire disturbance are thought to play a role. The issue has been confounded in the recent past by the invasion of non-indigenous woody plants into formerly low stature fynbos dominated areas. Despite low wood nutrient …
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Multi-ISFET sensor system for soil analysis
… dependent on field mapping of the variations in soil and crop parameters. The development of soil nutrient sensors may both improve the accuracy of soil nutrient maps and decrease the cost of soil sampling.
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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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Integrating the effects of climate change and caribou herbivory on vegetation community structure in low Arctic tundra
… its effects on permafrost degradation and nutrient cycling, and to cause positive feedbacks to global climate change through its impacts on carbon balance and albedo. Experimental evidence indicates that tundra plant growth is most strongly limited by soil nutrient availability, which is …
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Effects of nutrient limitation on understory communities in a tropical forest
… peak in mid-elevation tropical forests. Soil nutrient limitation is an important factor influencing plant communities and yet little is known about the factors influencing fern floristic composition and functional traits in montane tropical forests. My dissertation compares composition …
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Residual Nutrient Removal by a Winter Cover Crop From Broiler Litter Amended Soils
… concerns. One primary concerns is the possible nutrient build-up in pasture and cropland as a result of broiler litter application. Studies were conducted at Western Kentucky University using sorghum sudangrass (Sorghum bicolor (L.) Moench) as a forage to possibly remove excess nutrients. This …
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