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 80 for “"nutrient concentration"”.
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Effectiveness of 2016 Watershed Protection Plan on Bacteria and Nutrient Concentration Loads in the Attoyac Bayou Watershed
<p>In 2004, bacteria and nutrient sampling on the Attoyac Bayou Watershed discovered elevated concentrations of <em>E. coli</em> on five of the main channels key tributary streams. The Attoyac Bayou was then listed on the <em>Texas 303d</em> list of impaired waterbodies and further research was …
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Development and analysis of the measured annual nutrient loads from agricultural environments (manage) drainage nutrient concentration database
… to understand the mechanisms responsible for nutrient transport from this land use leading to the eutrophication of surface waters and the hypoxic zone in the Gulf of Mexico. It is also vital to understand the effects of management practices in drained systems, as subsurface drains are …
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Comparison of Nutrient Concentration in Four Fertility Treatments After Poultry Litter Application to Orchardgrass and Sorghum-Sundangrass Hayfield Soils
… indicating that it is currently not determining nutrient availability among treatments in orchardgrass and sorghum-sudangrass soils. Nitrate concentrations exhibited increases in treatments N and P for orchardgrass soils, while sorghum-sudangrass soils indicated all three treatments N, I, and P …
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Chickpea nitrogen fixation, rhizosphere nutrient concentration and contribution of residual nitrogen to improve maize production in response to biochar application in three different soil types
… biochar (ACB) to improve rhizospheric soil nutrient availability, bacteria abundance and diversity, chickpea growth and total nitrogen fixation in three contrasting soil types. Thirdly, another pot experiment was conducted to determine the contribution of residual N from biochar and N-fixed …
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Predicting Maize Yield, Nutrient Concentration and Uptake in P and K Fertilized Soils: Pressurized Hot Water and Other Alternatives to Mehlich I Extraction in Guatemala Soils
… levels. To determine whether PHW-extracted nutrients could be used to predict maize yield, as nutrient content and uptake, soil, plant tissue and grain samples were obtained from a multiple-site field study and calibration studies were conducted using five rates of P and three rates of K on …
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Water Quality Modeling of Freshwater Diversions in the Barataria Basin
… and high flow on the water level, salinity and nutrient concentration of the Barataria Basin over a 2 period is presented here. The model predicts that the salinity of Lower Barataria decreases with the introduction of freshwater diversions. The model also predicts that nutrient concentration …
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EFFECT OF MYCORRHIZAE INOCULATION ON THE GROWTH AND SUCCESS OF THREE TAXODIUM DISTICHUM HYBRIDS IN SALINE - IMPACTED COASTAL SOILS
… diameter at breast height (DBH), and tree leaf nutrient concentration over the 2021 growing season. The effect of these treatments on soil health was determined by measuring the soil microbial functional diversity and soil respiration. </p> <p>None of the three treatments had a significant …
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Characterisation of nitrogen stress response genes of the marine Alga Gracilaria Gracilis
Low environmental nutrient concentration is the main factor limiting natural production and success of Gracilaria gracilis cultivation in Saldanha Bay, South Africa and nitrogen is the single element of all the nutrients required by seaweeds that is most frequently limiting to growth. Biomass, …
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Marama bean (Tylosema esculentum), a non-nodulating high protein legume indigenous to the Kalahari sands : studies of its N nutrition
… a non-nodulating perennial legume native to the nutrient-poor soils of the Kalahari Sands. In Botswana and Namibia, it is the staple food of the Khoisan people. Marama bean, however, still have not been cultivated or established as an agricultural crop in these countries. This study investigated …
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Comparative analysis of nitrate load estimation techniques in watersheds with different land-use characteristics
Water quality issues stemming from high nutrient concentration in water bodies are a commonplace in the United States (US) and all over the world. Nutrient loads in surface water can be estimated by monitoring their concentrations in the water bodies. The challenge is to determine the optimal data …
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The role of water column and benthic communities in the spatial and temporal production and uptake of nutrients in controlling the trophic status of the Knysna River Estuary, South Africa
… original data, which includes the measuring of concentrations of ammonium, nitrates (nitrate and nitrite), dissolved inorganic phosphate and urea in the water column quarterly for one year at 21 stations. It estimates the contribution to these nutrients from rivers, storm drains and rainfall …
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A turbulent diatom vs dinoflagellate phytoplankton biomass model
… the interaction between turbulence and available nutrient concentration. This study introduced a simple variable accounting for the effects of turbulence to a numerical model describing diatom and dinoflagellate growth in order to emulate the common successional pattern. Succession was …
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Nutrient composition of human milk and dietary influence during the first six months of lactation
… week of pregnancy to the sixth month postpartum. Nutrient content of milk samples was similar to values reported in the literature. Calcium and zinc concentrations of human milk decreased significantly during the five month study. Moisture, energy, total lipids, protein, and magnesium levels …
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Biogeochemical niche construction in the forest-fynbos mosaic of Jonkershoek Nature Reserve, South Africa
… winter. Soil properties, mainly texture and nutrient concentration differed distinctly between forest and fynbos. I argue that these differences are caused by topographical diversity and maintained by vegetation which influences nutrient enrichment via dust accumulation and plant litter …
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Method development for the characterization of intrinsic and extant kinetic parameters in microalgal cultures
… environmental conditions (light intensity, nutrient concentration, etc.). As we seek to develop such models, we must also have reliable approaches to calibrate and validate key parameters that govern model accuracy. The objectives of this research are to develop an experimental apparatus and …
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Defining nutrient co-location typologies for human-derived supply and crop demands to advance resource recovery
… inputs. Proximity between human-derived nutrient supply and crop nutrient demands influence how nutrients are recovered in order to be a competitive alternative to synthetic fertilizers. For 107 countries, we analyze the co-location of human-derived nutrients and crop demands for …
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Oxygen Mass-Transfer in Tower Fermenters
… experiments. The effects of gas flow-rate, nutrient concentration, antifoams and microbial concentration on mass—transfer have been studied in detail: superficial air velocity and the presence of anti-foams are shown to be the most important factors. Measurements with the oxygen electrode …
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Economic Feasibility of Sub-surfaced Poultry Litter
… soil surface, while costly, allows for greater nutrient retention than broadcasting. Since quantifying costs and benefits of sub-surface litter application (SSLA) is complex, we develop and present a spreadsheet tool for automated comparison between SSLA, fertilizer, and broadcasted litter for …
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Mathematical Modeling of Vascular Tumor Growth and Development
… is primarily based of Fickian diffusion of nutrients into the tumor. While the angiogenesis sub-model is based on the diffusion and chemotaxis of active sprout tips into the tumor. These two portions of the models allow the effects of microvessels on nutrient concentration within the tumor, …
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The ecophysiological significance of insectivory as well as nitrogen and phosphorus availability to sundew nutrient cycling, growth, and success
The impact of nutrient addition on growth and nutrient accumulation in insectivorous plants was studied in field populations and greenhouse plantings. Drosera rotundifolia was studied in the field, and D. binata var. multifida and D. capensis were studied in long-established plantings in the …
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