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 282 for “"phosphorus (P)"”.
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Thou shall not flow: assessing magnitudes and processes of dissolved reactive phosphorus (P) removal by P-sorbing materials
Agricultural phosphorus (P) losses continue to contribute to eutrophication globally. There are currently best management practices that target particulate P losses but are not specifically designed to reduce dissolved reactive phosphorus (DRP) losses. A novel practice is the use of P removal …
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Effect of Liquid Manure on Corn and Soybean Growth, Nitrogen Uptake, and Yields
… provide sufficient quantities of nitrogen (N), phosphorus (P), and potassium (K) for corn, has resulted in uneven growth and reduced grain yields. Field studies were conducted at Pearl City, Illinois, in 1983 and 1984 to evaluate the effects of manure rate, nitrification inhibitors, methods of …
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Modelling material mass balances over wastewater treatment plants
… a COD (electron), carbon (C), nitrogen (N), phosphorus (P), alkilinity (proton), calcium (Ca), magnesium (Mg) and inorganic suspended solids (ISS) concentrations mass balances models for unit operations in municipal WWTPs. The development of such a model, for both steady state and dynamic …
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The effect of depth of placement of phosphorus fertiliser on the growth and development of field peas / by Mohammadali H. Derafshi.
… the effects of depth of placement and level of phosphorus (P) on the growth of field peas (Pisum sativum L. cv. Alma). The results of all the experiments suggest that placing P fertiliser 4-5 cm below the seed of field pea crops will be beneficial in terms of nodulation, P uptake, grain yield …
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The influence of N, P, K, lime and other factors affecting the growth of container-grown freesia : A thesis submitted in partial fulfilment of the requirements for the degree of Master of Horticultural Science in the University of Canterbury [Lincoln College]
… on the following: 1. The effect of nitrogen (N), phosphorus (P) potassium (K) and lime (Ca - as dolomite and agricultural lime) on the growth and flowering of tetraploid freesias. 2. The effect of magnesium (Mg) on growth. 3. The influence of density and shade on freesia development. 4. The effect …
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Aspalathus and Podalyria legumes balance acquisition of phosphorus and nitrogen for growth in nutrient poor fynbos soils
… enabling tolerance of low availability of phosphorus (P) are yet to be reported in Cape legume species such as Aspalathus linearis and Podalyria calyptrata; species that demonstrated traits typical of plants from nutrient poor soils. In the three research chapters of the thesis, it was …
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Sources of nitrogen and phosphorus in stormwater drainage from established residential areas and options for improved management
… to quantify major sources of nitrogen (N) and phosphorus (P) entering urban residential catchments on two of the major dunal systems. The export of N and P from these catchments in stormwater discharge was measured, allowing investigation of some of the key pathways through which N and P enter …
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Evaluation of batch test for measurement of active biomass in activated sludge mixed liquor
… removal of carbon (C), nitrogen (N) and phosphorus (P). This implementation has been aided by the development of a suite of steady state design models (e.g. WRC, 1984; Wentzel et aI., 1990; Maurer and Gujer, 1994) and kinetic simulation models (e.g. Dold et al., 1980, 1991; Van Haandel et …
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The influence of denitrification in clarifiers on biological phosphorus removal at CCSD plant
… from this study showed that denitrification and phosphorus (P) release were occurring within the CCSD clarifiers. Dissolved oxygen (DO) and soluble COD concentrations were found to be the most influencing parameters on denitrification and P-release within the clarifiers. The results also showed …
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Biological excess phosphorus removal in activated sludge systems
… South Africa that accomplish biological excess phosphorus (P) removal, the UCT and modified Bardenpho systems. To predict the P removal in these systems, an empirical model had been developed. In the empirical model, P removal was formulated in terms of some of the system parameters, such as …
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Phytic Acid In Developing And Mature Seed Of Soybean (glycine Max (l.) Merr.) And Glycine Soja Sieb. & Zucc. (phosphorus, Zinc, Nutrition)
… for variation in the concentration of the seed phosphorus (P) storage compound, phytic acid. Seed of the soybean lines contained from 13.9 to 23.0 mg g('-1) phytic acid, while seed of the G. soja lines contained from 18.8 to 27.7 mg g('-1) phytic acid. Most of the variation in seed P was due to …
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Response of a sand-plain lowland fynbos ecosystem to nutrient additions
… factorial fertilizer addition of nitrogen (N), phosphorus (P) and a mixture of all essential nutrients excluding N and P (M) on various components of the soils and vegetation of a sand-plain lowland fynbos ecosystem at Pella, south-western Cape Province, South Africawere studied, namely: 1) Soil …
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Evaluation of the Impacts of De-Icing Salts on the Performance of Bioretention Media in Retaining Phosphorus From Urban Stormwater
… system that can remove pollutants such as phosphorus (P) from urban stormwater. P retention in bioretention systems is complicated in cold climate regions due to factors such as inputs of road de-icing salts. This study evaluates the impact of prolonged and periodic salt inputs on P …
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Impact of Surface Application of Flue Gas Desulfurization Gypusum on Infiltration, Phophorus Behavior, and Total Sulfur in a Previously Manured Coastal Plain Soil
… containing excessive amounts of plant-available phosphorus (P). Using a constant head double-ring infiltrometer, a field experiment indicated a slight increase in final infiltration rate (FIR) at 10 and 15 Mg ha-1 application rates, however a laboratory rainfall simulation showed no significant …
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Physiological and nutritional changes in nitrogen fixing trees associated with autumnal senescence and chilling
… resorbed proportionally more net phosphorus (P) than nitrogen (N) from leaves prior to autumnal leaf abscission than the non-fixing species, sycamore and leguminous honey locust. Site had little effect on the net change in foliar N or P. Root bark seemed to be an important storage …
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Sedimentary Characteristics and Nutrient Sequestration of Embanked Floodplains Along the Lower Mississippi River, Mississippi and Louisiana
… Nutrients, particularly nitrogen (N) and phosphorus (P) are the main causes of eutrophication and the Mississippi River is the main source for nutrients in the Gulf of Mexico. The lower Mississippi River is frequently subjected to flooding during high discharge and floodwater sediments and …
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Algal growth potential and nutrient limitation in the Las Vegas Bay, Lake Mead, Nevada
… the maximum specific growth rates is limited by phosphorus (P). Both the growth rates and the biomass content indicated the LV Bay is P-limited. Bioassay results, using higher nitrogen (N) and phosphorus levels, showed that increasing the N and P of the Bay concentrations to levels higher than …
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Assessing interactions between nutrients and aquatic toxicity : influences of nitrogen and phosphorus on ionic silver toxicity to the aquatic macrophyte Lemna gibba.
… to understand the effects of nitrogen (N) and phosphorus (P) concentrations and N : P ratios on the toxicity of ionic silver toxicity to the model aquatic macrophyte Lemna gibba over 7-d study periods. The experimental results indicated that L. gibba were more sensitive to silver (e.g., lower …
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Prochlorococcus genetic transformation and genomics of nitrogen metabolism
… major plant nutrients such as nitrogen (N) and phosphorus (P) are at nanomolar concentrations. Nitrogen availability controls primary productivity in many of these regions. The cellular mechanisms that Prochlorococcus uses to acquire and metabolize nitrogen are thus central to its ecology. One …
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Structure of relict arctic plant communities along the north shore of Lake Superior
… had their highest foliar nitrogen (N) and phosphorus (P) concentrations in the communities where they were most dominant. These correlations suggest that with a warmer and drier climate, the plants will experience increased moisture stress, especially in smaller cracks. This increased …
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