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 50 for “"N fixation"”.
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Intensification of Micro-Plasma Bubble Processing for N-Fixation and its Potential Application
… micro-plasma bubble processing for nitrogen fixation and reviewed its application both on Earth and in space. The study was carried out by performing five main tasks, these being: (1) air/N2 plasma processing in batch water/recycling water with/without heterogenous catalysts; (2) air/N2 …
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N₂ fixation, plant mineral nutrition and C metabolites in cowpea/maize cropping systems
The objective of this study was (1) quantify N₂ fixation in sole and mixed cropped cowpea, (2) To access nutrient assimilation by component species in the cropping system, and (3) to determine the effects of cropping system on C metabolites. At harvest the dry mass of both cowpea and maize were …
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Symbiotic N² fixation in cyclopia vent. spp. (honeybush) : towards sustainable cultivation in the Western Cape of South Africa
An indigenous cash crop, called honeybush (Cyclopia spp., Fabaceae), has recently gained popularity in the Western Cape of South Africa and its potential for cultivation is being investigated. The crop is an N²-fixing legume and its yields would therefore be improved by enhancing its N²-fixing …
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N₂ fixation by subsurface populations of Trichodesmium : an important source of new nitrogen to the North Atlantic Ocean
… extent to which Trichodesmium dinitrogen (N2) fixation contributes to the marine N cycle has been modeled based on abundance data and rate estimates from surface populations. However, recent data show that Trichodesmium populations have a broad vertical distribution. The presence of previously …
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Assessing chemical control options and their effects on lesser clover leaf weevil, red clover pollinators and evaluating red clover seeding rates for optimal seed production and N fixation in Saskatchewan, Canada
… optimal red clover seeding rate and biological N fixation. The research presented in this thesis had two objectives. First, to evaluate the effectiveness of the insecticides deltamethrin and cyantraniliprole in controlling LCLW in red clover in both field and laboratory-based evaluations, as well …
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Free living nitrogen-fixation in ponderosa pine/Douglas-fir forests in western Montana
… forest restoration treatments on non-symbiotic N-fixation in the forest ecosystem has been poorly studied. Over the past 100 years, fire has been greatly excluded from low elevation, fire maintained forests as a result of active fire suppression as well as land management activities that create …
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Free living nitrogen-fixation in ponderosa pine/Douglas-fir forests in western Montana
… forest restoration treatments on non-symbiotic N-fixation in the forest ecosystem has been poorly studied. Over the past 100 years, fire has been greatly excluded from low elevation, fire maintained forests as a result of active fire suppression as well as land management activities that create …
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Closing the knowledge gap surrounding nitrogen cycling in Minnesota lakes
… N scenarios. Microbial processes such as N fixation and denitrification can add or remove N and understanding when and where these processes occur is essential to managing N in lakes. We demonstrated recently that lakes remove nitrogen through denitrification and loss of N2 (the final …
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Quantifying the impacts of ozone pollution on the sustainability of pasture
… Ozone impacts on nodulation and nitrogen (N)-fixation in legumes have not extensively been investigated, but could have important consequences for pasture sustainability, with predicted reductions in the root nodule biomass of clovers (Trifolium spp.) of 12% or more in UK pasture. Ozone …
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Soybean nitrogen dynamics: Nitrogen fixation, yield, and residue decomposition
… it can fix part of its N through biological N fixation. The overarching goal of this research was to investigate soybean N fixation dynamics in response to environmental factors, and plant tissue decomposition to understand better N cycling and improve Midwestern US N budget estimations.</p> …
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Identifying physiological and growth-allocation strategies among varying resource availabilities enabling Scotch broom (Cytisus scoparius (L.) Link) dominance in recently clearcut Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) forests of the western Pacific Northwest
… by site. To further understand the role of N-fixation in Scotch broom’s competitive advantage of Douglas-fir we measured differences in total N-fixation with P fertilization, irrigation, and their interactions. We planted Scotch broom seedlings (n=20) in pots using N-deficient sand as the soil …
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Mungbean [Vigna radiata (L.) Wilczek]: Protein-rich Legume for Improving Soil Fertility and Diversifying Cropping Systems
… tolerant legume crop, capable of atmospheric N₂ fixation. Mungbean is a protein and iron-rich legume and can be used as vegetable or grain for human consumption or multipurpose crop. At present, few studies have simultaneously explored the best agronomic practices for mungbean cultivation and …
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The relationship between iron and nitrogen fixation in Trichodesmium spp.
… about what levels of Fe limit Trichodesmium N fixation. I developed a diagnostic for Fe limitation using quantitative reverse transcription PCR (qRT-PCR) of the Fe stress response gene isiB, which encodes for flavodoxin a non-Fe containing substitute for ferredoxin. I determined that high isiB …
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The relationship between iron and nitrogen fixation in Trichodesmium spp.
… about what levels of Fe limit Trichodesmium N fixation. I developed a diagnostic for Fe limitation using quantitative reverse transcription PCR (qRT-PCR) of the Fe stress response gene isiB, which encodes for flavodoxin a non-Fe containing substitute for ferredoxin. I determined that high isiB …
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Alfalfa growth on acid soil as influenced by Al, Ca, pH and Mo
… N, KOH and Ca(OH)2) on alfalfa root growth and N fixation on soils that received either 0 or 6.7 Mg/ha surface applied limestone. Of the various subsurface amendments the Ca(OH)2 treatment produced the most root growth and N fixation. This study showed that both the reduction in acidity and the …
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The response of symbiotic performance, growth and yield of chickpea (Cicer arietinum L. ) genotypes to phosphorus fertilizer rates and rhizobial inoculation
… Phosphorus fertilizer application increased the fixation of N by 36.8% (P≤0.01), and similarly in soil N-uptake by difference of 59.9% compared to control in 2016. Furthermore, rhizobial inoculation increased N-fixed in 2016 and soil N-uptake in both seasons. ACC#5 had the highest N fixed at …
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Legume integration and nutrient management impacts on soil health and cropping system productivity
… legume species and residue retention on nitrogen fixation, soil health and carry-over benefits for subsequent crops, 2) distinct nutrient management strategies on soil health, crop performance and system profitability and 3) residue C input and soil N availability in regulating N fixation and …
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Tropical stony corals host diverse microbial nitrogen dynamics
… important nitrogen compounds. Nitrogen (N) fixation has been well quantified in corals in accounting for the source of their fixed N, but no complementary loss term had been directly detected. This pathway is important for understanding sources and sinks of nitrogen on reefs and how they may …
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Effects of drift macroalgae on sediment nitrogen cycling in Thalassia testudinum beds of St. Joseph Bay, FL
… was stimulated under drift macroalgae blooms. N fixation was observed during all incubations, even in sediments with porewater NH<sub>4</sub><sup>+ </sup>above 300 µM. Previous research in St. Joseph Bay during summer and fall had higher denitrification rates, and lower N fixation rates than this …
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