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 34 for “"Nutrient Retention"”.
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NUTRIENT RETENTION BY RIPARIAN FORESTED BUFFERS IN WESTERN MARYLAND: DO THEY WORK AND ARE THEY WORTH IT?
… a BMP, many have also reported a wide range of nutrient reductions. It is uncertain what factors control buffer function, yet they continue to be installed with high expectations. Water quality predictions become less accurate in hydrogeologically complex systems such as the Ridge and Valley …
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Nutrient Retention and Cycling in Southeastern U.S. Loblolly Pine (Pinus taeda L.) and Sweetgum (Liquidambar styraciflua L.) Plantations
… (P) are the most common growth limiting nutrients. A key question that arises following fertilization of these soils is whether the applied fertilizer benefits only the current trees in the stand or also improves long-term site quality. The objectives of this study were to compare …
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Effect of Corn Quality and Enzyme Supplementation on Broiler Performance, Gastrointestinal Enzyme Activity, Nutrient Retention, Intestinal Mucin, and Jejunal Gene Expression
… batteries to evaluate feed passage rate and nutrient retention. Digesta samples from gizzard, jejunum, and ileum as well as pancreatic tissue samples were collected for analyses of amylase, protease, and xylanase activities. Intestinal tissue samples were collected for determination of …
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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
… results for improving soil fertility, enhancing nutrient retention, and mitigating environmental degradation in agroecosystems. This dissertation investigates the physicochemical properties of biochar derived from different feedstocks and thermochemical processes, and evaluates their short-term …
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Mechanisms governing phosphorus retention in streams
A nutrient is defined as a chemical element necessary for life. In streams, phosphorus is typically one of the most important nutrients and often limits microbial (algae, bacteria, and fungi) growth. As a result, retention of phosphorus within streams largely determines productivity. Factors that …
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Effects of beaver dam analogs on stream ecosystem function of Crab Creek, Washington State
… the effects of beaver dam analogs (BDAs) on nutrient transport, fish community composition, macroinvertebrate drift, and benthic macroinvertebrate communities of Crab Creek, WA, USA. In 2019, the U.S. Fish and Wildlife Service (USFWS), and Natural Resource Conservation Service (NRCS) placed …
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The effects of augmentation of coarse particulate organic matter in hyporheic sediments
… quality of organic matter affects metabolism and nutrient retention in the hyporheic zone of a low-order Appalachian stream. We hypothesized that hyporheic metabolic rates should increase with organic matter additions because the biotic activity is limited by organic matter availability. Four sets …
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Aquaculture and pollution studies of an Australian fish: silver perch, Bidyanus bidyanus (Mitchell 1838) (Teraponidae)
… grown zooplankton, and quantifies solid and nutrient load from rearing of silver perch at different temperatures. The present study demonstrated that silver perch can grow significantly faster at a temperature close to it's optimum. It also show that sewage grown zooplankton was an …
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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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Temporal and spatial scaling of coupled hydrological and biogeochemical processes in river basins
The goal of this dissertation is to understand nutrient delivery processes in river networks, including the processes and factors controlling both the flow generation and nutrient retention mechanisms. An analysis framework that synthesizes the bottom-up and top-down approaches is implemented in …
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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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Influence of light and algae on nutrient transformations at the sediment-water interface of an agricultural stream
… tracer was injected, and samples were taken for nutrient analysis in the surface and subsurface water at depths up to 8 cm. Dissolved oxygen (DO) and temperature were recorded in order to monitor biotic production. Experiments were conducted over 10 hours, encompassing both light and dark …
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Impact of novel thermal and non-thermal processing on nutritional value and overall quality of papaya and strawberry nectars and their respective blends
Papaya and strawberry are notable for their rich nutrient contents and high antioxidant activities. Though consuming these fruits on their own contribute to a healthy lifestyle, combinations of fruits, such as papaya and strawberry nectar blends, can result in an even greater synergistic impact on …
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Effect of a Water Treatment BMP on Nutrient Spiraling and Leaf Litter Breakdown in an Urban Stream
… compromise valuable ecosystem services, such as nutrient attenuation and carbon processing. A best management practice (BMP) water facility was installed to restore an impaired urban stream in Columbus, GA. This study was conducted to determine the effect of this BMP on nutrient spiraling and …
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A comparison of soil management systems for urban agriculture
… well as ecosystem services including water and nutrient retention. Soil management systems studied include direct soil + synthetic fertilizer (DSF), direct soil + organic amendments (DSO), raised-bed mixture + synthetic fertilizer (RBMF), raised-bed mixture + organic amendments (RBMO), …
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Nutrient release potential during floodplain reconnection: Comparison of conventional and ecological stream restoration approaches
… current stream restoration approaches for their nutrient flushing ability: 1) a conventional approach leaves legacy sediment on the floodplain; and 2) an ecological approach that involves removing the accumulated legacy sediment in order to restore the original floodplain surface wetland, …
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Rice Fortification by Parboiling in Limited-Water Soaking to Alleviate Mineral and Vitamin Deficiency
… vitamin content significantly contributing to nutrient intake in populations with high prevalence of micronutrient deficiencies. Higher nutrient retention rates and improved sensory characteristics are advantages of fortified parboiled rice compared to fortified rice obtained by currently used …
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Development of Carbon-Based, Controlled-Release Soil Ameliorants Through Chemical Pathways
… through chemical carbonization followed by nutrient impregnation. The process involved treating lignocellulosic biomass with 93% sulfuric acid to produce a stable carbon matrix, subsequently neutralized with anhydrous ammonia to incorporate nitrogen. In partnership with Sulvaris Inc. and the …
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Leaf Traits, Neighbors, and Abiotic Factors: Ways That Context Can Mediate the Impact of Invasive Species on Nitrogen Cycling
… services that provision human health, e.g. nutrient retention and water quality.</p><p>We conducted a meta-analysis and in-depth studies focused on the invasive grass species, Microstegium vimineum, to better understand how (i) plant characteristics, (ii) invader abundance and neighbor …
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