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 56 for “"Organic N"”.
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Evaluation of long-term management effects on soil organic N distribution in the Morrow Plots
U of I Only Restriction set for Item 117865 on 2021-06-29T15:03:59Z with date by madinag@illinois.edu.
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Nitrogen cycling in young mine soils in Southwest Virginia
… or coal fragments (nonhydrolyzable organic N). Active N, consisting of hydrolyzable organic N and exchangeable N, comprised the minor fraction of indigenous N available to plants.
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Development of a continuous, physically-based distributed parameter, nonpoint source model
… between four nitrogen pools including stable organic N, active organic N, nitrate and ammonium. Transformations of nitrogen include mineralization simulated as a combination of ammonification and nitrification, denitrification, and plant uptake of ammonium and nitrate. The model maintains a …
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The recovery and behavior of fertilizer nutrients from the anaerobic digestion of poultry manure
… scale digesters. This indicates that added organic N is mineralized. Recovered N and K were associated with liquid fractions and P, Ca, Mg and micronutrients were associated with solids of digested slurries. The mineralization of organic N fran soil applied effluent was 2.3 times greater in …
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A geochemical investigation of the aquatic sediments, groundwater and surface water of the Verlorenvlei coastal lake, with special reference to nitrate transformations
… gives rise to cycling between atmospheric, inorganic and organic forms of nitrogen. Nitrogen cycling is largely controlled by microbial respiration and metabolism. In aquatic systems, N-cycling occurs dominantly in sediments. Removal of nitrogen from aquatic sediments occurs through the …
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Evaluation of nitrogen availability indices
… four laboratory methods to measure extractable organic N (EON), and the accuracy and repeatability of the Horiba Cardy Nitrate meter in determining NO$\sb3$-N content in soils and solution.
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The potential of lime-stabilized and chemically-fixed municipal sewage sludges for land application as lime or nitrogen sources
… in rapid neutralization of soil acidity. Added organic-N was mineralized at an average rate of 32% in surface soils. Based on N mineralization, application rates of lime-stabilized and chemically-fixed sludges will be limited by CCE for most soils. Corn yields on the Glenelg and Tatum soils were …
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Role of Dissolved Organic Nitrogen in the Soil Nitrogen Cycle of Forest Ecosystems
In the last years, dissolved organic N (DON) has been shown to be a crucial part of the soil N cycle in forest ecosystems. Despite this, information on its dynamics, sources and fate is still lacking. Especially data from (sub)tropical forest ecosystems are scarce. Therefore, this study …
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Organic nitrogen uptake by marine algae: consequences for marine ecosystem functioning and biodiversity
Dissolved organic nitrogen (DON) represents a major pool of fixed, reactive nitrogen in marine systems. It is now recognized that this pool can support primary production and the ability of some algal species to exploit DON compounds as sources of Nitrogen (N) may indicate that specific DON …
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Plant nitrogen availability in selected Virginia soils
… non-exchangeable NH₄⁺-N, NO₃⁻-N, total N, and organic matter contents. The samples were also subjected to the anaerobic incubation procedure as an index of organic N availability. Plant available N was measured by N uptake of successive wheat crops grown in the greenhouse. Multiple linear …
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Effects of phosphoroamides on transformations of urea nitrogen in soil
… nitrite accumulation, mineralization of organic N, and gaseous loss of urea N as NH(,3) in soils treated with urea. The phosphoroamides used were N-(diaminophosphinyl)-cyclohexylamine (DPCA), N-benzyl-N-methyl phosphoric triamide, diethyl phosphoric triamide, trichloroethyl …
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Assessment of Exceptional Quality Biosolids for Urban Agriculture
… tests; 3) to investigate EQ biosolids and inorganic fertilizer effects on urban soil properties, vegetable yields, and potential N and phosphorus (P) loss. Biosolids evaluated were products of thermal hydrolysis plus anaerobic digestion (BLOOM), blending with woody mulch (BM) and sand/sawdust …
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A computer simulation model for investigating the effect of land application of sludge on runoff water quality
… processes which occur in the soil following organic waste applications. CREAMS-NT accounts for nutrient addition through fertilization and rainfall and losses of N by volatilization, denitrification, plant uptake, leaching, and overland flow. Data required by CREAMS-NT includes runoff volume, …
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Identifying control points of excessive nitrate load in a pastoral catchment to support lake management
… mainly derived from the mineralisation of soil organic N during low flow conditions; however, the contribution from urine and urea fertiliser sources was dominant during high flow conditions. Antecedent catchment wetness of ~95 mm was identified as a hydrological threshold influencing different …
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Wastewater application to soils: hydraulic and nitrogen considerations
… wastewater containing high concentrations of organic N was spray-irrigated to tall fescue (Festuca arunindinacea) to determine optimum N application levels. Nitrogen balances were determined at each N level and and the potential for predicting the leaching component of the excess N applied was …
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Nitrogen transport and dynamics in grass filter strips
… and dissolved ammonium, and sediment-bound organic N transport during a runoff event. The model simulates the daily percolation and evapotranspiration and dynamics of nitrate, sediment-bound and dissolved ammonium, and sediment-bound organic N in the filter between runoff events. The model …
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Nitrogen values of liquid dairy manure and dry broiler litter as affected by preservation treatment
… of each treatment × farm combination. Organic and inorganic nitrogen concentrations from the preserved manures were compared to the corresponding fresh concentrations of nitrogen in each manure control. Ambient storage, freezing, and refrigeration did not significantly affect (α=.05) …
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Nitrogen Management and the Effects of Compost Tea on Organic Irish Potato and Sweet Corn
… (N) to the soil is a major challenge for organic farmers, especially when growing crops in soils that are in transition from conventional to organic systems. This research evaluated the effects of site produced cover crops and application of soil amendments on N uptake and crop yield of …
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Nitrogen cycling in the subtropical southeast Atlantic and southwest Indian Oceans as recorded by the nitrogen isotopes of modern planktic foraminifera
… a viable proxy for past marine nutrient cycling. Organic N trapped within planktic foraminifer shells is protected from bacterial degradation, with its δ15N recording the processes acting on the upper- ocean N pool. This thesis examines the relationship between local biogeochemi- cal cycling and …
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Effect of tree mortality on biogeochemical response after mountain pine beetle forest infestation, The
… increased proportion of the total N pool was inorganic ammonium, as opposed to more stable and less mobile organic N, which dominates in healthy systems. This change in N cycling was dependent on the extent of surrounding tree mortality in the upper soil horizons, but not in the mineral soil. …
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