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Showing 1 to 20 of 97 for “"Volatilization"”.
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Ammonia Volatilization and Urease Activity in Turf
… to determine the extent and mechanisms of NH(,3) volatilization from turf whose underlying soil had an acidic pH. Eight different nitrogen fertilizers were evaluated for NH(,3)-N losses after application to turf. The rate and mode of urea application as well as the effects of thatch were also …
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Retranslocation and volatilization of shoot nitrogen during drought in perennial prairie grasses
Decreases in shoot nitrogen (N) and increases in root or rhizome N often appear to coincide with drought in several perennial C$\sb4$ grasses native to tallgrass prairie. This suggests that remobilization of shoot N may occur in response to water stress in these species, which would likely have …
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Hydrolysis of formamide and volatilization of ammonia from nitrogen fertilizers added to soils
… of formamide in soils;Studies on NH(,3) volatilization from various N fertilizers applied to soils (134 mg N/chamber) under laboratory conditions showed that high amounts of NH(,3) were lost in 12 days from urea (33 to 40%) and formamide (31 to 36%) when surface applied to acid and …
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Direct Volatilization of Naphthalene at a Creosote-Contaminated Site with a Phytoremediation System
… plant uptake. However, another mechanism, direct volatilization through the soil, was thought to have significant remediation capabilities at this site. Because naphthalene is a highly volatile PAH, it was hypothesized that naphthalene is volatilizing directly through the soil to the atmosphere …
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Reducing Ammonia Volatilization and Escherichia coli from Broiler Litter Using Multiple Applications of Sodium Bisulfate
… evaluated. Though litter pH, E.coli, and NH₃ volatilization were temporarily decreased with PLT application, the overhead reapplication auger system is not recommended at this time due to moisture and corrosion problems.
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Ammonia Volatilization, Urea Hydrolysis, and Urease Inhibition with the Application of Granular Urea in Agroecosystems
… globally is urea; however, N loss via ammonia volatilization can be great in agricultural systems where urea is surface-applied. The objectives of the experiments reported in this dissertation were: 1) evaluate the performance of a new laboratory ammonia volatilization measurement system for …
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An analysis of air sparging/soil vapor extraction systems emphasizing volatilization kinetics in JP-4 jet fuel
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Experimental validation and reliability evaluation of selected soil VOC leaching and volatilization models used in environmental risk assessment
Includes bibliographical references (page 218).
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Methane Emissions and Ammonia Volatilization from Drill-Seeded, Delayed-Flood Rice on a Silt-Loam Soil in Arkansas
… source, urea, is prone to loss via ammonia (NH3) volatilization. Thus, the objective of this research was to investigate trace gas emissions from rice on a silt-loam soil, including CH4 emissions as influenced by nitrogen (N) fertilization (i.e., optimal N and no N) in 2011, and previous crop …
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Quantifying Greenhouse Gas Emissions and Ammonia Volatilization from Soil Amended with Excreta from Ruminants Fed Alternative Forage-based Diets
… and measured colorimetrically to calculate volatilization over 43 days. Gas samples were collected in the field following the GRACEnet protocol and measured by gas chromatography in order to calculate carbon dioxide (CO2) and nitrous oxide (N2O) fluxes over 42 days. In both trials, the CO2 …
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Rice Grain Yield and Nitrogen Uptake and Ammonia Volatilization from Urea as Affected by Urea Amendment and Simulated Rainfall
… triamide (NBPT) urease inhibitor rate on NH3 volatilization and rice growth. Three field experiments were conducted and NH3 volatilization was measured in two experiments for 11 days after urea application (DAU) in semi-open chambers. Urea or NBPT-treated urea (NBPT-Urea) was subjected to six …
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The potential of immobilied algal cell systems for the removal of mercury from aqueous solution
… a considerable amount of mercury was lost by volatilization. Inunobilized cells accumulated significantly more mercury than non-immobilized cells at higher inoculum densities, probably due to greater growth of immobilized cells. Living cells accumulated significantly more mercury than …
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Nitrogen loss inhibitors in intensively managed winter wheat
… the second season, field measurement of ammonia volatilization was performed in the experiment utilizing urea solution. Addition of monoammonium phosphate significantly reduced volatilization from urea solution applied to winter wheat at both locations; however, weather conditions were such that …
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In situ characterization and quantification of phytoremediation removal mechanisms for naphthalene at a creosote-contaminated site
… site are biodegradation in the saturated zone, volatilization and biodegradation in the vadose zone and phytovolatilization. This is probably the most comprehensive field study of PAH phytoremediation mechanisms conducted to date. The significance of this research is to contribute to predictions …
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An Integrated Approach for Nitrogen Management in Upland Cotton Production
… first study had two objectives: 1) compare NH3 volatilization from surface versus subsurface application/placement of granular (urea) and fluid N source (urea ammonium nitrate; UAN32); and 2) compare NH3 volatilization from urea and UAN treated with enhanced-efficiency fertilizer products. For …
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An investigation into the determination of some volatile elements in silicate rocks employing d.c. arc emission spectroscopy in artificial atmospheres
… resulted in an unacceptable decrease in the volatilization rates of the more abundant volatile elements. Several successful methods of overcoming these reduced volatilization rates were found. Increased amperage coupled with a special electrode design was one while the use of a small carrier …
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Effects of a Control Release Nitrogen Fertilizer and Thinning on the Nitrogen Dynamics of a Mid-Rotation Loblolly Pine Stand in the Piedmont of Virginia
… membrane-N (IEM-N), N mineralization, and N volatilization, in a mid-rotation loblolly pine plantation in the Piedmont of Virginia. In addition, mid-summer and mid-winter fertilizations were compared to assess fertilizer uptake as a function of season. After the summer fertilization, …
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Use of Stable Isotopes to Trace the Fate of Applied Nitrogen in Forest Plantations to Evaluate Fertilizer Efficiency and Ecosystem Impacts
… (EEFs) significantly reduced ammonia (NH3) volatilization losses compared to urea. Mean NH3 volatilization after spring fertilization ranged from 4% to 26% for EEFs versus 26% to 40% for urea, and 8% to 23% for EEFs versus 29% to 49% for urea in summer. Chapter 3 results showed an increase …
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Field and laboratory investigations on the efficacy, selectivity, and action of the herbicide clomazone
… conducted to evaluate efficacy and to quantify volatilization of three clomazone formulations (emulsifiable concentrate, wettable powder, and a microencapsulated formulation) following soil application. Samples were collected at the first, second, and tenth day after clomazone application. The …
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A computer simulation model for investigating the effect of land application of sludge on runoff water quality
… fertilization and rainfall and losses of N by volatilization, denitrification, plant uptake, leaching, and overland flow. Data required by CREAMS-NT includes runoff volume, sediment yield, percolation, and soil environmental conditions which is generated by the hydrologic and erosion components …
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