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Showing 1 to 20 of 21 for “"Ammonia 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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Reducing Ammonia Volatilization and Escherichia coli from Broiler Litter Using Multiple Applications of Sodium Bisulfate
Ammonia (NH₃) emissions from animal manure, such as poultry litter, can cause air quality problems. These emissions also result in excessive nitrogen (N) loading into aquatic environments which can lead to water quality problems where N is the limiting nutrient for eutrophication, such as the …
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Ammonia Volatilization, Urea Hydrolysis, and Urease Inhibition with the Application of Granular Urea in Agroecosystems
… N source 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 …
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Methane Emissions and Ammonia Volatilization from Drill-Seeded, Delayed-Flood Rice on a Silt-Loam Soil in Arkansas
… the common N 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 …
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Quantifying Greenhouse Gas Emissions and Ammonia Volatilization from Soil Amended with Excreta from Ruminants Fed Alternative Forage-based Diets
… as the negative control (10 treatments, n = 4). Ammonia (NH3) was trapped using a modified acid-trap method 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 …
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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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Some physical and chemical aspects of ammoniacal nitrogen in soils
… of hydroxylamine as an intermediate between ammonia and/or ammonium ion and nitrite was not supported by the data obtained. It was shown that in acid solutions nitrite may thermodynamically undergo three reactions; it may decompose to nitric oxide, oxidize to nitrate or be reduced to nitrous …
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Nitrogen loss inhibitors in intensively managed winter wheat
… In 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 …
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Chemisorption of ammoniacal nitrogen by clays
… was employed to evaluate chemisorption of ammonia by clays under moist conditions. In equilibria involving ammonia, all factors favoring volatilization losses of gaseous ammonia would undoubtedly exert an influence on the ultimate equilibria which are reached. Investigation of the …
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Some physico-chemical and biological aspects of urea
… molecule. 2. Mechanisms of urea hydrolysis and volatilization in soils The biological or catalytic hydrolysis of urea is rapid and can be related to soil microbial activities. The reaction rate of the chemical hydrolysis of urea is very slow and insignificant in comparison with the biological or …
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Managerial and Nutritional Manipulation to Reduce Swine Odor
… to dietary manipulation to reduce urine pH, ammonia volatilization, and ultimately swine odor. Four studies involving grow-finish pigs were conducted to investigate the effect of fiber source, source and inclusion of dietary acidifiers, crude protein level, and finally the effect of crude …
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Effects of phosphoroamides on transformations of urea nitrogen in soil
… urea hydrolysis, nitrite accumulation, and ammonia volatilization in soils treated with urea. None of the phosphoroamides studied significantly affected denitrification of nitrate or mineralization of organic N (as alanine) when applied at the rate of 10 or 50 (mu)g g('-1) soil, and only …
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Effects of Manure Injection on Transport and Transformation of Nutrient and Antibiotics
… is injected. Subsurface injection eliminated ammonia volatilization and N loss in runoff and increased soil inorganic N when compared to surface application after volatilization, incubation, and rainfall simulation studies. Although these benefits did not translate to higher yields in …
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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
… fertilizers (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 …
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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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Dialing in the most corn-profitable and environmentally responsible nitrogen rate
… N loss measurements of nitrate (NO3-N) leaching, ammonia (NH3-N) volatilization, and nitrous oxide (N2O-N) emissions. The mean economic optimum N rate (EONR) was 173 kg N ha-1, with a coefficient of variation (CV) of 23%, corresponding to an optimum range of 133 to 213 kg N ha-1. Above this …
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Nitrogen dynamics and biological response to dairy manure application
… laboratory incubation, manure injection reduced ammonia volatilization by 87% and 98% in a sandy loam and clay loam soil, respectively. The increased ammoniacal nitrogen recovery resulted in increases of soil nitrate of 13% for the sandy loam and 26% for the clay loam after 40 days of incubation. …
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The Effects of Manure Handling and Dietary Protein on Ammonia Fluxes from a Flush Dairy
Atmospheric ammonia (NH₃(g)) poses an environmental concern mainly due its ability to form fine particulate matter (PM2.5 with a diameter smaller than 2.5 micrometers) in the form of ammonium nitrate (NH₄NO₃) and ammonium sulfate ([NH₄]₂SO₄). These forms of PM2.5 may reduce visibility, contribute …
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Development of novel fertilizer manufacturing processes using human urine
… nitrogen source in urine (urea) breaks down to ammonia and is lost to the atmosphere. This thesis investigated the technical feasibility of using different membrane and freezing techniques to concentrate and recover nutrients from human urine. It assessed different stabilization methods (to …
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Concentrating human urine by evaporation
… due to nitrogen (N) being derived from synthetic ammonia (NH3) produced via the energy intensive Haber-Bosch process. The phosphorus (P) in synthetic fertilizer is also mined from non-renewable phosphate rock. Similarly, a large population size leads to the inevitable generation of waste effluents …
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