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 480 for “"nitrogen (N)"”.
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Toward circular and sustainable nitrogen (N) management in the US and globally
… have more than tripled the creation of nitrogen (N), enabling unprecedented gains in agricultural productivity. Yet inefficient N use has generated widespread air and water pollution, greenhouse gas (GHG) emissions, and ecosystem degradation, undermining food-energy-water (FEW) …
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Efficient utilization of Macadamia oil cake based diets in ruminants
… a symbiotic relationship. However, because of nitrogen (N) inefficiency, this interdependent relationship loses energy and protein. Strategic feeding of ruminants with diets containing non-conventional feedstuffs appears to be a promising way to enhance proficiency of protein and energy …
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Water stress and remobilization of dry matter and nitrogen in wheat and barley genotypes / by Zeinolabedin Tahmasebi Sarvestani.
… tests the accumulation of dry matter (DM) and nitrogen (N) in the grain and also their remobilization from the shoot to the grain. Water stress during grain filling was found to reduce DM and N accumulation and also to increase N concentration in both wheat and barley grain.
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Effect of Liquid Manure on Corn and Soybean Growth, Nitrogen Uptake, and Yields
… that should provide sufficient quantities of nitrogen (N), phosphorus (P), and potassium (K) for corn, has resulted in uneven growth and reduced grain yields. Field studies were conducted at Pearl City, Illinois, in 1983 and 1984 to evaluate the effects of manure rate, nitrification …
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Modelling material mass balances over wastewater treatment plants
… is to develop a COD (electron), carbon (C), nitrogen (N), phosphorus (P), alkilinity (proton), calcium (Ca), magnesium (Mg) and inorganic suspended solids (ISS) concentrations mass balances models for unit operations in municipal WWTPs. The development of such a model, for both steady state …
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The influence of N, P, K, lime and other factors affecting the growth of container-grown freesia : A thesis submitted in partial fulfilment of the requirements for the degree of Master of Horticultural Science in the University of Canterbury [Lincoln College]
… with emphasis on the following: 1. The effect of nitrogen (N), phosphorus (P) potassium (K) and lime (Ca - as dolomite and agricultural lime) on the growth and flowering of tetraploid freesias. 2. The effect of magnesium (Mg) on growth. 3. The influence of density and shade on freesia development. …
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Nitrogen Rate and Source Effects on Biomass Yield of Teff Grown for Livestock Feed in the Mid-Atlantic Region
… in 2009 and 2010 to determine the effect of nitrogen (N) fertilization rate and source on the yield, nutritive value, and nitrate content of teff. Nitrogen (N) was applied at 0, 45, 90, and 135 kg plant available N ha-1 as a single application of either ammonium nitrate (AN) or broiler litter …
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Sources of nitrogen and phosphorus in stormwater drainage from established residential areas and options for improved management
… Australia), aiming to quantify major sources of nitrogen (N) and phosphorus (P) entering urban residential catchments on two of the major dunal systems. The export of N and P from these catchments in stormwater discharge was measured, allowing investigation of some of the key pathways through …
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Microbial responses to plant functional types and historical resources additions in the shortgrass steppe
… through influence on the levels of inorganic nitrogen (N) and labile carbon in the rhizosphere. This is particularly important in the shortgrass steppe (SGS), where plants with the C3 or C4 photosynthetic pathway differ in phenology, which affects the timing of maximum N uptake and root …
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Recovery of Nitrogen-15-Labeled Liquid Anhydrous Ammonia Applied to Soil
… ammonia (LAA) is the most extensively used nitrogen (N) fertilizer in U.S. and Illinois agriculture, knowledge concerning its transformations in soil is limited. The understanding of LAA transformations and the products it forms in soil are agronomically important because they ultimately …
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Evaluation of batch test for measurement of active biomass in activated sludge mixed liquor
… for the biological removal of carbon (C), nitrogen (N) and phosphorus (P). This implementation has been aided by the development of a suite of steady state design models (e.g. WRC, 1984; Wentzel et aI., 1990; Maurer and Gujer, 1994) and kinetic simulation models (e.g. Dold et al., 1980, …
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Nitrophosphate as an alternative phosphate fertiliser for acidic sandy soils
… practice to use large quantities of reduced nitrogen (N) such as urea, ammonia (NH3) and ammonium (NH4+) as pre-plant (before planting) fertilisers in the Free State, Mpumalanga and North West where farmers apply monoammonium phosphate (MAP(33)) together with urea before planting. However, …
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Analysis of management factor contributions to high-yielding corn production systems
… system. The five management factors (non-nitrogen (N) fertility, N fertility, hybrid trait, plant population, and fungicide application) were evaluated by establishing 2 levels (traditional and advanced) of each factor. Twelve total treatments consisted of a High Technology (HT) treatment …
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Nitrogen cycling in young mine soils in Southwest Virginia
Deficiency of available nitrogen (N) is one of the major factors limiting the establishment of a long term self-sustaining vegetative community on mine soils. This investigation was conducted to study the nature of N form and dynamics in southwest Virginia mine soils. Fresh mine spoils contained a …
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Effect of Alcohol Treatments on Soybean Meal Utilization by Ruminants
… effect on protein solubility, in situ rate of nitrogen (N) disappearance, and in vitro ammonia release from both soluble and insoluble SBM proteins. In all studies, the effect was largest for the 40% (v/v) propanol treatment. Among alcohols, isopropanol showed the least effect followed by …
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Methane Emissions and Ammonia Volatilization from Drill-Seeded, Delayed-Flood Rice on a Silt-Loam Soil in Arkansas
… Another concern is pre-flood fertilizer nitrogen (N) management, as 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 …
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The Utilization of Dietary Fiber and Its Effects on The Utilization of Other Dietary Components by Swine
… on the utilization of dietary dry matter (DM), nitrogen (N), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose (H) and digestible energy (DE) by growing swine. For weanling pigs, fecal N excretion was increased and N retention was decreased by the addition of either of …
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Protein supplementation and comparative feeding value of alkaline hydrogen peroxide-treated wheat straw-containing diets fed to cattle and lambs
… the dietary CP level needed to maximize nitrogen (N) retention and fiber digestibility. Soybean meal (SBM) replaced corn to increase levels of CP (range = 6 to 16% CP). Maximal N retention (% of N intake) and NDF digestibility were obtained with 12% CP. Similar treatments (8.5, 11, 13.5, …
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Wintertime nitrate isotope dynamics in the Atlantic sector of the Southern Ocean
… the first data on wintertime patterns of the nitrogen (N) and oxygen (O) isotopes of seawater nitrate for the region south of Africa. Water column profile and underway surface samples collected in July 2012 span a range of latitudes from the subtropics to 57.8°S, just beyond the Antarctic …
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The production and fate of nitrogen species in deep-sea hydrothermal environments
Nitrogen (N) species in hydrothermal vent fluids serve as both a nutrient and energy source for the chemosynthetic ecosystems surrounding deep-sea vents. While numerous pathways have been identified in which N-species can be produced and consumed in the context of submarine hydrothermal vent …
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