Since the Clean Air Act Amendments of 1990, lakes in Maine and much of the Northeastern US have seen significant shifts in response to reduced atmospheric deposition as well as climate change. The organisms that inhabit lakes are susceptible to environmental change, but our unde…
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Soil testing has become an increasingly important tool in making agronomically efficient production management decisions. N-STaR is a N test used in rice production and is unique in its ability to selectively quantify soil organic-N compounds which are readily mineralizable for …
In maize ( Zea mays L. ), the largest staple crop in the world, nitrogen (N) represents a major limiting factor for productivity. However, improving N use efficiency (NUE) is still one of the most critical research issues to achieve food security in a context affected by climate…
This research was conducted to develop nutrient budgets for almond that guide the rate and timing of fertilizer application. The major objectives of the study were to develop nutrient demand curves, evaluate the response of yield and yield components to nitrogen (N) and potassiu…
The assessment of optimum nitrogen (N) fertilizer need for winter wheat (Triticum aestivum L.) is important for economic and environmental sustainability. A comprehensive understanding of fertilizer N requirement depends on estimation of the quantity of N needed by the crop vers…
Site specific farming systems have the potential to increase farmers' net income by reducing the use of agro-chemicals and applying variable rate technology for areas showing stable yield patterns. This study was designed to: (1) study yield patterns in given fields using variog…
The effect of denitrification within continental margin sediments and suboxic water columns upon the isotopic composition of dissolved nitrogen was studied with the goal of constraining the present and past global oceanic "fixed" (forms other than N\sb2) nitrogen budgets. Sedime…
Magnetic resonance study was carried out for four vanadium model compounds containing sulfur and nitrogen heteroatoms at 9GHz. These systems are Bis(S-methyl-3-isopropyllidenehydrazinecarbodithioto)oxovana- dium(IV); (V1); and Bis(S-methyl-3-cyclohexylidenehydrazinecarbodi- thio…
The fates of nitrogen and dissolved organic carbon (DOC) are of major concern in soil aquifer treatment (SAT) systems, because of their potential to contaminate the groundwater and result in health problem when consumed. Soil surface components play a significant role in the rem…
Scope of study. Nitrogen mineralization of soil organic matter has long been recognized to be very important in meeting plant N needs. Recommendations for N fertilizer requirements for cereals are presently based on the level of nitrate in the top 15 cm of the soil before planti…
Although the restriction index recurrent selection breeding methods have provided some progress in improving both seed protein concentration (SPC) and yield, physiological, biochemical and genetic mechanisms responsible for regulation of SPC in soybean are poorly understood. The…
When ruminants are consuming dormant forage or diets that are high in cereal grains but low in forage, the ruminal microbes may experience growth conditions with excess carbohydrate and limiting nitrogen. To overcome these inadequacies, cattle are provided protein supplements fo…
Inland waters play an important role in the transport, transformation, loss and storage of carbon (C) and nitrogen (N) in the pathway between terrestrial and marine systems. Inland waters can act as both sources to the atmosphere through evasion of GHGs such as CO2, CH4 and N2O,…
Several heterogeneously catalysed reactions have been studied at pressures above and below the critical pressure of carbon dioxide in both carbon dioxide and nitrogen. The purpose of this study was to ascertain if carbon dioxide above its critical pressure and temperature would …
A study of adsorption equilibria of oxygen, nitrogen and oxygen-nitrogen mixtures on types 4A, 5A, 13X and Na-Mordenite molecular sieve pellets has been made. Pure component isotherms, using a volumetric apparatus, have been measured for each gas on each adsorbent at pressures u…
This thesis covers work carried out on algae bioreactors as a tertiary treatment process for wastewater treatment. The process was primarily assessed by the removal of Phosphorus and Nitrogen as an alternative to chemical and bacterial removal. Algal bioreactors would have the a…
Quantifying soil nitrogen transformation processes associated with soil aggregates is noteworthy as microbial communities that are central to N cycle reside in the soil aggregate size fractions. The objectives of this research were: (1) to determine the population size of N mine…
In order to address how aquaculture has influenced the Setiu estuary and lagoon of northeast peninsular Malaysia, foraminifera, sediment grain-size, and carbon and nitrogen isotope ratios and abundances were analyzed in surface samples collected from beneath and around three flo…
Reactive oxygen species (ROS) are a series of molecules, ions, and radicals derived from oxygen that possess remarkable reactivity. They act as signaling molecules when their concentration in cells is within a normal range. When the levels of ROS increase, reaching a concentrati…