Abstract: “One of the most widespread environmental problems is petroleum hydrocarbons contamination in soil and groundwater environments. Among the components of petroleum hydrocarbons, n-alkanes constitutes highest proportion and are the most readily biodegraded components. Bioremediation is a low cost and environmentally friendly technology in order to cleanup soil and groundwater contamination. Nutrient enhancement of bioremediation with nitrogen and phosphorus is called “biostimulation”, and increases process performance. Especially nitrogen is the most important nutrient for the hydrocarbon bioremediation due to the elevated carbon concentrations compared to nitrogen in petroleum contaminated soils. Many researchers have investigated optimum nitrogen levels in order to enhance bioremediation. However there is a limited number of studies on the effects of different nitrogen sources on n-alkane biodegradation in soil. In this study, it is aimed to reveal the effects of different nitrogen sour”

Keywords: Biodegradation, Biostimulation, n-Alkane, Nitrogen, Diesel