This study investigates the effects nitrogen application ways (surface - subsurface fertilization) on the growth, yield, and fruit quality of ten-year-old Murcott mandarin trees grafted on sour orange rootstock under sandy loamy soil conditions in Belbeis district, Sharkia governorate, Egypt. Conducted over two growing seasons (2021/2022 and 2022/2023), the research evaluated the impact of different nitrogen doses (600 g, 800 g, and 1000 g) and application methods (surface vs. subsurface) on tree growth parameters, nutrient content, fruit yield, and quality. Results indicated that 1000 g N combined with subsurface application (S.S.A.) significantly enhanced tree height, canopy volume, and fruit yield, with the highest tree yield (77.78 kg and 99.78 kg) and hypothetical yield per feddan (16.34 tons and 20.95 tons). Subsurface application improved nitrogen use efficiency, reducing nitrogen losses through leaching and volatilization. The study highlights the importance of balancing nitrogen application methods to optimize productivity and fruit quality while minimizing environmental impacts. These findings align with global efforts to promote sustainable citrus production through precision agriculture, as emphasized by FAO (2022). The research concludes that subsurface nitrogen fertilization, when combined with appropriate nitrogen doses, offers a viable strategy for enhancing Murcott mandarin production, contributing to food security and environmental sustainability.