Nitrogen fertilization is a research area that focuses on studying the effects and benefits of adding nitrogen-containing compounds to soil as a way to improve plant growth and yield. Nitrogen is essential for plant growth and is often a limiting factor in agricultural production. Researchers in this area explore different nitrogen fertilization methods and formulations, their impact on soil health and nutrient cycling, as well as their environmental implications such as nitrogen leaching and greenhouse gas emissions. The goal of nitrogen fertilization research is to optimize the use of nitrogen fertilizers to increase crop productivity while minimizing negative environmental impacts.