Nitrogen cycling refers to the process by which nitrogen is transformed and transferred between various chemical forms and reservoirs in the environment. This includes nitrogen fixation, nitrification, denitrification, and ammonification, among other processes. Nitrogen is an essential nutrient for all living organisms, and understanding nitrogen cycling is important for maintaining healthy ecosystems and managing agricultural systems. Research in this area seeks to better understand the drivers and dynamics of nitrogen cycling, the impacts of human activities on nitrogen cycling, and potential strategies for mitigating nitrogen pollution and improving nitrogen use efficiency in agriculture.