Ammonium nitrate-15N2 is widely used as a stable isotope-labeled compound in agricultural and environmental research. It serves as a tracer to study nitrogen cycling in soils, helping scientists understand how nitrogen moves through ecosystems, including processes like nitrification, denitrification, and plant uptake. This compound is also utilized in metabolic studies to track nitrogen assimilation in plants and microorganisms. Additionally, it plays a role in developing and calibrating analytical techniques such as mass spectrometry and nuclear magnetic resonance (NMR) spectroscopy for nitrogen analysis. Its application is critical in advancing sustainable farming practices and improving nitrogen use efficiency in crops.