Agricultural soils are major contributors to nitrous oxide (N2O) emissions, primarily due to nitrogen-based fertilizers. Effective nitrogen management is crucial for greenhouse gas mitigation. Cover crops are increasingly recognized for their capacity to absorb and retain excess nitrogen after harvest. This study investigates the nitrogen contributions from different cover crop species in the subsequent corn by gas sampling throughout the corn season. Results will guide the development of optimal cover crop mixtures, reducing emissions and enhancing soil health.