Abstract:Based on the relationship between nitrogen fertilizer and the production of rapeseed and the changes of nitrogen use efficiency, this study estimates N2O mitigation potential from rape planting through soil testing and formulated fertilization in Hubei Province. The application of soil testing and formulated fertilization will bring theoretically 646.32kt CO2-eq emission reductions in Hubei Province. Based on the current status of soil testing and formulated fertilization in rape planting, the extensive applications of this measure will produce 173.91kt CO2-eq reduction, accounting for 13.98% of total N2O emission caused by nitrogen fertilizer from rape planting. The measure improves the nitrogen use efficiency by balancing the nutrient supply, thereby reduces the corresponding N2O emission. Therefore, soil testing and formulated fertilization is an effective means to mitigate agricultural N2O emissions, and reduce surplus capacity of nitrogen in environment.