Abstract: Reasonable application rate of nitrogen fertilizer is pivotal for improving nitrogen use efficiency. Various recommendation methods for nitrogen fertilization have been approached in recent several decades, such as the nitrogen response function method, the Stanford formula, formula fertilization based on soil testing, integrated nutrient management, computer decision systems (such as nutrient expert systems), etc. While each of these methods boasts its own merits, they necessitate a certain level of professional expertise and nutrient testing facilities. In response, this study proposed a straightforward method for determining the total nitrogen fertilizer requirement, grounded in the “optimal partial factor productivity of nitrogen (PFPN_opt)”. This method leverages the nitrogen response curve derived from nitrogen gradient experiments conducted across multiple sites within a specific region. By identifying the maximum yield and the corresponding optimal nitrogen fertilizer application rate, PFPN_opt is calculated as the ratio of the highest crop yield to the best nitrogen fertilizer application rate. In practical terms, once the target yield for a particular field plot is estimated, the recommended nitrogen fertilizer quantity can be readily derived using the formula: recommended N fertilizer = target yield/PFPN_opt. This approach is user-friendly, as it obviates the need to account for challenging-to-estimate parameters such as soil nitrogen supply capacity and nitrogen fertilizer utilization efficiency. Consequently, it mitigates potential errors associated with soil sampling, testing, and recommendation index formulation, thereby facilitating its adoption by agricultural technicians and farmers alike. To illustrate the method’s viability, this study employs corn as a case study and delves into the considerations that should be taken into account during its implementation.