The adoption of VRN remains low in this environment as well as others across the world, despite the obvious economic and environmental benefits of this management practice. This study demonstrated that the long-term assessment of spatial and temporal variability of crop yield through historical analysis of yield maps is crucial to determine whether N rates can have a positive response on grain yield. We showed that despite the additional N in T1 (90 kg N ha-1), yield did not increase in areas where N was sufficient and in areas where other factors other than N dominated, the lower amount of T3 (Kg N ha-1), did not penalize the yield when compared to higher N rates