Relationship between Grain Crop Yield Potential and Nitrogen Response

Agronomy Journal 105:1335–1344 (2013). doi:10.2134/agronj2013.0034 The independence of RI and YP0 article that we published in Agronomy Journal has the y axis labeled incorrectly. The graphs list bu ac−1 data but the y axis is labeled Mg ha−1. The authors regret this error. The correct Figures 1 and 2 are included below. Winter wheat grain yield response to fertilizer N applied, Stillwater, OK, 1958 to 2011 (Check–no N applied, High–N ranged from 37–67 kg N ha−1). Winter wheat grain yield response to fertilizer N applied, Exp. 406, Altus, OK, 1966 to 2011 (Check–no N applied, High–N was 179 kg N ha−1).