Automated Dumas methods could replace Kjeldahl digestions for the analysis of nitrogen (N), but few comparisons of these methods for plant tissue are available. Because N nutrition usually affects tissue levels of N, the influence of analytical method (Dumas and a modified micro‐Kjeldahl without salicylic acid pre‐treatment) on N determination in leaves and petioles of ‘Shogoin’ turnips grown under different N regimes was investigated. Dumas‐ and Kjeldahl‐N ranged from 1.31 to 6.70% and 1.22 to 5.77% in leaves and petioles, respectively, and Dumas‐N was significantly (p<0.01) higher than Kjeldahl‐N. This resulted in a tendency to overrate N status when available thresholds developed with Kjeldahl‐N values were use with Dumas‐N data. However, for turnip, Kjeldahl‐N could be estimated from Dumas‐N in the 1–6% range as: Kjeldahl‐N = ‐0.015(p=0.82)+ 0.858(p<0.001)Dumas‐N (p<0.01, R2= 0.98) , and developing new interpretative data for Dumas N was not necessary.