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Crop simulation models that accurately predict the availability of N from decomposing plant residues would provide a powerful tool for evaluating legume green manures as potential N sources for nonlegume crops. Using measured data from a series of field experiments conducted on an Oxisol in central Brazil, we conducted this study to test the N submodel of CERES‐Maize for its ability to simulate N mineralization, nitrate leaching, and N uptake by maize (Zea Mays L.) following the incorporation of 10 different legume green manures. Legume or weed residue N at the time of incorporation varied from 25 to 300 kg ha⁻¹ with C/N ratios varying from 13 to 37. Comparison of predicted and measured accumulation of inorganic N in uncropped soil showed that the model usually provided a realistic simulation of legume N release, although N release was overpredicted for some legumes. For all legumes, both simulated …