DSSAT- CSM simulate crop production considering weather, genetics, soil water , soil carbon and management in single or multiple seasons. in this study, treatments with 6-day irrigation period were used in the calibration process. Then grain yield and biomass of maize were evaluated at harvest maturity. Genetic coefficient required by this model including P1, P2, P5, G2, G3, and PHINT were found to be 240 (°C), 0.2 (days/hr), 850 (°C), 855, 10 (mg/day), and 53 (°C), respectively. The result indicated the model was able to simulate grain yield and biomass for maize accurately normalized with root mean square errors, Wilmot s index of agreement and coefficient of determinations 18, 22, 82 percent and 29,84, 86 percent respectively. So CERES-Maize model for simulating grain yield and biomass in Lahijan branch has good results and can be used for irrigation-fertilizer management.

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