Abstract: Taking GOSSYM model as an example,the theory and methodology for calibration andvalidation of crop growth simulation model were expounded in this paper.The variety and soil parameters of the model used in cotton planting area of Xinjiang were calibrated,some modules of the model were modified, and the result of calibration was also validated. The results show that at two experimental sites, the observational values of soil moisture in 20～40 and 60～80 cm layers in growing season were better identical to those simulated by the model with calibrated soil parameter. The coefficients of simulated and experimental values of six biological indexes of Xi-5 (an early maturity cotton variety) in its growth and development period were all above 0.9,and the relative errors of the simulating yields of three treatments under different cultivation conditions were averaged by 7.5%.

Key words: Crop, Simulation model, Calibration, Validation, Spartina alterniflora wetland, NH₄⁺-N, AP, TP, TN