3.2 Performance validating of the calibrated GECROS model
With the calibrated posterior distributions of uncertain parameters in GECROS, the performance of the simulations was validated against the data from the 2020 field experiment. The NRMSE andR 2 are listed in Table 6.
Compared with that in the calibration, the performance of the crop model GECROS in the validation tended to become worse, especially forW leaf, N leaf and LAI (Table 6). For simulated W grain andN grain, however, the performance improved in the validation. This was probably caused by the extra field destructive sampling in 2020 at the stage of early grain filling (Fig. S5). The poor performance in simulating W leaf,N leaf and LAI, probably stemmed from the underestimation when leaf growth approached the peak (Fig. S6).