Table 3.
Statistics on the observed and simulated data for model performance evaluation.
| Model | Variables | n | Xobs (sd) | Xsim (sd) | P(t*) | β | α | R2 | RMSE | RMSEn % | ID |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ORYZA v3 | Above-ground biomass (kg ha−1) | 25 | 3795 (2437) | 4217 (2949) | 0.58 | −243 | 1.17 | 0.94 | 694 | 18.28 | 0.97 |
| Yield (kg ha−1) | 25 | 1282(1502) | 1358 (1607) | 0.86 | −3 | 1.06 | 0.98 | 191 | 14.88 | 0.99 | |
| LAI | 23 | 1.39 (1.17) | 1.64 (0.89) | 0.39 | 0.75 | 0.64 | 0.69 | 0.47 | 34.21 | 0.88 | |
| APSIM-Oryza | Above-ground biomass (kg ha−1) | 25 | 3795 (2437) | 3864 (3142) | 0.93 | −934 | 1.26 | 0.95 | 608 | 16.02 | 0.97 |
| Yield (kg ha−1) | 25 | 1282 (1502) | 1502(1723) | 0.75 | −34 | 1.13 | 0.98 | 222 | 17.30 | 0.98 | |
| LAI | 23 | 1.39 (1.17) | 1.51 (0.90) | 0.67 | 0.57 | 0.68 | 0.76 | 0.42 | 30.29 | 0.91 | |
| Soil EC (dS m−1) | 346 | 6.09 (3.02) | 6.48 (3.13) | 0.98 | 1.77 | 0.77 | 0.56 | 2.07 | 34.01 | 0.86 |
Xobs, mean of measured values; Xsim, mean of simulated values; sd, standard deviation; n, number of data pairs; P(t*), significance of Student’s paired t-test assuming non-equal variances; α, slope of linear regression between simulated and measured values; β, y-intercept of linear regression between simulated and measured values; R2, square of linear correlation coefficient between simulated and measured values; RMSE, absolute root mean squared error; RMSEn, RMSE normalized by Xobs in percentage; ID, Index of modelling agreement; LAI, leaf area index dynamic value during the crop growth; Soil EC, soil electrical conductivity (dS m−1).