Open Access
Table 3
SSM_iCrop2 parameter estimates for soybean in Iran.
| Parameter | Name | Value | Reference |
|---|---|---|---|
| Phenolog | |||
| Base temperature for development (°C) | TBD | 7 | (Soltani and Sinclair, 2012) |
| Lower optimum temperature for development (°C) | TP1D | 27 | (Soltani and Sinclair, 2012) |
| Upper optimum temperature for development (°C) | TP2D | 34 | (Soltani and Sinclair, 2012) |
| Ceiling temperature for development (°C) | TCD | 45 | (Soltani and Sinclair, 2012) |
| Temperature unit for emergence or beginning leaf growth (°C) | tuEMR | 68–82 | Parameterization |
| Temperature unit for beginning of seed or fruit growth (°C) | tuBSG | 1200–1440 | Parameterization |
| Temperature unit for termination of seed or fruit growth (°C) | tuTSG | 1700–2088 | Parameterization |
| Temperature unit for physiological maturity (end of dry mass accumulation) (°C) | tuPM | 1700–2088 | Parameterization |
| Temperature unit for harvest or leaf fall (°C) | tuHAR | 2000–2400 | Parameterization |
| Leaf area development and senescence | |||
| Point #1 for normalized leaf area vs. normalized temperature unit (x1, y1) | x1, y1 | (0.15, 0.05) | Parameterization |
| Point #2 for normalized leaf area vs. normalized temperature unit (x1, y1)* | x2, y2 | (0.5, 0.95) | Parameterization |
| Maximum expected leaf area index* | LAIMX | 2.5–4 | Parameterization |
| Temperature unit for beginning leaf senescence (°C) | tuBLS | 1200–1440 | Parameterization |
| Leaf senescence rate coefficient | SRATE | 1 | Fixed for soybean |
| Low temperature / freezing threshold for leaf death (°C) | FrzTh | 8 | (Soltani and Sinclair, 2012) |
| Relative leaf death per each degree below low temperature/ freezing threshold | FrzLDR | 0.01 | (Soltani and Sinclair, 2012) |
| Heat threshold temperature for leaf senescence (°C) | HeatTH | 37 | (Soltani and Sinclair, 2012) |
| Relative increase in leaf senescence rate per each degree above heat threshold (°C) | HtLDR | 0.1 | (Soltani and Sinclair, 2012) |
| Dry mass accumulation | |||
| Base temperature for dry matter production (°C) | TBRUE | 10 | (Soltani and Sinclair, 2012) |
| Lower optimum temperature for dry matter production (°C) | TP1RUE | 20 | (Soltani and Sinclair, 2012) |
| Upper optimum temperature for dry matter production (°C) | TP2RUE | 30 | (Soltani and Sinclair, 2012) |
| Ceiling temperature for dry matter production (°C) | TCRUE | 40 | (Soltani and Sinclair, 2012) |
| Extinction coefficient for photosyntheticaly active radiation | KPAR | 0.65 | (Soltani and Sinclair, 2012) |
| Radiation use efficiency under optimal growth conditions (g MJ−1) | RUE | 1.8 | (Soltani and Sinclair, 2012) |
| Coefficient for response of RUE to CO2 concentration | C3C4 | 0.8 | Fixed for soybean |
| Yield formation | |||
| Maximum harvest index/Liner increase in harvest index (g g−1 d−1) | HImax | 0.34–0.40 | Parameterization |
| Fraction of dry mass remobilizable from the vegetative tissue to the developing seeds/fruits (g g−1) | FRTRL | 0.25 | Parameterization |
| Grain/fruit moisture content (%, dwb) | MC | 13 | Fixed for soybean |
| Water relations | |||
| Temperature unit for beginning root growth (°C) | tuBRG | 68–82 | Parameterization |
| Temperature unit for termination root growth (°C) | tuTRG | 1200–1440 | Parameterization |
| Initial depth of roots at emergence or beginning leaf growth (mm) | iDEPORT | 200 | Fixed for soybean |
| Maximum effective depth of water extraction from soil (mm) | MEED | 1000 | Fixed for soybean |
| Transpiration efficiency coefficient (Pa) | TEC | 4.5 | (Soltani and Sinclair, 2012) |
| FTSW threshold when dry matter production starts to decline | WSSG | 0.25 | (Soltani and Sinclair, 2012) |
| FTSW threshold when leaf area development starts to decline | WSSL | 0.31 | (Soltani and Sinclair, 2012) |
| A coefficient that specifies acceleration or delaying in development in response to water deficit | WSSD | 0.4 | (Soltani and Sinclair, 2012) |
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