| Coefficient | Definition | Setting |
| TBASE | Base temperature below which no development occurs ˚C | 8.0 |
| TOPT | Temperature at which maximum development rate occurs during vegetative stages ˚C | 34.0 |
| ROPT | Temperature at which maximum development rate occurs for reproductive stages ˚C | 34.0 |
| RUE | Radiation use efficiency, g plant dry matter MJ PAR−1 | 4.0 |
| KCAN | Canopy light extinction coefficient for daily PAR | 0.85 |
| P1 | Thermal time from seedling emergence to the end of the juvenile phase (expressed in degree days above a base temperature of 8˚C) during which the plant is not responsive to changes in photoperiod. | 430 |
| P2O | Critical photoperiod or the longest day length (in hours) at which development occurs at a maximum rate. At values higher than P20, the rate of development is reduced. | 12.50 |
| P2R | Extent to which phasic development leading to panicle initiation (expressed in degree days) is delayed for each hour increase in photoperiod above P20. | 1.0 |
| P5 | Thermal time (degree days above a base temperature of 8˚C) from beginning of grain filling (3 - 4 days after flowering) to physiological maturity. | 600.0 |
| G1 | Scaler for relative leaf size. | 5.0 |
| G2 | Scaler for partitioning of assimilates to the panicle (head). | 6.5 |
| PHINT | Phylochron interval; the interval in thermal time (degree days) between successive leaf tip appearances. | 49.00 |