Previous work calibrating ORYZA for a range of environments identified phenological development rates (Table 2) as the most sensitive factors governing model performance (van Oort et al.,2011,2015) The base crop file used for both calibrations was the“standard crop” file included with ORYZA(v3). Two other calibrated crop files of medium-grain varieties (“Nipponbare” and “Takanari”)were also used as starting points for calibration for M-206 (alsoa medium-grain variety), but resulted in poorer predictions com-pared to the standard crop file. Development parameters were first tuned using the DRATES(v2) program included with ORYZA(v3).DRATES(v2) calculates “optimal” values for each of the four devel-opment rate parameters given the calibration dataset.