For each zone, the sensitivity of yield change to Tmean, precipitation and SRD change during a growth period, i.e. the panel model parameter ˇ2, ˇ3, and ˇ4, respectively, was estimated using multiple regression method based on the trial data on yield and climate from 1981 to 2009 across the stations in the zone. The sensitivitywas further expressed in percentage of actual mean yield acrossthe stations during the study period as