Assessing the Impact of Climate Change on Water Requirement and Yield of Sugarcane Over Different Agro-climatic Zones of Tamil Nadu

The DSSAT CANEGRO model was calibrated and verified using field experimental data from five Tamil Nadu Agroclimatic Zones (1981–2022). The genetic coefficients of the sugarcane cultivar CO-86032 were calculated. R 2 obtained between measured and simulated stalk fresh mass was 0.9 with the nRMSE (0.01) and RMSE (1.6) and R 2 between measured and simulated sucrose mass was 0.9 with the nRMSE (0.16) and RMSE (1.2). For yield R 2 obtained between measured and simulated was 0.9 with the nRMSE (0.01) and RMSE (1.6). As a result, the CANEGRO model may be used to mimic the phenology and yield features of the sugarcane cultivar (CO-86032) in Tamil Nadu's Agro Climatic Zones. The increasing temperature lowered the yield to varying degrees in each ACZ. A 2 o C increase frequently leads in a 3% loss in average yield. A 3 o C increase in temperature reduced yield by 5%, and a 4 o C increase in temperature reduced yield by 9%.The WR rose throughout all of the ACZ due to the high temperature, but to differing degrees. A 2 o C increase often results in an average 4% increase in the WR. The WR rose by 9% when the temperature was raised by 3 o C, and by 13% when the temperature was raised by 4 o C.