Response of Crop Water Requirement and Yield of Irrigated Rice to Elevated Temperature in Bangladesh

In the changing climatic condition, temperature is most vulnerable parameter and projecting a trend of increase in future. Crop growth development process depend largely on air temperature. This study aims to determine role increasing yield, crop water requirement (CWR), other agronomic parameters irrigated rice. Ceres-rice model associated Decision Support System for Agrotechnology Transfer (DSSAT) was used 15 different locations Bangladesh. Grain duration, widely cultivated rice (Boro rice) variety BRRI dhan28 were analysed normal elevated by 1°C, 2°C, 3°C, 4°C. The result revealed detrimental effect duration grain yield. estimated highest reduction 30 days found Moulvibazar 4°C rise. yield projected 0–17%, 16–35%, 31–49%, 39–61% from condition if seasonal mean increased 4°C, respectively. country average be 405 mm which 445 lowest 358 recorded Chandpur, that CWR reduced 5%, 8%, 12%, 17% over rising temperature, For 1°C rise, life span shortened 6.4 days, 695 kg, decreased 14 mm. declining indicated will require less irrigation water, but it cause considerable loss under Though save huge country-wide Boro cultivation, developers need introduce new heat-tolerant cultivar minimize loss.