The future of Malaysia’s rice bowl—its Kedah and Kelantan granary fields—is under pressure, and the numbers tell a stark story. According to new research led by Wan Amiza Amneera Wan Ahmad from Universiti Malaysia Perlis and the University of Malaya, paddy crop water requirements (CWRs) in these regions are set to rise significantly by the end of the century, driven by climate change and rising temperatures. The findings, published in *Environmental Research Communications*, paint a clear picture: water demand for rice cultivation is not just increasing—it’s accelerating, with the main planting season (S2) facing the sharpest rise.
Using advanced climate modeling tools like LARS-WG and three global climate models (BCC CSM1.1, CSIRO-MK3.6, HadGEM2-ES), the study projects future water needs under two greenhouse gas concentration scenarios: RCP 4.5 (a moderate mitigation pathway) and RCP 8.5 (a high-emission scenario). Historical data from 1985 to 2021 was used to calibrate the models, and CROPWAT software was employed to forecast CWRs from 2021 to 2100. The results are eye-opening—baseline water requirements in Kedah and Kelantan currently range from 523 to 659 mm. Under RCP 8.5, this could climb to 560–736 mm by 2100, with percentage increases of 6.9% to 11.8%. Kelantan, in particular, faces the highest temperature rise and the most pronounced water stress, especially under the HadGEM2-ES model.
Wan Amiza Amneera Wan Ahmad emphasizes the urgency of adaptation: “While the off-season remains the most water-intensive period in absolute terms, it’s the main season that’s experiencing the most rapid intensification in demand. This shift makes our rice production systems increasingly vulnerable to climate warming.” The research highlights a critical imbalance: total water use in the off-season (S1) may remain higher, but the main season (S2) is where the percentage increases are most dramatic, signaling a growing risk of water shortages during the period when the majority of rice is grown.
For the energy sector, the implications are substantial. Rice cultivation is water-intensive, and as climate change drives up irrigation demands, so too will the energy required to pump, treat, and distribute water. Higher temperatures and prolonged dry spells could increase reliance on groundwater extraction, raising operational costs for utilities and potentially stressing local energy grids. This research underscores the need for integrated planning—where climate science, hydrology, and energy infrastructure converge to safeguard food security and economic stability.
The study also points to practical solutions: adjusting planting schedules, adopting drought-tolerant rice varieties, and deploying more efficient irrigation methods. These measures aren’t just agricultural strategies—they’re energy strategies, too. By reducing water demand, they can indirectly lower the carbon footprint of rice production, creating a feedback loop of resilience.
As Malaysia and other rice-dependent nations grapple with climate variability, Wan Amiza’s work serves as a wake-up call. The data is clear: the clock is ticking, and the choices made today will determine whether the granary regions of Kedah and Kelantan can sustain their productivity—or face increasing strain on both water and energy systems.