A 27-year study of 19 counties in Isfahan Province has delivered a stark message: barley yields are increasingly at the mercy of the climate. Using panel data from 1996 to 2022, researchers led by Abolghasem Bagheri, Assistant Professor in the Department of Agriculture at Payam-e Noor University, Tehran, demonstrated that technical inputs such as irrigation, machinery, chemical fertilizers, and labor remain powerful levers for growth—yet the rising heat and erratic rainfall linked to climate change are eroding progress faster than expected.
Bagheri’s team found that a 1% rise in average temperature cut barley output by 0.18% per hectare, while a 1% increase in rainfall boosted yields by 0.26%. “We are seeing the paradox of a semi-arid region becoming even drier in some parts while facing more intense rainfall events elsewhere,” Bagheri noted. “These swings are not just statistical noise—they translate directly into market volatility for feed barley and, ultimately, consumer prices.”
The commercial stakes are highest for the energy sector. Barley is a key feedstock for livestock, and livestock production is energy-intensive. As temperatures climb and water becomes scarcer, farmers must irrigate more and cool livestock more often—both of which raise electricity demand. Conversely, if rainfall patterns shift unpredictably, power utilities face sudden spikes in irrigation pumping or prolonged droughts that curtail hydropower output. The study’s estimate of increasing returns to scale—every 1% increase in all inputs yields a 1.09% increase in output—suggests that targeted investments in efficient irrigation and renewable-powered farms could outpace the climate penalty.
Bagheri’s group used EViews12 software and Generalized Least Squares to model 87% of yield variability across Isfahan’s counties. Their findings point to two urgent pathways: first, rapid adoption of climate-resilient seeds and precision irrigation to buffer temperature spikes; second, a pivot toward renewable energy to stabilize both farm operations and regional grid demand. “We cannot change the weather,” Bagheri said, “but we can change how we power agriculture and how we manage water.”
Published in *برنامه ریزی فضایی* (Spatial Planning), the study adds empirical weight to calls for integrated climate-adaptation policies that link water, energy, and agriculture. For energy planners, the takeaway is clear: anticipating climate-driven shifts in irrigation and feed demand is no longer optional. It is a strategic necessity that could determine which power projects get built, which crops get sown, and which markets stay supplied in the decades ahead.