SUPHAN BURI, Thailand — Saithong Jamjai has just finished harvesting the rice on the 19 hectares of farmland she owns in central Thailand and now is the time to sow again. But she won’t, she said, because of the U.S.-Israeli war against Iran.

She has gone over the math for weeks. Because of surging prices, driven by the war, of fuel, fertilizer, plastics and other necessities, planting and harvesting will cost her at least $33,000, she said. The grain that she’ll produce, she estimates, will sell in August for only $22,000.