Chuang Cheng-deng’s modest rice farm is a stone’s throw from the nerve center of Taiwan’s computer chip industry, whose products power a huge share of the world’s iPhones and other gadgets.

This year, Chuang is paying the price for his high-tech neighbors’ economic importance. Gripped by drought and scrambling to save water for homes and factories, Taiwan has shut off irrigation across tens of thousands of acres of farmland.

Authorities are compensating growers for the lost income. But Chuang, 55, worries that the thwarted harvest will drive customers to seek out other suppliers, which could mean years of depressed earnings.