Sulfur Shortage From Hormuz Blockade Threatens 2027 Global Food Supply

Forty-five percent of the world's sulfur exports are stuck behind a naval blockade, and 5.4 billion people have no idea.

While the Iran-US conflict dominates headlines as an oil story, a quieter crisis is building underneath it — one that won't show up in gas prices or stock tickers, but will show up in grocery bills and empty fields next year. The Strait of Hormuz isn't just choking off crude. It's cutting the supply of a chemical most people have never thought about, one that sits between phosphate rock in the ground and food on a plate.

Sulfur. Specifically, the sulfuric acid that fertilizer producers need to turn raw phosphate into something plants can absorb. Without it, the entire phosphate fertilizer chain goes dark.

The ingredient nobody watches

Here's how the chain works. Oil refineries produce sulfur as a byproduct — it's stripped from crude during processing. The Middle East, home to some of the world's largest and most sulfur-rich crude reserves, became the world's dominant sulfur exporter almost by accident. Gulf states — Saudi Arabia, the UAE, Kuwait, and Qatar — accounted for roughly 41% of global sulfur exports in 2025. Iran added another 4%. That's 45% of global sulfur trade flowing through one strait.

When the Hormuz blockade choked off oil shipments, it choked off sulfur too. But because sulfur has less commercial value than crude, it gets less attention from the diplomats, the military planners, and the headline writers. Nobody's negotiating safe passage for sulfur barges.

The result: a "sulfur cascade" that's now rippling through the entire fertilizer supply chain.

Morocco's problem is everyone's problem

Morocco's OCP Group is the world's largest phosphate exporter. It sits on massive phosphate rock deposits. But phosphate rock is useless to crops without sulfuric acid to process it. OCP imports 3.7 million metric tons of sulfur annually from the Persian Gulf.

That supply is now cut off.

OCP has begun curbing its own fertilizer exports to preserve what stock it has. This is the domino that connects a naval war in the Persian Gulf to a farmer in Kenya, a rice paddy in Bangladesh, and a soybean field in Brazil.

China faces the same squeeze from the other direction. Chinese fertilizer plants import roughly 4 million metric tons of Gulf sulfur per year. With that supply disrupted, Beijing has restricted fertilizer exports to protect domestic farmers — a move Reuters confirmed on March 19. China needs Brazilian soybeans to feed its livestock. Brazil needs Gulf urea to grow those soybeans. Both need Gulf sulfur to make the phosphate fertilizer that feeds everything else.

The circular dependency has no workaround.

The numbers American farmers are seeing

US retail fertilizer prices tell the story in dollars. Urea has hit $674 per ton — up 14% from last year. UAN28, a liquid nitrogen fertilizer used widely for corn, jumped 31%. DAP, the most common phosphate fertilizer, is up 11%. All eight major retail fertilizer categories tracked by DTN are higher than a year ago, with four up by double digits.

American farmers are making planting decisions right now. The USDA's spring planting survey closes this week. Every farmer calculating input costs is staring at fertilizer bills that have climbed 15-30% in a matter of weeks. Some will plant fewer acres. Some will apply less fertilizer per acre. Either way, yields drop.

This isn't a 2026 food problem. Spring crops planted with less fertilizer produce less grain in autumn 2026, which means less supply entering 2027. The food you'll eat eighteen months from now is being determined by fertilizer prices today.

5.4 billion people in the dark

Albis's Global Attention Index scored this story at 6.45 — deep in the "Information Shadow" tier, meaning it's one of the most invisible stories of the day relative to its impact. Only US and EU media are covering the sulfur-fertilizer cascade. Five regions representing 5.4 billion people — the Middle East, South Asia, Asia-Pacific, Latin America, and Africa — have no coverage of the supply chain that feeds them.

The irony is sharpest in the regions most exposed. India depends on the Gulf for two-thirds of its nitrogen fertilizer imports and faces a monsoon planting season in weeks. The World Food Programme warned that sub-Saharan African farmers "entering planting season risk being unable to treat their crops, resulting in lower yields and higher food prices in the months ahead." The International Fertilizer Development Center (IFDC) issued a specific alert for West, Central, and East Africa, where planting is already underway.

None of these regions are seeing the sulfur story. They'll see the price increases. They won't see why.

Earlier today, Albis's Global Attention Index also flagged Slovenia becoming the first EU country to ration fuel — another cascade endpoint from the same Hormuz disruption, invisible to the same billions.

What happens next

The math is simple and grim. Every week the Hormuz blockade continues, sulfur stockpiles at fertilizer plants shrink. Morocco's OCP has finite reserves. China's plants are cutting operating rates. American farmers are locking in lower application rates for the spring.

If the blockade persists through April, the 2026 planting season in the Northern Hemisphere will produce measurably less food. The consequences arrive in 2027: thinner harvests, higher food prices, and hunger concentrated in the countries that could least afford it and were least warned it was coming.

The war everyone's watching is about oil. The crisis nobody's watching is about the yellow powder that makes food grow. One ingredient. Forty-five percent of global trade. Zero safe passage.

The 2027 food supply is being written right now, in sulfuric acid shortages that haven't made a single front page in five continents.