Modern agriculture is often portrayed as an industry driven by technology, efficiency, and connectivity. Yet the latest turmoil in global fertilizer markets is a reminder of an uncomfortable truth: a significant share of farm profitability still depends on geopolitical decisions made thousands of miles away from any cornfield, soybean farm, or wheat operation.

The ongoing conflict involving Iran is not only reshaping military alliances and energy markets. It is also disrupting one of the most critical inputs in global agriculture: fertilizer. And just as happened after Russia's invasion of Ukraine in 2022, farmers are once again discovering that wars eventually find their way into the field-even when no tanks are rolling down rural roads.

The Strait of Hormuz, now at the center of global tensions, remains one of the most important corridors for fertilizer trade. Roughly 49% of the world's urea, 30% of anhydrous ammonia, 44% of sulfur, and 16% of phosphate fertilizers move through this narrow waterway. When shipments slow or stop, global markets react faster than any planter can move across a field.

The impact is already visible. Since the conflict escalated, urea prices have surged by approximately 43%, while other nitrogen fertilizers have posted increases of more than 30%. Phosphate fertilizers have also become more expensive, raising concerns not only for the current crop year but for future planting seasons as well.

Ironically, the United States does not rely heavily on fertilizer imports from the Persian Gulf. More than half of U.S. fertilizer imports originate in Canada, while imports from the Gulf region account for less than 10% of total volumes. Yet fertilizer pricing is increasingly determined by a handful of large global companies operating in a highly interconnected market.

In other words, the fertilizer may not come from Iran, but the price increase certainly can.

This reality highlights one of the greatest vulnerabilities facing modern agriculture. Farmers can invest in precision agriculture, optimize nutrient applications, improve yields, and manage risk through crop insurance and marketing strategies. What they cannot easily manage is a geopolitical shock that suddenly disrupts global supply chains.

The burden is also far from equal. Larger operations often have the financial flexibility to pre-book fertilizer supplies, lock in prices, and secure inventory months in advance. Smaller farms, however, are frequently forced to buy closer to application periods, leaving them more exposed to price spikes and availability concerns.

Once again, scale becomes a competitive advantage that extends beyond operational efficiency.

The bigger issue may not be the 2026 crop. It may be 2027.

Many U.S. producers will begin planning and prepaying fertilizer needs for next year's crop by early fall. If the conflict continues or expands, today's supply disruptions could evolve into a prolonged period of elevated fertilizer costs. Analysts already estimate that fertilizer expenses could represent more than 21% of total corn production costs, significantly above historical averages.

At the same time, there are few signs that commodity prices will rise enough to offset higher input expenses. Corn and soybean markets remain under pressure, while farmers continue facing elevated costs for fuel, labor, equipment, and financing.

The result is a dangerous squeeze on farm margins.

Recent history offers a clear lesson. Following the war in Ukraine came a global fertilizer crisis. Now Iran threatens to write the next chapter. Once again, farmers find themselves cast in a familiar role: unwilling spectators of distant conflicts and involuntary financiers of their economic consequences.

Because in the end, wars may be fought on strategic maps and diplomatic stages, but the invoices always find their way back to the farm.

And unlike missiles, those invoices rarely miss their target.