The Iran War Could Trigger a Global Fertilizer Shock

Why It Matters

Reduced fertilizer and energy supplies constrain agricultural output and raise production costs for essential commodities, amplifying food‑price volatility and pressuring global supply chains.

Key Takeaways

• Persian Gulf provides 36% of global urea and 29% of ammonia
• Fertilizer shortages could cut wheat yields in Argentina and Egypt
• 70% of U.S. farmers say they cannot afford needed fertilizer
• Disrupted LNG hampers nitrogen production, threatening global food supply

Pulse Analysis

The Persian Gulf has long been the backbone of the world’s nitrogen‑fertilizer market, delivering more than a third of urea and nearly a third of anhydrous ammonia. With the Iran war choking off these shipments, the region’s contribution to global fertilizer supply has collapsed, invoking Liebig’s Law of the Minimum: a shortfall in a single essential input can throttle overall agricultural productivity, regardless of other resources. This supply shock arrives just as planting seasons begin, magnifying its impact on crop planning worldwide.

Farmers on three continents are already adjusting to soaring input costs. In Argentina, wheat growers are scaling back urea use, while Egyptian producers are halving wheat acreage in favor of less fertilizer‑intensive crops. A recent American Farm Bureau survey shows 70% of U.S. farmers cannot afford the fertilizer they need, a figure that presages lower yields and tighter grain markets. Compounding the issue, diesel prices—critical for farm machinery—have surged, eroding profit margins and potentially prompting further acreage reductions.

Beyond agriculture, the fertilizer disruption signals a broader industrial risk. Energy analyst Vaclav Smil identifies cement, steel, plastics and ammonia as the four pillars of modern production, all of which rely heavily on fossil‑fuel feedstocks. The loss of 20% of global LNG from the Gulf curtails ammonia synthesis, threatening not only food production but also the manufacturing of construction materials and polymers. Policymakers and corporate strategists must therefore consider diversification of feedstock sources and investment in alternative energy‑intensive processes to mitigate the cascading effects of such geopolitical shocks.