Nitrogen fertilizer prices surged 30% in the past week as the Hormuz Strait closure disrupted natural gas supplies that feed ammonia production — the primary input for nitrogen-based fertilizers used worldwide [1].

Qatar and Iran are among the world's top ammonia exporters. Both rely on Hormuz for shipping. The closure切断了 approximately 15% of global ammonia export capacity overnight. Natural gas prices, which feed ammonia plants in unaffected countries, also spiked — creating a double squeeze on fertilizer producers who face both supply cuts and input cost increases [2].

The timing compounds the crisis. Northern Hemisphere planting seasons for winter wheat begin in September and October. Farmers in Europe, South Asia, and North Africa make purchasing decisions in June and July. A 30% price increase at this stage of the cycle forces growers to either absorb costs that destroy margins or reduce planting面积 — both of which feed through to food prices within six to twelve months [1].

The developing world faces the sharpest exposure. Sub-Saharan Africa and South Asia depend heavily on imported nitrogen fertilizers. The 2008 fertilizer price spike contributed to food riots in over 30 countries. The current disruption is structurally larger — the 2008 spike was driven by demand, not supply elimination [3].

Agricultural commodity futures reflected the cascade. Wheat futures rose 8% on Tuesday. Rice futures gained 5%. The market is pricing in reduced yields before a single field goes unplanted [2].

-- THEO KAPLAN, San Francisco