Two weeks after the strait closed, the agricultural consequences are becoming clearer than the geopolitical ones. Roughly a third of world seaborne fertilizer trade is stranded, European ammonia production costs have risen 65 percent since January, and the Northern Hemisphere planting season is starting now.

Where things stand

Following the military escalation that began on 28 February, Iran has declared the Strait of Hormuz closed to Western aligned merchant shipping. As of yesterday, more than 150 tankers and bulk carriers were reported anchored outside the Persian Gulf, unable to secure war risk insurance or naval escorts. Shipping activity through the strait has fallen by around 75 percent.

Container trade is caught in it too. Up to 470,000 TEUs of capacity were initially trapped inside the Gulf, affecting roughly 10.7 percent of the global container fleet by capacity, with Suez transits suspended alongside the Hormuz disruption.

QatarEnergy has declared force majeure. Europe sources 12 to 14 percent of its LNG from Qatar, all of it previously transiting the strait. Japan, which historically draws 91 percent of its crude imports from Hormuz dependent economies, has asked its government to release strategic petroleum reserves. South Korea faces comparable exposure.

The strait carries roughly one fifth of world oil supply and close to a third of seaborne fertilizer trade. It is the second of those numbers that this note is concerned with.

The fertilizer problem is the agricultural problem

The immediate market focus has been on energy. The more durable damage is to crop inputs.

Approximately 16 million tonnes of annual fertilizer capacity is effectively trapped inside the Gulf, removing close to 35 percent of the world's seaborne urea trade at a stroke. IFPRI estimates as much as a third of global fertilizer trade could be affected if the disruption persists.

The price response has already decoupled from the historical relationship with energy. Platts calculated European ammonia production cost at 652 dollars per tonne yesterday, including carbon costs, against 396 dollars on 5 January, an increase of around 65 percent, as Dutch TTF front month settled at 50.78 euros per megawatt hour against 27.41 euros at the start of the year. Ammonia and urea are now moving on scarcity rather than on gas.

Two mechanisms drive the agricultural damage from here, and both operate with a lag that means the market will underprice them for months.

Reduced application rates. Farmers facing nitrogen at these levels apply less of it. Lower application means lower yield, and the effect shows up at harvest, not at planting.

Acreage substitution. Farmers shift toward less input intensive crops. That changes the balance sheet of every commodity in the rotation, and the shifts do not reverse quickly once made.

The timing is close to worst case. This is landing precisely as Northern Hemisphere farmers need to secure inputs for the 2026 season. Fertilizer is not a commodity that can be bought late.

Freight is the second cost layer

The routing consequences compound the input costs.

Emergency and war risk surcharges are being applied across Gulf linked corridors. Cape of Good Hope rerouting adds ten to fourteen days per voyage on affected lanes. The Red Sea route to Europe was already operating at 49 percent below pre crisis capacity before this began, and the current escalation removes any near term prospect of a return to Suez routing.

For soft commodities specifically, higher shipping rates, insurance costs and bunker prices raise the landed cost of every tonne of cocoa, coffee and sugar moving on long haul routes, independently of anything happening in a growing region.

The food security dimension

The UN World Food Programme, IFPRI and S&P Global have all now flagged the same concern: the conflict's effects are spreading well beyond the region through fuel, freight and fertilizer, all of which are inputs to food production, at a point when food inflation had only recently begun to abate.

UNCTAD issued a formal warning this month of heightened risk to energy supply, fertilizer supply and vulnerable economies, noting that many developing nations already carrying high debt burdens and constrained fiscal space are particularly exposed to elevated freight and food costs. The comparison it drew was to the compounding shocks of the pandemic and the early Ukraine war period.

That comparison carries a specific commercial warning. In both of those episodes, the response of producing governments facing domestic food price inflation was to restrict exports. The chain runs from chokepoint closure to fertilizer scarcity to yield pressure to domestic inflation to export restriction. Clients with exposure to origin supply from India, Southeast Asia or North Africa should be modelling that possibility now rather than reacting to it later.

The sugar transmission nobody has priced

One connection deserves specific attention because it is not yet reflected in the sugar market.

Brazilian mills operate a flexible crushing model, switching cane between sugar and ethanol depending on which delivers the better return. Elevated crude prices raise ethanol netbacks. If crude stays where the current disruption has put it, and if Brasília subsidises fuel to contain domestic pump prices, Brazilian mills will swing toward ethanol and away from sugar.

World sugar number 11 is currently trading in the mid teens, with funds holding a position close to the record net short of 239,232 lots reported for the week ended 3 February. The market is positioned for surplus. A sustained energy shock that pulls Brazilian cane into ethanol would undermine that position, and the market does not appear to be considering it.

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