[[Sulphur]] is a byproduct of Persian Gulf [[gas]] processing and a critical input for [[phosphate]] fertilizers and countless [[industrial]] processes. With [[Qatar]]i sulphur output suspended and regional supply choked, [[price]]s roughly doubled since the start of 2026. That fed straight into diammonium phosphate (DAP): DAP prices rose more than 10% in April 2026 on tightening supply and higher sulphur costs, compounded by [[China]] moving to restrict its own [[export]]s — China relies on the [[Middle East]] for roughly half its sulphur [[import]]s.
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Disruption of the [[Strait of Hormuz]] did not produce one clean shortage; it produced a cascade through interlinked [[chemistry]] — gas into ammonia, ammonia and sulphur into finished fertilizer, export bans stacked on top of [[physical]] shortfalls.