
The Rosario December 2026 corn contract rose to US$187.5 per tonne at A3 Mercados, moving against lower Chicago prices. Argentine export registrations reached 3.38 million tonnes in November, and USDA technical staff estimated Ukraine could export only 10.2 million tonnes of corn because of the Black Sea logistics blockade.
Local Argentine prices diverged from Chicago on strong export registrations, while the Ukrainian export shortfall from port blockades supports demand for Argentine corn. Chicago's weakness still caps the upside for export parity prices.
Not enough comparable past events yet for a historical read.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.