But the United States, the world's top corn producer, is now expected to harvest its smallest corn crop in three years. That would be fewer days of corn stocks than the world had in 2012, when the last global food crisis spurred riots. Ukraine is expected to harvest 25 to 27 million tonnes of corn in 2022, down from 42.1 million tonnes in 2021, following Russia's invasion, according to official estimates. read moreSanctions related to the war mean Russia has also struggled to export what is expected to be a record-large wheat crop. read moreAgricultural lender Rabobank said the next U.S. wheat crop is also at risk and will be planted in dust this autumn unless rains fall.

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