Grains Advance Amid Worsening Backlog of Black Sea Shipping

Wheat and corn rose on worries about grain shipments out of Ukraine as the market seeks clarity over the future of the country’s export corridor.

Grain-hauling vessels are backing upwhile awaiting inspection at Istanbul under the terms of a grain-export deal, creating a logjam as farmers and traders look to ship as much as possible before the accord expires next month. Officials are in talks to extend the agreement.

“For as long as uncertainty remains over whether the sea corridor for grain exports that was negotiated with Russia will be extended beyond November, concerns about supply are likely to ...