Grains-Chicago corn falls ahead of USDA's supply demand report

Meanwhile, market participants remain on edge over the risks of a prolonged interruption to Russian and Ukrainian grain exports from the Black Sea region.

U.S. peace envoys Jared Kushner and Steve Witkoff met Russian President Vladimir Putin in Moscow and Ukrainian President Volodymyr Zelenskiy in Kyiv over the weekend, but their diplomatic efforts did not appear to secure a breakthrough in ending the war.

Ukraine, a top grain producer, has almost completed its 2026 wheat harvest, producing 24.91 million metric tons of the grain at an average yield of 4.94 tons per hectare, the agriculture ministry said on Tuesday.

For soybeans, China said its August imports fell 1.1% in August from a year earlier to 12.14 million tons. From January to August, China's purchases totalled 74.11 million tons, up 1.1% from 73.33 million tons a year earlier, data from the country's General Administration of Customs showed on Tuesday.

Commodity funds were net sellers of CBOT corn and net buyers of wheat, traders said on Tuesday.