Chicago Board of Trade corn futures advanced on Tuesday on uncertainty over the size of the forthcoming US harvest, with the most-active contract reaching its highest price since August 12, traders said.

Traders are uncertain about the harvest after heavy rains and flooding delayed spring planting.

The USDA heightened supply concerns on Monday when it reported US corn stockpiles were 2.114 billion bushels at September 1, below analyst projections and down year on year.

Copyright Reuters, 2019