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Traders said that smaller-than-expected rainfall totals in Iowa, the largest production state for corn, this week added strength to the market.
But gains were kept in check by forecasts for cool weather in the US Midwest that will help corn pollinate.
The US Department of Agriculture earlier on Thursday said that weekly export sales of corn totaled 578,600 tonnes in the latest week. Analysts were expecting corn export sales between 400,000 tonnes and 900,000 tonnes.