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Forecasts for hotter and drier weather in key growing areas in the next week sparked a round of buying.
The most actively traded corn contract has risen for seven sessions in a row, rising 12.9 percent during the streak.
It was the longest streak of positive closes for corn since a stretch of equivalent length in April 2016.
Analysts were expecting a US Department of Agriculture report on Wednesday afternoon to show that good-to-excellent ratings for the corn crop fell one percentage point in the latest week.