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Most-active CBOT December corn hit upside resistance near its 100-day moving average and found support near its 10-day moving average.
Corn also was pressured by a more than 2 percent drop in CBOT wheat futures, with US grain prices overall easing as a strong dollar made US commodities more expensive in some global markets.
Analysts polled by Reuters expected the US Department of Agriculture in a weekly report due at 3 p.m. CDT (2000 GMT) to show the US corn harvest at 60 percent complete, up from 46 percent last week.