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The poll forecast the corn crop would be rated 62 percent good to excellent as of Sunday, down from 63 percent the previous week, and the soybean crop rated 60 percent good to excellent, unchanged from a week earlier.
The USDA plans to release its weekly update at 3 p.m. CDT (2000 GMT) on Tuesday, a day later than usual due to Monday's federal Columbus Day holiday.
Analysts on average estimated the US 2018 winter wheat crop as 49 percent planted by Sunday, up from 36 percent the previous week.