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The poll forecast the corn crop would be rated 61 percent good to excellent as of Sunday and the soybean crop rated 60 percent good to excellent, both unchanged from the previous week.
The USDA plans to release its weekly update at 3 p.m. CDT (2000 GMT) on Monday.
Analysts on average estimated the US 2018 winter wheat crop as 38 percent planted by Sunday, up from 24 percent the previous week.