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The poll forecast the corn crop would be rated 62 percent good to excellent as of Sunday and the soybean crop rated 61 percent good to excellent, both steady with the previous week.
Analysts on average estimated the US spring wheat harvest as 88 percent complete by Sunday, up from 76 percent the previous week.
The USDA was scheduled to release its weekly update at 3 p.m. CDT (2000 GMT) on Tuesday, a day later than usual due to Monday's federal holiday.