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The poll forecast the soybean crop would be rated 60 percent good to excellent as of Sunday, up from 59 percent the previous week.
The corn crop was seen steady with 62 percent good-to-excellent. Ratings for spring wheat were seen as unchanged at 33 percent good-to-excellent.
Analysts on average estimated the US spring wheat harvest as 57 percent complete by Sunday, up from 40 percent a week earlier.
The USDA was scheduled to release its weekly update at 3 p.m. CDT (2000 GMT) on Monday.