Corn yield prospects are above average in the eastern half of Iowa, the top growing state, while soybean crop potential is roughly on par with recent years, scouts on an annual crop tour said on Thursday.Farmers in the area largely had an uneventful growing season and enjoyed timely precipitation that boosted growth prospects, including heavy rains on Tuesday and Wednesday, scouts said on the final day of the four-day Pro Farmer Midwest Crop Tour that wraps up in southern Minnesota.Corn yields were estimated at 189.6 bushels per acre (BPA), up from 182.2 BPA last year and the three-year crop tour average of 179.7 BPA, following 10 stops on two routes in Scott, Cedar, Johnson, Linn, Buchanan, Fayette and Winneshiek counties.