U.S. corn and soybean conditions slipped for the second week in a row last week as excessively wet weather hurt crops in parts of the Midwest and hot, dry weather stressed the crop in the Delta/Southeast.

In its weekly crop update, USDA rated U.S. corn conditions 73% good/excellent as of Sunday, down from 73% a week earlier and just one percentage point above a year earlier.

Corn development remains ahead of schedule with 7% of the crop reported silking, compared with 4% a year earlier and the five-year average of 5%.

Soybean conditions were rated 67% good/excellent as of Sunday, down from 69% a week earlier and 68% a year earlier.

Soybean planting progress rose 4 percentage points to 97%, which was on par with the five-year average, with emergence up 6 points to 93%, also on par with average.

USDA reported that 9% of the U.S. soybean crop was blooming, up from 4% a week earlier and on track with the five-year average of 9%.

In the top producing state of Iowa, the good/excellent rating for the corn crop fell 3 percentage points on the week to 72%, down from 81% a year earlier.

The portion of the Iowa soybean crop rated good/excellent also fell 3 percentage points on the week to 66%, compared with 78% a year earlier. Some 10% of the Iowa soybean crop is now rated poor/very poor.

The Iowa office of the National Agricultural Statistic Service reported that heavy weekend rains across the state caused more flooding and ponding in wet areas.

Surplus rains are leading to widely varying crop conditions across Iowa. "Some fields have areas completely drowned out by standing water and sections turning yellow with stunted growth; meanwhile portions on high ground which drain well are thriving," NASS said.

The biggest deterioration in crop conditions came in the Delta/Southeast where hot, dry weather took a toll on crops.

In Arkansas, soybean conditions deteriorated to 50% good/excellent from 61% a week earlier due to moisture stress, while the North Carolina corn crop rating plummeted to only 40% good/excellent from 63% a week earlier.

Editor’s note: Richard Brock, Corn & Soybean Digest's marketing editor, is president of Brock Associates, a farm market advisory firm, and publisher of The Brock Report.