WASHINGTON — Silking in the 18 main corn-growing states advanced to 16% as of July 14, up from 10% the previous week, but still lagged significantly behind the five-year average of 35%, the U.S. Department of Agriculture said in its most recent Crop Progress report.

The condition of the crop declined modestly to 66% good to excellent, down from 68% in the previous week. The percentage of the crop in very poor to poor condition moved up to 9% as of July 14, up from 8% the previous week, the U.S.D.A. said.

A total of 26% of the soybean crop was blooming in the latest week, up from 10% the previous week but down significantly from the 40% five-year average for the same date, the U.S.D.A. said.

The soybean crop in the 18 main soybean-growing states was rated 65% good to excellent, down from 67% good to excellent the previous week. A total of 8% of the crop was in poor to very poor condition, up from 7% the previous week, the U.S.D.A. said.

The winter wheat harvest in the 18 main winter wheat-growing states was 67% complete as of July 14, close to the five-year average of 71% harvested as of July 14, the U.S.D.A. said.

Spring wheat in the six main states was 71% headed as of July 14, up sharply from the previous week when 45% was headed and close to the five-year average of 73%, the U.S.D.A. reported. The condition of the crop deteriorated slightly as of July 14, with 70% rated good to excellent compared to 72% good to excellent in the previous week.

The U.S.D.A. said the oats crop in the nine main oats-growing states was 91% headed as of July 14, down modestly from the 93% five-year average for the date.