Cooler than normal weather across much of Nebraska and dry conditions are hampering the development of the corn crop.
The U.S. Department of Agriculture says in Monday's weekly report that warmer temperatures are needed in many areas to advance crop maturity.
The condition of dry land corn is rated at 45 percent good or excellent, compared with the 59 percent average.
Irrigated corn conditions stand at 79 percent good or excellent, compared with75 percent average.
Corn pollination remains significantly behind schedule.
The USDA says 72 percent of soybeans are rated good or excellent, one percentage point better than the week before.