U.S. grain futures ended lower Friday on broad commodity weakness, as traders were averse to risk amid economic uncertainty in Europe.

The declines were driven by a widespread risk-off trade in commodity markets, with declines witnessed across energy and grain futures. The U.S. dollar's surge against the euro weighed on grains in general, with traders continuing to take profits after recent gains, helping to extend the losses.

"The markets will continue to struggle without new, consistent demand news to attract buyers," said Chad Henderson, analyst with Prime Ag Consultants in Brookfield, Wis.

Bullish traders need to be fed supportive news. Buyers weren't inspired by Thursday's world supply estimates from the U.S. government--which lacked any supportive surprises--routine demand, and easing crop weather concerns, said Henderson.

Concerns over the Greek debt crisis weighed on most markets throughout the day, a feature buoying the U.S. dollar and shaking investor confidence ahead of the weekend.

"People were happy to shed some risk going into the weekend, taking a cautious approach in the absence of any concrete news on progress in the Greece debt crisis saga," said Jack Scoville, analyst with Price Futures Group in Chicago.

The wheat market fell to its lowest level in 2 1/2 weeks, garnering additional pressure from record world wheat inventories. "Wheat has a tough road to follow if prices are to climb after U.S. Department of Agriculture on Thursday reported the world will have record stockpiles of wheat this year," Scoville said.

The wheat market had rallied recently on concerns about wheat production losses due to severe cold in Europe and the Black Sea region.

CBOT March wheat ended down 16 cents, or 2.5%, at $6.30 per bushel. March KCBT wheat ended down 19 cents, or 2.7%, at $6.73, and March MGEX wheat dropped 17 1/2 cents to $8.14 1/4.

Corn stumbled with wheat, but new export sales to Egypt allowed the market to withstand some of the day's selling pressure. However, the sales are not expected to change the trend in the market, particularly with technical traders viewing the declines as a disappointing finish to the week, Henderson said.

CBOT March corn ended 5 1/4 cents lower at $6.31 3/4 a bushel.

Soybean futures ended modestly higher, recovering from early widespread selling, as traders took profits on short positions ahead of the weekend. Soybean futures had settled lower in the three previous trading days.

CBOT March soybeans ended 1 1/2 cents higher at $12.29 a bushel.

-By Andrew Johnson Jr., Dow Jones Newswires; 312-347-4604 begin_of_the_skype_highlighting 312-347-4604 end_of_the_skype_highlighting; Andrew.johnsonjr@dowjones.com