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(AP) - Corn fell to its lowest level in six weeks on concerns that a bumper crop could bloat supplies.
Farmers planted the most corn in 80 years this year, and favorable weather, compared to last year's drought, has boosted the chances of a good harvest.
Corn for delivery in December fell 4.5 cents, or 1 percent, to $4.49 a bushel. That's the lowest settlement price since Aug. 13.
"We are going to see a monster crop." said Sterling Smith, a commodities analyst at Citigroup.
Wheat and soybean prices edged higher.
December wheat gained 4.75 cents, or 0.7 percent, to $6.58 a bushel. Soybeans for November also rose by 4.75 cents, or 0.4 percent, to $13.13 a bushel.
In other commodities trading, most metals fell as traders worried about the outlook for demand from China and the strength of the U.S. economy.
Copper dropped the most. December copper fell 4.2 cents, or 1.3 percent, to $3.26 a pound.
Gold for delivery in the same month fell $10.70, or 0.8 percent, to $1,316.30 an ounce. Silver fell 27.10 cents, or 1.2 percent, to $21.59 an ounce. October platinum dropped $7.10, or 0.5 percent, an ounce to $1,418.80.
Only palladium bucked the trend and rose. Palladium for December delivery climbed $2.05, or 0.3 percent, to $720 an ounce.
In energy trading, the price of oil fell for the seventh time in eight days Tuesday, as the U.S. signaled a willingness to pursue a diplomatic path with Iran.
U.S. benchmark oil for November delivery fell 46 cents to finish at $103.13 a barrel, the lowest close since July 30.
In other energy markets wholesale gasoline rose 4 cents to $2.66 per gallon, natural gas lost 11 cents to $3.49 per 1,000 cubic feet. Heating oil was flat at $2.96 per gallon.
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