Chicago agricultural commodity futures traded mixed Tuesday, with wheat and soybeans prices down and corn price up on positive export data.

The most active corn contract for March delivery rose 1 cent, or 0.24 percent, to settle at 4.25 dollars per bushel. March wheat lost 1.25 cents, or 0.22 percent, to settle at 5.6225 dollars per bushel. March soybeans fell 36 cents, or 2.73 percent, to close at 12.805 dollars per bushel.

One of the big fears for soybeans market, that Chinese buyers of US soybeans have begun canceling orders and switching to South American supplies, is beginning to materialize. At least, that is the market talk. The selling was compounded by reports that the early Brazilian harvest is going well.

According to weather forecast, Argentina, the world's third largest exporter of corn and soybeans, received a better-than- expected coverage over the long weekend with lower temperatures and more rain on the way.

Corn escaped the selling despite the fact that Argentine rains would appear to bode well for corn production. US weekly corn exports improved at 29.8 million bushels last week, from 20.9 million bushels the week before.

For wheat, the weekly US exports were at 15.6 million bushels, down 10.0 million bushels week on week. Australian wheat emerged as the cheapest offered to an Iraqi tender, undercutting supplies from the US