Chicago Board of Trade (CBOT) grains futures closed mixed with wheat and corn futures firmed on Wednesday, supported by bargain buyers stepping into the market following declines to multi-week lows on Tuesday.

Wheat notched the biggest gain, with the most-active Chicago Board of Trade soft red winter wheat contract rising nearly one percent after bottoming out at its lowest since Feb. 8.

Wheat received additional support from signs that the recent market weakness has made prices for U.S. supplies more competitive on the export market.

The most active corn contract for May delivery rose 1.25 cent, or 0.35 percent, to 3.635 dollars per bushel. May wheat delivery rose 5.5 cent, or 1.28 percent, to 4.36 dollars per bushel. May soybeans dropped 1.25 cents, or 0.13 percent, to 9.98 dollars per bushel.

Excluding shipping costs, U.S. soft white wheat was the cheapest wheat offered in an Egyptian government tender for supplies.

A weakening dollar, which also helps boosts export demand of U.S. wheat, added more strength.

U.S. corn created some interest on the global market despite big crop expectations for Argentina and South America as a whole.