DTN Closing Grain Comments 03/05 14:04 Grains Shake Off Thursday's Selling, Finish Higher May contracts of corn, soybeans and all three U.S. wheats closed higher Friday, shaking loose from Thursday's late round of selling with signs of strong, underlying demand. Once again, soybean oil was among the stronger performers, but it was May oats that showed the highest percentage gain among Friday's grains, closing up 13 1/2 cents.