Grain prices were mixed but mostly higher on Wednesday due to export optimism and concerns over South American production potential. Corn prices shifted 0.5% higher, supported by worries over Ukraine's export capacity, while soybean prices climbed more than 1.25% higher. Wheat prices, however, failed to find additional forward momentum after technical selling and profit-taking. The U.S. Dollar firmed slightly, and energy prices surged due to reports of a major Russian pipeline closure. Argentina and Brazil are expected to be major exporters of grain, and Egypt is negotiating wheat sales sourced from India.