A knife for cutting crop stalks and impacting the cut crop stalks to prevent damage to the tires of agricultural vehicles. Leading and trailing edges of the knife oppose one another and define a trailing face therebetween. The leading edge is higher than the trailing edge to cut stalks and the tailing edge is angled downward in trailing relationship to the leading edge so that as the knife cuts a crop stalk the trailing face also impacts the cut stalk to force it downward to the ground.
