A crop processing roll is disclosed for use in a forage harvester to process crop material comminuted by the operation of the forage harvester (10) before being discharged from the forage harvester. The processing roll (22) comprises an elongate cylindrical body of which the cylindrical outer surface is formed with a set of first grooves (23) extending generally lengthways of the cylindrical body, ridges (24) being defined between the first grooves (23). A set of second grooves (32, 35) is formed in the cylindrical outer surface which extend generally circumferentially (32) or helically (35) so as to intersect the first grooves (23) and pass through said ridges (24), thereby breaking said ridges into discrete teeth. The teeth defined by the intersecting first and second grooves are configured to ensure that crop material engaged by said processing roll does not migrate towards either axial one end of the processing roll.
