Abstract: A tagging attachment for a hay baler for automatically inserting an identification tag into a hay bale at a specified preselected location, includes a guide support member extending into the bale chamber for supporting a tag in a position in the chamber for being torn from a roll or strip of tags as the bale is being formed. The hay passing across the support engages and tears the tag from the tag strip. Tags are selectively and intermittently advanced in response to a predetermined timing during the formation of the bale for precise location of the tag within the bale.