A harrow attachment (400, 500) for a tillage implement, comprising: a harrow drawbar (300, 300') configured to be mountable to a frame member of a tillage implement; at least one harrow rank having a rank bar (410, 510) supporting a plurality of harrowing tools; a pivot link (450, 452, 540, 542) pivotally coupling the at least one harrow rank to the drawbar (300, 300') to allow the at least one harrow rank to trip by pivoting upward toward the drawbar (300, 300') from a home position in which the at least one harrow rank is farthest away from the drawbar (300, 300'); a downforce spring coupled to the drawbar (300, 300') and configured to be in a fixed length state when the at least one harrow rank is in the home position and in a variable length state when the at least one harrow rank is tripped, an adjustment mechanism with a plurality of adjustment locations (570A - 570C), characterized in that the adjustment mechanism includes an adjustment pin mountable to each of the plurality of adjustment locations (570A - 570C); wherein the adjustment mechanism coupling the downforce spring to one of the at least one harrow rank and the pivot link (450, 452, 540, 542) in one of the plurality of adjustment locations (570A - 570C) in each of which the at least one harrow rank is in the home position and the downforce spring is in the fixed length state; wherein a first end of the downforce spring is mounted to the adjustment pin, and wherein the downforce spring, when in the variable length state, applying a biasing force to the at least one harrow rank away from the drawbar (300, 300'), and, when in the fixed length state, the biasing force is removed. a harrow drawbar (300, 300') configured to be mountable to a frame member of a tillage implement; at least one harrow rank having a rank bar (410, 510) supporting a plurality of harrowing tools; a pivot link (450, 452, 540, 542) pivotally coupling the at least one harrow rank to the drawbar (300, 300') to allow the at least one harrow rank to trip by pivoting upward toward the drawbar (300, 300') from a home position in which the at least one harrow rank is farthest away from the drawbar (300, 300'); a downforce spring coupled to the drawbar (300, 300') and configured to be in a fixed length state when the at least one harrow rank is in the home position and in a variable length state when the at least one harrow rank is tripped, an adjustment mechanism with a plurality of adjustment locations (570A - 570C), characterized in that the adjustment mechanism includes an adjustment pin mountable to each of the plurality of adjustment locations (570A - 570C); wherein the adjustment mechanism coupling the downforce spring to one of the at least one harrow rank and the pivot link (450, 452, 540, 542) in one of the plurality of adjustment locations (570A - 570C) in each of which the at least one harrow rank is in the home position and the downforce spring is in the fixed length state; wherein a first end of the downforce spring is mounted to the adjustment pin, and wherein the downforce spring, when in the variable length state, applying a biasing force to the at least one harrow rank away from the drawbar (300, 300'), and, when in the fixed length state, the biasing force is removed.