The repsent invention relates to an insert (20, 22, 24, 26) for a share for uprooting root crop, the insert having a first end (50) adapted to form a portion remote from a cutting edge (16) of the share, and a second end (52) comprising an insert edge extending along an insert edge axis (IEA) and adapted to form at least a portion of the cutting edge of the share, characterized in that the thickness of the insert, from the first end to the second end increases continuously and the second end has a thickness (T2) greater than a thickness (T1) of the first end. Further, the present invention relates to the replacement shares of root crop harvesting machines.
