A seeder (1) comprising a supporting structure (2) detachably associable with a lifting device formed at the rear region of an agricultural tractor, the supporting structure (2) supporting an apparatus for the distribution of seeds (4) the supporting structure (2) supports a frame (5) for supporting at least one presser roller (6) that can rotate with respect to the supporting frame (5) about a rotation axis (100) and is arranged, during use, in the rear region with respect to the apparatus for the distribution of seeds (4), at least one device (10) for moving the supporting frame (5) with respect to the supporting structure (2) being provided in order to adjust the pressure of the presser roller (6) on the ground.
