The planting unit has a unit for opening a furrow in ground in a form of two adjacent disks (40, 41). A pointed member is mounted on a frame (1) and protruded between the disks in a direction of the ground, where the member forms the furrow in V-shape. A retaining unit (6) retains a member mounted mobile on the frame between a retaining position of the member and a releasing position. An actuating unit is connected with the retaining unit. The pointed member includes an upper portion connected to a male/female connection unit with a complementary shaped unit integrated with the frame.
