Abstract: A disk for the dosage and individual selection of seeds, having a determinate axial thickness delimited by two facing circular walls or surfaces, and comprising housing seatings made along the peripheral edge of one or both circular walls or surfaces and passage ways that open from the housing seatings toward the outside of the disk, for the passage of a stream of air. The passage ways are made on the axial thickness, in a radial direction with respect to the center of the disk.

Abstract: Plowshare particularly for seeding and eventual manuring in soil in a continuous line of the type involving two equal and symmetrical opposite convergent wings with an apex having a substantial “V” shaped plan (31). Their ends are turned upwards (32) so that the plowshare may be pulled so as to penetrate at a certain depth into the soil; cut the soil at the depth and make it slide above the wings (31). The flaps (32) force the soil to pour back in the obtained furrow covering it, applying at least one seed distribution device in the free area of the “V” shaped inside apex being possible.