A distributor device of fertilizer substances for a seeder machine includes a storing tank of a fertilizer substance, a plurality of distribution conduits connected to the storing tank, at least one source of high-velocity air connected to the distribution conduits for distributing, in use, the fertilizer substance. The device also includes: at least a connecting element, having at least two infeeds and at least one outfeed, the connecting element being connected to at least two of the distribution conduits so as to convey, in use, the fertilizer substance coming from at least the two distribution conduits to the outfeed.