Unit for irrigation system using spraying

System which consists of a water-dispersion tube 13, from which descends, in the vicinity of one of the ends, a vertical telescopic tube 11 for coupling to the irrigation nozzles, all this being supported by a structure provided with drive wheels 1 at the ends capable of moving the assembly automatically in a movement guided by the sliding of feelers (feeler gauges) 7 on an orientation cable 8, whilst, in the zone transversely coincident with the vertical tube 11 there are two wheels 2, perpendicular to the movement wheels, which are movable vertically, with the possibility of being suspended without bearing on the ground for movement or of being supported, at this end raising the structural assembly with a view to the mobility of the assembly rotationally about the vertical tube 11 in the irrigation operation.