Abstract: A device for injection of liquid fertilizer into an irrigation pipe includes an axisymmetrical housing (I) adapted for insertion into the pipe line (III). The device comprises an axial turbine impeller (II) rotatably positioned in the housing, the impeller including several vanes (20) surrounded by a shroud (22) and a flat, annular rim (6) outstanding from the shroud and closely surrounded by the housing walls. The rim contains, on one or on both of its flat sides, a side-channel pump of known design which includes a plurality of radial vanes (30) inserted into an annular portion of the flat side and a channel (33) recessed in the adjoining housing wall portion cooperating with the annular vane portion and extending from an inlet end (34) to an outlet end (35), the two ends being separated by a non-recessed wall portion (36).