The plant comprises: - a mobile irrigator (A) for sprinkle-irrigating large/medium size pieces of terrain, connected to a supply tube (B) of the irrigating water, - a tube-winder drum (D), about which the supply tube (B) winds, connected to a source of pressurised irrigating water, -a hydraulic turbine (M) actuated by the irrigating water, able to supply energy for rotation of the drum (D), -a geared mechanical system (10) of transmission of the motion, interposed between the turbine (M) and the drum (D), able to supply the drum (D) with a lower rotation velocity with respect to the velocity generated by the turbine, for winding the tube (B), the mechanical transmission system (10) comprises a gear-change group (20) able to provide in outlet two different rotation differences..
