The invention relates to an underground plant irrigation system using nozzles with protective tubes. According to the invention, the irrigation system consists of a distribution pipe (1) made of rigid plastics, having some orifices (2) with some calibrated nozzles (3), with a protective tube (4) preventing the clogging with soil of the nozzles (3) and pipe (1) through which the crop field is supplied with water and liquid fertilizers, by its two ends.
