1. Installation for hydroponic irrigation, which being constituted from a support structure of a plurality of sheets arranged between stringers to form "V" channels, through which water circulates with nutrients for plant cultivation, is characterized by the structure support of the sheet channels for plant cultivation, is constituted from a frame formed by four plates corresponding to two stringers and two crossbars, which at their ends fit by sliding in openings or channels established for that purpose in respective lateral faces, in correspondence with the upper part of these, of struts in function of legs of the frame that form the stringers and crossbars, complementing with a storage tank of the water with nutrients, with a motor pump and a conduit for water impulsion towards the exits established in one end of the culture channels, established on a grill supported between the two t ravesaños corresponding to the plates that form the upper rectangular frame. 2. Installation for hydroponic irrigation, according to claim 1, characterized in that the grill on which the stringers that form the support for the plates corresponding to the "V" channels are arranged, is supported by its ends in profiles provided for the purpose in the internal face and in correspondence with the upper part of the crossbars corresponding to the respective plates of the upper frame, with such an arrangement in which the "V" channel grill is slightly inclined towards the end under which the tank is located of storage of water and nutrients, to recycle irrigation water through holes provided for this purpose at the lower end of the channels corresponding to the growing grid. 3. Installation for hydroponic irrigation, according to previous claims, characterized in that the struts or legs are of rectangular prismatic configuration, and on two of their faces they have the sliding groove and pressure of the ends of the stringers and crossbars of the upper frame. . 4. Installation for hydroponi