The invention relates to an item of equipment (1) that basically comprises a rack (R), composed of piping (T), which comprises a manifold (3) that mixes water (A) and fertilizers (F) by means of an injection pump (BJ) that injects water (A) into the manifold (3), and electric diaphragm metering pumps (10) that suck the fertilizers into the manifold (3) for subsequent dispersion to an irrigation system (IR); the invention may be installed as a by-pass on a main irrigation line (LI) and be installed as a by-pass with the motorized irrigation pump (MI).
