Subsurface drip irrigation: an innovative solution
The subsurface drip (SDI Subsurface Drip Irrigation) is an innovative solution, powered by the latest generation of polyethylene tapes that can be buried to a depth of about 30 cm. These ducts are fitted with drippers (spaced from 40 to 50 cm, in general) with a flow rate which remains close to the nominal speed, and with good uniformity, when operating in the variation of pressure range (0.5- 2.5 bar) recommended by the manufacturer.
The innovative nature of this equipment is that it opposes the invasion of the drippers by particles of soil and roots. In addition, the emitters are provided with an anti-siphon system and the tape empties automatically as soon as the water is cut. These features differentiate them from the systems tested more than twenty years ago, such as porous pipes. Finally, according to the manufacturers, the lifetime of SDI would be about twenty years. In the event that this period may be actually reached SDI surpasses largely, from an economic point of view, wheel line system. The investment for buried drip equipment ranges from € 2,500 to € 4,000 per hectare.