Non-regulated emitters are widely used in drip irrigation systems due to their structural simplicity and low manufacturing cost, however, they are very sensitive to obstruction, even using a filter system. The pulsating pressure occurs when the pressure is continuously varied in cycles. A cycle is the time interval comprising a continuous increase of pressure to an upper limit value immediately followed by a continuous decrease of pressure until a limit value lower, which could prevent clogging of emitters. The objective of this research is to verify if pulsating pressure prevents the clogging of non-regulated drippers, compared to the use of constant pressure. A commercial model of dripper with labyrinth system will be used to evaluate three treatments: a) pulsating pressure irrigation with a cycle of one minute; b) pulsating pressure irrigation with a cycle of thirty seconds; c) irrigation with constant pressure. The tests will be carried out on a test bench and will follow the ISO 9261 standard. Each treatment will have 50 drippers (repetitions). To reproduce the field conditions, pool filter sand will be added in the irrigation water at the concentration of 500 mg.L-1 in two granulometric ranges (53 to 105 ¼m and 250 to 500 ¼m). The indicators of the drippers performance will be emitter flow (Lh-1), relative flow (QRx), Christiansen uniformity coefficient (CUC), distribution uniformity coefficient (CUD), emitter equation and manufacturing coefficient (CVf).
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