Abstract
The research aimed to recover clogged emitters, in the field, due to physical, chemical or biological origin. Four irrigation systems (A, B, C and D) with clogging problems in the States of São Paulo and Minas Gerais were selected. The systems were evaluated in loco, and 33 m of tape were picked out to run laboratory tests. The experiments were performed at the University of São Paulo’s Irrigation Laboratory test bench. Mean flow (qm), flow variation coefficient (CV) and water uniformity of distribution (UD) were computed. The statistical analysis was a completely randomized design consisting of two treatments to recover the emitters flow rate (50 mg L-1 free chlorine and 100 mg L-1 free chlorine); it was used F test for variance analysis, and Tukey test at 5% probability to compare treatment means. The pre-wash treatment with 150 kPa water pressure and opening the end of lateral line was effective to restore the coefficient of flow rate variation for the band excellent (CV < 5%) to the emitter used in the drip system “A”. There was no significant recovery of flow rate for any type of emitter after the use of chemical treatment of water.
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