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Studies on irrigation have been undertaken to rationalize the use of water in agriculture. Clogging of drip emitters is one of the most common problems in irrigation. Phosphoric acid was employed as a cleaning agent of drips with red potassium chloride used for fertirrigation. Current assay employed a chemical irrigation system for gravity drips with entrance pressure at low variation, in four experimental treatments: irrigation prior to the use of the chemical irrigation system (T1); fertirrigation with red potassium chloride (T2); chemical irrigation system with phosphoric acid (T3); irrigation posterior to chemical irrigation system (4), with six replications, and 1 h as mean time per replication. Treatments with fertirrigation solutions in a concentration of KCl with 60% potassium were de-obstructed with phosphoric acid at a concentration of 7.086 g L-1. Procedure was analyzed by uniformity coefficients, statistical control graphs and contour maps. Residues from de-obstruction caused a mean 15.13% clogging within drip rows. Results showed that phosphoric acid may be employed as a cleaning agent in drip tubes, although adequate management of the system should be undertaken.

DESOBSTRUÇÃO DE EMISSORES COM ÁCIDO FOSFÓRICO EM FERTIRRIGAÇÃO COM CLORETO DE POTÁSSIO VERMELHO