Disturbances in flow drippers due to water use with presence of iron

This research sought to quantify the possible flow rate variation in 20 dripper models. The experiments were carried out at the test Bench at the Laboratory of Irrigation at the University of São Paulo. The treatments used in this experiment were the following: a) application of 20 mg L-1 of total iron with potable water; b) application of 20 mg L-1 of total iron with clay soil and water with high organic concentration (algae) during 12 hours and leaving this combination within the tape for 36 hours. The experimental design was outlined factorial, and the "F" test was used in order to analyze variance and Tukey (at 5% of significance) to compare averages and regression analysis. Water was collected from the line for five minutes from ten emitters using the gravimetric method. After that, the mean flow (qm), flow variation coefficient (CV) and water uniformity of distribution (UD) were computed. Model 13 was the one which suffered the most flow disturbs and this variation occurred in less time for the treatment of 20 mg L-1 of total iron with clay soil and water with high organic concentration (algae).