Verificação do desempenho de gotejadores autocompensantes utilizando ácido húmico e água de abastecimento

Abstract

In this work the performance of two self-compensating drippers, Amnondrip PC and A5 PC using humic acid and water supply were evaluated. The experiment was carried out at the Federal University of Uberlândia, Uberlândia, MG, Brazil. The experiment was carried out in a specific laboratory at the Irrigation and Drainage Testing Laboratory of the Department of Rural Engineering of the Universidade Estadual Paulista "UNESP", Botucatu - SP. The drippers were evaluated after a continuous use of 168 hours in a closed circuit at 10, 20, 30, 40 and 50 mca pressures, in 3 repetitions of 10 min each, the last two pressures being above the operating pressure of both models with the intention of simulating an intense and more realistic use of the drippers found in the field. The performance evaluation parameters were the coefficient of manufacturing variation (CVf), the Christiansen uniformity coefficient (CUC) and the uniformity of distribution (UD). With the results it can be verified that there is a decrease of performance between the uses of the dripper with water and with the acid, mainly for the model Amnondrip PC when considering the last pressures simulating an intense use. The A5 PC model showed to be more resistant to the use above the service pressure with the humic acid and also an excellent performance when within the pressures of 10 to 30 m.c.a.