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1 RESUMO Este trabalho teve por objetivo estudar a variacao de vazao em tubogotejadores NaanPC laranja e NaanPC azul em funcao de precipitados quimicos, ao longo do tempo de funcionamento, quando submetidos a uma agua rica em ferro, avaliando-se especificamente o coeficiente de uniformidade de Christiansen (CUC) e o coeficiente de uniformidade de distribuicao (CUD). O experimento foi desenvolvido em uma bancada de ensaios para tubogotejadores no Laboratorio de Ensaio de Equipamentos para Irrigacao do Departamento de Engenharia Rural da Faculdade de Ciencias Agronomicas - UNESP, localizado no municipio de Botucatu – SP. O experimento foi montado em esquema fatorial 2x2x7, sendo duas doses de Fe, dois modelos de gotejadores e sete tempos de funcionamento, com tres repeticoes, totalizando 84 parcelas experimentais. Efetuou-se a analise de variância pelo teste F. As medias das vazoes dos gotejadores foram comparadas pelo teste de T de Student a 5% de probabilidade. Os resultados obtidos nao apontaram diferenca significativa nas diferentes doses de ferro. Entretanto, os resultados apontaram diferenca significativa na interacao gotejador x tempo e coeficiente de uniformidade de Christiansen (CUC). UNITERMOS: coeficiente de uniformidade de Christiansen(CUC), coeficiente de uniformidade de distribuicao (CUD), entupimento de emissores. BRAUER, R.L; CRUZ, R. L; VILLAS BOAS, R. L.; PLETSCH, T. A. EVALUATION OFWATER APPLICATION UNIFORMITY IN DRIPPERSIN FUNCTION OF IRON CONTENT 2 ABSTRACT This work aimed to study the occurrence of chemical precipitates effects in two types of drip hose (NaanPC orange and blue) due to chemical precipitation along the operating time, when subjected to water rich in iron, specifically evaluating the Christiansen uniformity coefficient (CUC) and distribution uniformity (DU). The experiment was conducted in a test bench for drip hose at Laboratory Test Equipment for Irrigation - Department of Agricultural Engineering, Sao Paulo State University. The experiment was a 2 x 2 x 7 factorial design, with two Fe doses, two drip brands, and seven operational times with three replicates, totalizing 84 experimental plots. The variance analysis was performed by F test. Average e mitter discharges were compared by Student t test at 5% probability. The results showed no significant difference in iron doses. However, the results indicated significant differences in drip versus operational time and the Christiansen uniformity coefficient (CUC). KEYWORDS: Uniformity coefficient of Christiansen (CUC), distribution uniformity (DU), emitter clogging.

AVALIAÇÃO DA UNIFORMIDADE DE APLICAÇÃO DE ÁGUA EM GOTEJADORES EM FUNÇÃO DO TEOR DE FERRO