Efeito do tempo de uso na uniformidade de distribuição de água em um sistema de irrigação por gotejamento.

Abstract

The objective of this study was to determine the water distribution uniformity a drip irrigation system as function of use time. The study was carried out in a two years operation drip irrigation system with 3,600 hours of use. The system is installed in the experimental fields of “Centro de Pesquisa Agropecuária do Meio-Norte” (CPAMNEMBRAPA), at Parnaíba, Piauí state, Brazil. The dripers were a Katif model, with flow rate of 3,75 L.h-1 and 200 kPa operation pressure. The water distribution uniformity was determine by Merriam & Keller adapted method. There was not statistical difference (P>0.05) among flow variation of drips, showing that the water distribution uniformity coefficient was not affected during the working time of the system.