Desempenho de um sistema de irrigação por gotejamento para a cultura do feijão-cupi.

Abstract

Water use, land topography, water quality influence the uniformity of a drip irrigation system. Due to the degree of clogging in the drippers and efficiency of the system. Therefore, the evaluation of the irrigation system through the uniformity coefficients are of relevance to determine the uniformity of water distribution. The localized irrigation method, with drip system, consisted of a main line. The lateral lines consisted of drip tapes with emitters spaced every 0.1 m and flow of 1.05 L h-1 when operating at a flow rate of 0.5 bar. Thus, the objective of this study was to evaluate the performance of the drip irrigation system for cowpea-cowpea crop grown under evapotranspiration water replacement levels, with a randomized block design with four levels of replacement of water lost by evapotranspiration of the crop (25, 50, 75, 100% of ETc) and four repetitions (blocks). The results showed that the degree of clogging (SG) ranged from 10.87 with the replacement of 75% of the ETc to 21.19 with the replacement of 25% of the ETc, evidencing that the EG is classified as average between 10 and 40% for the degree of clogging of the emitters.