Wet bulb dimensions in drip irrigation system

Abstract

The study on wet bulb is recommended as part of the water management and dimensioning in localized irrigation system. The research had the objective to evaluate the formation of wet bulb in a medium-textured soil under superficial drip irrigation, in the initial condition of dry soil. To this end, we used a drip irrigation system, TalDrip model, with nominal diameter of 17 mm, maximum working pressure of 9 mwc, with indicated flow rate of 1.7 L h ^-1, drippers spaced by 30 cm, supplied by a water tank. To control the pressure, 2 glycerin manometers and a ½ hp pump were used. The experiment was conducted in a split-plot design, in which the plot consisted of four operating pressures (2, 4, 6 and 8 mwc) and the subplots, of four irrigation times (0.5; 1; 1.5 and 2 hours). A randomized block design (RBD) was used, with four replicates. The analyzed variables were superficial diameter, maximum diameter, maximum depth and flow rate, in the trench method. The time of application and the operating pressure have effect on the mean flow rate, mean diameter and superficial diameter.