Caracterização hidráulica de gotejadores em condição superficial e subsuperficial - DOI: 10.7127/rbai.v7n500196

The uniformity of water application along the lateral line is closely related to the variation of flow emitters in localized irrigation, so the present study aimed to evaluate disorders of flow in irrigation, on condition of subsurface and surface drip (flow ascending and descending). The experiment was conducted in a greenhouse installed in the experimental area IF Goiano Câmpus Rio Verde. 20 PVC containers with 0.1 m of diameter and 0.6 m in height were installed on a test bench. Each container had a dripper buried at 0.2 m depth to allow monitoring of subsurface flow conditions. Clay soil was used to fill the containers. The experimental design was completely randomized, using two models of drippers with 10 replications (drippers) on each sideline. The pressures used were 0.4, 0.6, 0.8, 1.0 and 1.2 bar (model 1) and pressures of 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 bar (model 2) for making curves. The average flow of the drippers decreased during the working in conditions of subsurface, while the behavior hydraulic was excellent in the conditions of surface. The dripper model 2 was more susceptible to disturbance flow than the model 1. The direction (ascending or descending) and service pressure have a direct influence on the uniformity of application, can be up to 8%, which occurs during system pressurization and pressure control.