Backpressure effects on emitters flow rate in subsurface drip irrigation

Subsurface drip irrigation success depends on surpassing the backpressure obstacle, a phenomenon which occurs when water application intensity exceeds infiltration rate of soil, reduces emitter flow rate. Thus, this study aimed to determine variation, in relation surface flow, four emitters buried at two depths loam soil (Yolo Loam soil), and generated by subsurface condition. The cavity radius developed around outlet was also obtained. experiment conducted completely randomized design, strip-plot scheme, with three treatments: installation depth driplines (two levels: 0.10 0.20 m); dripline type (four D5000, JardiLine, TalDrip Hydro PCND) time (three 0.5, 1.0 3.0 h). results showed that variation between Yolo inlet pressure 145 kPa, greater higher For pressure-compensating emitters, even under influence, not enough cancel device operation, emitters. depth, as well time, did affect and, consequently, variation.