Analysis of Several Discharges – Durations- Drip Line Placements Under Mango Trees “Tommy Atkins” (Magnifera Indica L.) In Zabid Valley, Tihama- Yemen.

The wetted volume of root area is one of the most important parameters for irrigation efficiency in the drip irrigation. Three durations (short – moderate- long duration) were compared with supplied 40, 60 and 80 L respectively. Three discharges (8, 16, and 32 l/h) were used and four treatments were tested for each discharge: one dripper, two drippers, four drippers with a looping of 20 cm and 40 cm around the trunk. The case of discharge 8 L/h with irrigation duration (10 h) in the treatment four drippers with a looping 40 cm around the trunk was superior and given the best percentage of root wetted area, 100% of the effective root area, as well as, an average volumetric water content and a coefficient of uniformity were 26% and 87%, respectively. Also, the saved water was 65.5 % compared to surface irrigation.