DETERMINATION OF PERFORMANCE FACTORS OF DRIP IRRIGATION FOR DATE PALM (THE OASIS OF GAFSA: SOUTHERN TUNISIA)
The interest of this study is the evaluation of a drip irrigation of date palm in an oasis region and specifically Aguila in the Governorate of Gafsa (south Tunisia), through some performance indicators such as the efficiency and uniformity of application. The first part of this work has been devoted to the determination of different soil hydrodynamic characteristics namely size, bulk density, infiltration of law and the hydraulic conductivity at saturation. Also work on the root distribution was conducted. Three profiles were sampled, one is 0.5 m from the palm trunk, the second to a distance of 1 m from the trunk of the palm and the third at a distance of 2 m. In a second step, an evaluation of irrigation has been conducted (under drip, drip of 15 cm and 30 cm from dripper). Three irrigation durations were tested for the same tree with a flow rate of 30 L/h (the rate adopted by the farmer). It is 2, 3 and 5 hours. The measures focused on monitoring the water content before irrigation, immediately after irrigation, after 24 and 48 hours after the end of irrigation for the three periods. The analysis of root distribution as a function of depth (0 to 120 cm) indicates that the majority of roots are located in the portion of soil between 40 and 120 cm. A follow-up range wetting the soil surface HR for the three periods of irrigation has been done. This radius is: -42 cm for irrigation of 2 hours duration, 48 cm for the irrigation of 3 hours duration, 60 cm for irrigation duration of 5 hours. The uniformity coefficient on moisture in the root zone was 99, 76 and 87% respectively for the duration of irrigation 5, 3 and 2 hours.
Dhawadi, L. and Daghari, H. (2010). DETERMINATION OF PERFORMANCE FACTORS OF DRIP IRRIGATION FOR DATE PALM (THE OASIS OF GAFSA: SOUTHERN TUNISIA). Acta Hortic. 882, 845-853
hydraulic conductivity, efficiency, uniformity coefficient, wets front, roots