Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Design and Evaluation of A Low-cost Drip Irrigation System for Smallholder Farmers

Auteur : Yousif Hamed Dldom, Gomaa,

Université de soutenance : University of Gezira

Grade : Master of Science (MS) in Water Management 2021

Résumé
Drip irrigation is an important irrigation method that saves water and fertilizer by allowing water to infiltrate slowly into the roots zone which causes the high water use efficiency (more than 90%). The objective of this study was to design and evaluate the hydraulic performance and water use efficiency for a low-cost drip irrigation system for smallholder farmers using okra as an indicator crop. A low-cost drip irrigation system was installed in an open field at the Department of Agricultural Engineering, Faculty of Agricultural Sciences, University of Gezira during the winter season 2020-2021.The treatments were laid out in a Randomized Complete Block Design (RCBD) with three replications. The treatments consist of three variable operational heads H1, H2 and H3 (1m, 1.5m and 2m, respectively) and two lateral length lines L1 and L2 (5m and 10m, respectively).The data collection were hydraulic discharge, The percentage emitters clogging (Pclog%) and Okra yield component. The hydraulic performance results indicated that there were no significant differences between the treatments in flow variation (Qvar), coefficient of variation (CV), uniformity coefficient (Cu), distribution uniformity (DU) and statistical uniformity (Us). The highest distribution uniformity was 93.7% in H3L1, while the lowest was 89.6% in H3 L2. Higher uniformity coefficient was 96.2% obtained by H3L1 and the lower was 93.8% by H1L1. The statistical uniformity and flow variation scored the highest values by H3L1 and H1L1 (95.3%, 0.2%, respectively), while the lowest were obtained by H1L1 and H3L1 (92.3%, 0.12%, respectively). The percentage emitters clogging (Pclog%) were found to be 5% by H3L2 and 0.0% by H1L1. The highest coefficient of variation was 0.07% by H1L1, while the lowest was 0.04% obtained by H3L1. Results also showed there were significant differences in okra yield and water productivity (WP), the highest yield was obtained by H3L2 (11840 kg/ha) and the highest water productivity was obtained by H3L2 (9.9 kg/m3). To achieve more water productivity in low-cost drip irrigation system 2m operational head (H3) with 10m lateral length line (L2) can be used. Further studies in the effect of other lateral length lines of low-cost drip irrigation on hydraulic performance and water productivity are recommended.

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