1Department of Soil Sciences and Water Resources, College of Agriculture, University of Anbar, Ramadi, Anbar, Iraq.
*Corresponding Author: Huthaifa Jaseem Mohammed, Department of Soil Sciences and Water Resources, College of Agriculture, University of Anbar, Ramadi, Anbar, Iraq. Email: ag.huthaifa.jaseem@uoanbar.edu.iq
Water scarcity and climatic challenges in Iraq necessitate the adoption of efficient irrigation systems such as drip and subsurface drip irrigation to improve water use efficiency and reduce soil degradation. This study evaluates the effectiveness of the subsurface nano-drip irrigation system.
A field experiment was conducted in 2025, which included measuring the uniformity of the emission and calculating the coefficient uniformity values, in addition to the percentage of variation in the drip discharge before planting under three levels of operating pressures 50, 100 and 150 kPa. A discharge rate of 2.26 L h-1 was adopted at 150 kPa.
The operating pressure of 150 kPa gave moral values for the distribution homogeneity coefficient, emission uniformity and discharge variance ratio, reaching 98.13%, 96.57% and 6.44% respectively, with an actual dripper discharge of 2.26 L h-1. At the end of the growing season, the operating pressure of 150 kPa resulted in a discharge rate of 2.19 L h-1, while the values of distribution uniformity (DU), emission uniformity (EU) and coefficient of variation (CV) were 97.83%, 96.39% and 9.74%, respectively. Operating at 150 kPa provides optimal discharge characteristics, with minimal degradation observed after seasonal operation. These findings confirm the suitability of nano-drippers for subsurface irrigation applications, supporting their efficiency and sustainability in agricultural water management.
Coefficient of variation in discharge, Drip irrigation, Emission uniformity, Operating pressures, Uniformity coefficient
