Abstract
An investigation has been organized To study the effect of the sprinkler irrigation system design on irrigation uniformity and its impact on barley crop yield and crop water productivity (CWP). The spring irrigation operating pressures (P) were 200 kPa (P1), 250 kPa (P2) and 300 kPa (P3). The sprinkler riser heights were 100 cm (H1), 125 cm (H2) and 150 cm (H3) from the ground. The results demonstrated that the maximum values of coefficient of uniformity (CU) and distribution uniformity (DU) (91.37 % and 0.85, respectively) were obtained at P3H3, while the minimum values (78.21 % and 0.71, respectively) were obtained at P1H1.Under P3H3 treatment, the highest values of 5.50 t ha-1 and 63.49 cm of grain yield (GY) and barely plant height (PH), respectively were recorded. The highest CWP value (0.75 kg m-3) was obtained when the P3H3 treatment was applied, while the lowest yield (0.36 kg m-3) was recorded under P1H1 treatment. According to the results of this experiment, under Sebha environmental conditions and similar regions, it is recommended to operate the solid set sprinkler irrigation system at P3H3 to obtain the highest CU and DU and consequently the highest GY, PH and CWP.
Highlights
Barley is one of the most important cereal crops grown in many developing countries, where it is often subject to extreme drought stress that significantly affects production (Ceccarelli et al, 2007)
Effect of operating pressure on sprinkler irrigation uniformity Table (2) shows the values of coefficient of uniformity (CU), distribution uniformity (DU) and coefficient of variation (CV) resulted from testing different operating pressures and riser heights
As shown in Table (2), the CU and DU were increased with increasing operating pressure (P)
Summary
Barley is one of the most important cereal crops grown in many developing countries, where it is often subject to extreme drought stress that significantly affects production (Ceccarelli et al, 2007). Barley in Libya, it is the second most important cereal crop following wheat (Al-Idrissi et al, 1996). Due to the general decreasing tendency of water availability for agriculture and the increase in energy costs, it becomes even more important to efficiently use water and energy in agriculture (Lopez-Mata et al, 2010). The water utilization efficiency (WUE) or so called crop water productivity (CWP) is very much related to the irrigation methods. Sprinkler irrigation is becoming a preferred method when the available water for irrigation becomes scarce (Uddin et al, 2013)
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