Investigation of Water Use Efficiency of Wheat and Barley in Arable Lands of Sistan Plain

Water productivity is a key factor for identifying the agricultural systems appropriate for arid and semi-arid regions. The objective of this study was to identify the effectiveness of wheat and barley`s water usage in Poshteab district of Sistan. This field research included 5 villages of Rahdar, Cherk, Hajiabad, Piran and Teymurabad sheykhi. To calculate the volume of irrigation in channels, the float method was used. Moreover, the depth of irrigation in farms were determined. A piece of land as the prominent sample was selected for harvesting which had 1m×1m dimensions. Two other powerful and weak samples were selected from two different lands in every village (in some cases the two samples were beside each other) and were harvested. When wheat samples were dried, the separation process was done manually. Every land`s seeds were weighted and their yield was evaluated. All in all, the average efficiency of water usage effectiveness of wheat and barley in Poshteab district of Sistan were 1.03 and 1.08 kg/m3, respectively. Additionally, the average efficiency of weak usage of Wheat and barley in Poshteab districs of Sistan were 0.72 and 0.64 kg/m3, respectively. Moreover, the functional chart of wheat and barley yield along with the depth of used water indicated that increasing the wheat and barley `s yielding, not only depended on water use, but also it depended on the irrigation management, calamities, fertilizers and soil, considering the same climates in the region.