Effect of Irrigation Water on Water Productivity and Yield of Winter Wheat under Surface and Subsurface Drip Irrigation

Today, the use of subsurface drip irrigation systems for row crops such as wheat is increasing due to its higher productivity than other irrigation methods. The purpose of this study was to investigate the effect of irrigation water depth and displacement depths of subsurface drip irrigation lateral on winter wheat yield and water use efficiency in Sanandaj city. For this purpose, wheat crop (Pishgam cultivar) was cultivated in the fall of 2017 and an experiment was implemented in the form of split plot design based on a completely randomized block design in Sanandaj County. The main and sub plots of the present study included four levels of irrigation water (60, 80, 100, 120% of water requirement) and four lateral irrigation displacement depths (30, 40, and 50 cm) in three replications, respectively. The results showed that, the subsurface drip irrigation system had higher water productivity compared to the surface drip irrigation system. The results also showed that highest irrigation water use efficiency in treatment with lateral displacement depth of 40 cm and irrigation water depth equal 80% water requirement obtained.