Montazar, Aliasghar ， Azadegan, Behzad
2012-02-01 IRRIGATION AND DRAINAGE 2012 61(卷), 1(期), (52-59页)
A field experiment was conducted for three growing seasons to study the effects of seasonal water use and applied N fertilizer on grain yield and water productivity indices of wheat in an arid region. The results revealed that the yield response to N was associated with water application levels. The water productivity indices were influenced by irrigation strategies, and deficit irrigation effectively boosted productivity of irrigation water (WPI). The highest WPI was obtained at a seasonal irrigation water of 156?mm for different levels of applied nitrogen. For levels of applications 70% of the required nitrogen, required nitrogen, and 120% of the required nitrogen, WPI ranged between 0.93 and 2.28, 1.30 and 2.75, and 0.98 and 2.47?kg m-3, respectively. The data generated here indicate that maximum water productivity (WPE) would be achieved when 98kg N ha(-1) is combined with 156 mm of supplemental irrigation (2.72 kg m(-3)). Consequently, when limited irrigation water is combined with N fertilizer appropriate management, water productivity can be substantially and consistently increased in arid regions. Copyright (C) 2011 John Wiley & Sons, Ltd.