Volume 12, Issue 4 (3-2022)                   2022, 12(4): 93-107 | Back to browse issues page

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Yield and Water Productivity of Wheat for Two Planting Dates Under Supply-Oriented Water Management in The East of Isfahan
M. Khosravi Fard , M. Gheysari , M. Shayannejad
Department of Irrigation, College of Agriculture, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Abstract:   (981 Views)
Regarding the scarcity of water resources in Iran, management of planting dates and irrigation is necessary for wheat production. The goal of this study was to determine the effect of two planting dates of November (PD1) and February (PD2) and two irrigation regimes: traditional (T) and supplementary (W) on wheat yield and irrigation water productivity in the east of Isfahan. Field experiments were carried out during two consecutive seasons’ autumn and winter in the crop year of 2016-2017 in a clay loam soil. The results showed that planting date significantly affected wheat yield and water productivity (P < 0.01). Yield in PD1 was 11.5% higher than PD2, while water productivity in PD1 was 9.0% lower than PD2. Supplementary irrigation in clustering period had a significant effect on wheat grain yield. Comparison of crop evapotranspiration (ETc) calculated by FAO-Penman-Monteith method with that of applied irrigation water showed that the later in TPD1 and TPD2 treatments were, respectively, 40.0 and 19.9% more than the ETc. In traditional irrigation management (T), lack of coordinations between the supplied water and the timely water requirement based on ETc led to high water losses due to deep percolation and runoff. Supplementary irrigation regime on both planting dates significantly increased yield, with no positive effect on water productivity. We concluded that due to supply-oriented water management in the east of Isfahan, farmers use irrigation water more than what is needed for wheat yield production leading to less yield and much low water productivity than the potentials realizable in the region.
Keywords: Irrigation water use efficiency, Optimal planting date, Pishtaz wheat cultivar, Surface irrigation.
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Type of Study: Research | Subject: Plant water relations
Received: 2021/09/8 | Accepted: 2022/03/1 | Published: 2022/03/1
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