Modeling on Water Dynamics of Irrigated Winter Wheat and WUE under Limited Water Supply

Zhou Qingyun, Zhang Baozhong, Han Nana

Ekoloji, 2018, Issue 104, Pages: 1-8, Article No: e104001


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Irrigation improves grain yield, but excessive irrigation might not increase yield at all. Field experiments and simulations on water dynamics of winter wheat, as influenced by a distinct water supply in Tianjin region, were investigated. Hydrus-1D was applied to simulate soil water dynamics of winter wheat under different irrigation regime. The results showed that Hydrus-1D performed well in simulating soil water dynamics under flood irrigation with a different water supply considering crop growth and groundwater table variation. Root-mean-square error values were within 0.008–0.03384cm3cm-3, compared with experimental results. Evapotranspiration was the highest under high irrigation amount with four irrigations, as well as downward drainage. However, grain yield was not the highest under this condition, and water use efficiency (WUE) was relatively low due to insufficient water irrigation supply. Water stress was the highest under no irrigation condition due to water scarcity. The maximum value of WUE occurred with low irrigation amount with two irrigations as a result of low leaf area index and water stress. Therefore, applying two irrigations in winter wheat during growing season is an efficient irrigation regime for the Tianjin region of North China.


winter wheat, Hydrus-1D, water stress, water use efficiency


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