| To evaluate the effect of irrigation regimes on wheat grain yield and water use efficiency (WUE) in Huang-Huai Plain, experiments were carried out during 2011-2014 wheat growing seasons under cement pool condition in Zhengzhou, Henan province. The experiment was in a randomized block design with four repetitions of four irrigation regimes, i.e. irrigation at jointing (W1), irrigation at jointing and booting (W2) and irrigation at jointing, booting and grain-filling (W3), and the treatment of no irrigation (W0) was taken as the control. Compared to W0, W1, W2 and W3 increased wheat grain yield by 37.2%, 52.9% and 52.7% averaged across the three growing seasons, respectively, and increased the soil water consumption (SWC) by 27.1 mm, 70.4 mm and 94.9 mm, respectively. Irrigation had relative higher yield improvement in drier growing seasons than that in normal precipitation seasons. Both WUE and grain yield had a quadratic relationship with SWC, in which the treatment of W1 obtained the largest value of WUE, and the W2 got the largest grain yield. Taking both grain yield and WUE into consider, twice irrigation (W2) in the area can reduce the risk of yield loss in drier growing seasons, while single irrigation at jointing (W1) was effective and economical in normal precipitation seasons. |
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