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| DOI：10.13522/j.cnki.ggps.20190062 |
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| Impact of Irrigation Schedules on Yield, Water Consumption and Water Use Efficiency of Winter Wheat |
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LIANG Shuoshuo, GUAN Jiexi, LI Lu, SHAO Liwei
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1. Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences/Key Laboratory of Agricultural Water Resources, Chinese Academy of Sciences/Hebei Key Laboratory of Agricultural Water-saving, Shijiazhuang 050022, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| 【Objective】 With freshwater in Hebei Plain becoming scarcer, limiting groundwater extraction for agricultural irrigation has been mandated. Optimizing irrigation schedule of winter wheat using limited water becomes essential to maximizing crop yield to safeguard food production in this region. The overarching objective of this paper is to investigate the impact of irrigation schedule on water consumption and use efficiency of winter wheat during vegetative-production stage, as well as the ultimate yield. 【Method】 A six-year experiment (2012—2018) was conducted in a field plot by limiting the overall irrigation amount to 90 mm. We compared four irrigation frequencies: irrigating all water at the jointing stage (I90), irrigating at the jointing and anthesis stage each with 45mm of water (I45*2), irrigating at jointing, heading and earlier grain-filling stage each with 30 mm of water (I30*3). For each treatment, we measured water consumption at different growing stages and the final yield. 【Result】Increasing irrigation frequency improved water use by the crop during productive stage, benefiting harvest index (HI) and grain weight. The average yield over the six years under treatments I90, I45*2 and I30*3 was 6 878.3, 7 249.1 and 7 568.6 kg/hm2, respectively. There was no significant difference in water consumption between the treatments, despite I45*2 improving WUE at reproductive stage by 23.7%, compared to I90. 【Conclusion】Optimizing irrigation schedule with limited water to winter wheat is able to minimize yield loss. |
| Key words: winter wheat; limited irrigation; water consumption allocation; water use efficiency; small quota irrigation |
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