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| DOI：10.13522/j.cnki.ggps.2021377 |
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| Change in Winter Wheat Yield and Its Water Use Efficiency as Affected by Limited Irrigation in North China Plain: A Meta-analysis |
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DING Beibei, ZHANG Xueliang, ZHAO Zhenting, et al
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College of Land Science and Technology, China Agricultural University, Beijing 100193, China
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| Abstract: |
| 【Objective】Limited irrigation is a strategy introduced in northern China to alleviate groundwater depletion by marginally scarifying winter wheat yield. The purpose of this paper is to analyze the variation in winter wheat yield and its associated water use efficiency (WUE) following implementation of this strategy.【Method】The analysis was based on experimental studies published in 47 papers; they consisted of 511 pairs of dataset for yield comparison and 459 pairs of data for WUE comparison. In both comparisons, business-as-usual was taken as the control. The effects of different limited irrigation schemes, soil texture and agronomic management on yield and WUE of the wheat were calculated using subgroup analysis.【Result】On average, limited irrigation reduced the wheat yield by 10.5% and increased WUE by 4.3%, with the reduction and increase both depending on irrigation method and irrigation frequency. When the irrigation amount was the same, irrigating the crop three times during its growing season could minimize yield reduction while in the meantime improve WUE. In contrast, reducing the irrigation frequency to twice or once during the growing season of the crop reduced its yield by >10% despite the >5% increase in WUE. To minimize yield reduction due to the limited irrigation, we recommend crop varieties of Shijiazhuang 8 and Shi 4185, with their seeds drilled in the middle of October at planting density of 400~600 plants/m2. Also, increasing organic fertilization, straw mulching, coupled with deep ploughing, was found effective to alleviate yield reduction due to the reduced irrigation. The analysis showed that the limited irrigation was more suitable for implementing in sandy loam soils than in other soils.【Conclusion】Increasing irrigation frequency can partly offset the detrimental impact of the limited irrigation on winter wheat yield in the North China Plain in China. Yield reduction can be further reduced by changing some agronomic management practices such as increasing organic fertilization and deep ploughing. |
| Key words: limited irrigation; winter wheat; seed yield; water use efficiency; Meta-analysis; North China Plain |
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