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| DOI：10.13522/j.cnki.ggps.2017.0598 |
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| Effects of Regulated Deficit Irrigation on Physiological Characteristics and Water Consumption of Jujube in Arid Area |
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AI Pengrui, MA Yingjie
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College of Water Conservancy and Civil Engineering， Xinjiang Agricultural University， Urumqi 830052， China
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| Abstract: |
| 【Objective】 Plant development depends on soil water and this paper is to investigate how physiological characteristics and water consumption of jujube growing in arid area changed in response to regulated deficit irrigation. 【Method】The experiment was conducted in a field in which the changes of physiological traits of the jujube were analyzed under three water treatments: sufficient irrigation treatment (C1), moderate water-stress treatment (C2) and severe water-stress treatment (C3) via regulated deficit irrigation during fruit expansion period. 【Result】 Water deficit significantly reduced the physiological characteristics and reduced leaf photosynthetic index by 8%～27% and water consumption by 13%～38% respectively. Compared with C1, C3 treatment reduced the yield by 18%. After re-watering, the physiological indexes at C2 treatment all restored to or higher than the level at C1 treatment. In contrast, the recovery rate of all indexes under C3 treatment was slow, and some were 10% lower than that under C1. 【Conclusion】Without compromising fruit yield, water stress could reduce the physiological index and water consumption, thereby reducing the workload of cutting in summer. It also diverted the nutrient otherwise used for growth to fruit cell division. However, excessive water stress could lead to irreversible damage to plant organs, and as such, even after re-watering the final yield of plant organs and fruits were unable restored to the levels under sufficient irrigation. |
| Key words: jujube; regulated deficit irrigation; physiological traits; water consumption |
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