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| DOI：10.13522/j.cnki.ggps.20170022 |
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| Effects of Deficit Irrigation on Chlorophyll Fluorescence Parameters，Yield and Water Use Efficiency of Rice in Cold Region |
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YANG Hua， ZHANG Zhongxue， ZHENG Ennan， FU Hanwen， LUO Jiarui， HAN Jiankun
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1.School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China;2.Key Laboratory of Effective Utilization of Agricultural Water Resources, Ministry of Agriculture, Harbin 150030, China;3.Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China;4.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;5.College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| 【Objective】 Plant physiological development is determined by soil moisture content and temperature, and this study was to investigate the effects of deficit irrigation on chlorophyll fluorescence parameters of rice at different growth stages and its ultimate yield. 【Method】 Pot experiments were conducted; we examined 15 treatments by keeping soil continuously at water deficit during a single growth stage or two growth stages either at moderate water deficit or severe water deficit; normal sufficient irrigation was used as control. 【Result】 Moderate deficit lasting continuously for one growth stage or two enhanced the Fv/Fm and Fv'/Fm' of the leaves significantly, while severe water deficit did not changed the Fv/Fm and Fv'/Fm' significantly compared to the control. Water deficit at the tillering stage did not lead to a noticeable change in the final number of effective tillers, but significantly increased the effective tillering rate while decreasing the water and nutrient loss caused by ineffective tillering. Moderate water deficit lasting for a single growth stage did not reduced yield despite its significant increase in water use efficiency. Water use efficiency under moderate water deficit at the tillering stage was the highest, being 1.460 g/kg. 【Conclusion】 Moderate water deficit lasting for a single growth stage is a suitable water deficit irrigation for rice without compromising its yield. |
| Key words: rice; water deficit irrigation; chlorophyll fluorescence; yield |
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