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| DOI：10.13522/j.cnki.ggps.2017.0538 |
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| Response of Rice Growth and Soil Redox Potential to Alternate Drought and Waterlogging Stresses at the Jointing Stage |
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ZHEN Bo, GUO Xiangping, LU Hongfei, ZHOU Xinguo
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1. Framland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;2. College of Agricultural Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| 【Objective】In southern China rice is susceptible to alternate stresses of drought and waterlogging, and this study was to analyze the rice growth and soil redox potential under different drought-waterlogging stresses aimed to provide a guidance for soil water management and rice irrigation. 【Method】The experiments were conducted in pots and we examined two treatments: light drought-light flood-light drought stress (T1), and severe drought-light waterlogging-sever drought, with the conventional irrigation as control (CK). For each treatment, we measured plant height, dry weight, chlorophyll content and soil redox potential (Eh), from which we elucidated the mechanism underlying the effect of water stress on rice growth at jointing stage and the dynamic change of Eh. 【Result】Alternate drought and waterlogging (ASDW) stresses inhibited plant growth up to maturity stage, and the plant height under T1 and T2 was significantly lower than that under CK, decreasing by 8.54% and 13.16% (p＜0.05) respectively. ASDW reduced the chlorophyll content of the leaves, but after re-watering the chlorophyll content recovered gradually and at the late growth period, the leaf chlorophyll content under T1 and T2 increased by 26.65% and 34.41% compared to CK (p＜0.05). At harvest, the root mass under T1 and T2 was significantly higher than that under CK, and the total dry weight under T2 was significantly lower than that under T1 and CK. The root-shoot ratio under T1 and T2 was 1.40 times and 1.67 times of the CK (p＜0.05) respectively. ASDW also increased soil Eh and after the cease of the stress, Eh under T1 and T2 were 3.31 times and 3.23 times of that under CK respectively (p＜0.05). 【Conclusion】ASDW at jointing stage reduced the plant height, delayed the senescence and increased the root shoot ratio. It improved the redox in soil after re-watering, but compared to CK, the actual yield under T1 and T2 decreased by 19.01% and 39.80% respectively. |
| Key words: alternate stress of drought and waterlogging; redox potential; dry matter quality; root shoot ratio; rice |
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