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| Influence of drought and flood alternation stress in different growth stages on rice yield and components |
| CAO Ruizhe1*, GAO Shikai2 |
| 1. Shanghai Water Engineering Design and Research Institute Co. Ltd., Shanghai 200061, China; 2. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China |
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Abstract Using water level in rice fields as a regulation index of drought and flood alternation stress, the changes of rice growth, yield and components in different growth stages under drought and flood stress were studied experimentally in the paper. Field experiments were conducted by employing evapotranspiration absorption(ETA)bed in tillering, jointing and booting, heading and flowering as well as milky stages. The drought and flood alternation stresses occurred in four major growth periods could affect rice yield, especially the stress in jointing and booting stages, which could reduce the yield by 14.67% and 20.16% in maximum, respectively. The stresses in tillering stage could decrease number of rice panicles by 5.76% to 8.94%. The stresses in jointing and booting stages as well as heading and flowering stages could decrease number of grains per panicle by 6.07% to 9.57%. The stresses in hea-ding and flowering stages as well as milky stages could decline seed setting rate, especially, that in heading and flowering stages, which resulted in reductions of seed setting rate by 5.89% and 7.24% in maximum. The stress in milky stage could lower thousand grain weight by 3.81% and 5.70%. The successive drought and flood alternation stresses in multiple growth stages can produce a superposition effect and affect rice yield severely. This situation should be avoided as much as possible in ordinary rice planting.
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Received: 26 September 2017
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