Effect of Submergence on Rice Yield in the Red River Delta, Vietnam
Effect of Submergence on Rice Yield in the Red River Delta, Vietnam
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越南红河三角洲淹没对水稻产量的影响
DOI：
10.11248/jsta1957.49.197
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
T. Sakuratani
中科院分区：
文献类型：
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作者：
A. Kotera;E. Nawata;Le Vinh Thao;N. Vuong;T. Sakuratani
在不同生长阶段完全淹水5天后，比较了高产品种（HYVs）Tap Giao 4和CR 203以及在越南红河三角洲广泛种植的当地品种Moc Tuyen之间的水稻产量，以评估引入HYVs之前和之后水稻耐淹性的差异。尽管淹水时减产最严重的品种因生育阶段而异，但除了分蘖期淹水外，Moc Tuyen的产量在三个品种中最低。根据这些结果和严重水灾发生的模式，似乎预计在该地区引进这两辆HYV不会增加水灾对水稻生产的损害。然后，我们测试了在不同生长阶段的不同持续时间的2天、5天和8天的淹没效果的进一步方面，以及使用CR 203的水深，即植物的四分之三或完全淹没的淹没，以检测临界条件，在该临界条件下，产量降低将被增强。在分蘖期以株高的四分之三进行淹涝处理时，即使淹涝8 d，产量也几乎没有下降，而在完全淹涝处理中，淹涝时间超过5 d，产量下降严重。因此，有可能通过将完全淹没的持续时间限制在2天以内来减轻CR 203在分蘖期的产量降低。
The yield of rice after 5 days of complete submergence at different growth stages was compared between the high-yielding varieties (HYVs), Tap Giao 4 and CR203, and a local variety, Moc Tuyen, cultivated extensively in the Red River Delta, Vietnam, to assess the difference in the rice flooding tolerance before and after the introduction of HYVs, which are generally considered to be susceptible to flooding. Although the variety with the most severe yield reduction was different depending on he growth stages when submerged, the yield of Moc Tuyen was the lowest among the three varieties except for submergence at the tillering stages. Based on these results and the pattern of severe flooding occurrence, it appears that flooding damage to rice production was not anticipated to increase by the introduction of these two HYVs in this region. Then, we tested further aspects of the effect of submergence at different growth stages for different durations of 2, 5 and 8 days, and water depths, namely submergence of three-quarters or full submergence of the plants, using CR 203, to detect critical conditions, under which yield reduction would be enhanced. When the plants were submerged at the tillering stages with three-quarters of plants height, the yields hardly decreased even in the 8 days of submergence, whereas in the plants with complete submergence, the yields decreased severely by submergence lasting for more than 5 days. It could thus be possible to mitigate the yield reduction of CR 203 at the tillering stages by limiting the duration of complete submergence to less than 2 days.