| Budget Amount *help |
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2015: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2014: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2013: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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| Outline of Final Research Achievements |
This study aimed to assess the low rice yield in the rainy season and identify its causes, and to show technical countermeasures for it.
The yield of unhulled rice cultivated in the rainy season was almost half of that in the dry season. The main cause of this low yield in the rainy season was decrease in spikelet number / panicle. It is suggested that disorders to growth occurred not only by excess soil reduction but also by meteorological factors, i.e. high temperature, strong wind and low solar radiation. It was revealed that mid-term drainage in the rainy season was effective to moderate soil reduction and keeping floodwater in paddy field from harvest of the dry season cultivation to the beginning of the wet season cultivation inhibits forming acid (sulfuric acid).
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