| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Outline of Final Research Achievements |
Using phosphate efficiently is important because phosphate is one of the nutrients that are essential for plant growth and one of the limited resources. The purpose of this study is to develop a new system to recycle of phosphate from paddy fields. In order to attain this goal, we investigated the mechanism that phosphate accumulated in paddy soil is released to flooded water and obtained following results. First, the phosphate in paddy soil is released to flooded water when the pH of flooded water is lager than 9. Second, the growth of periphyton relating to increase in pH of flooded water depends on the nitrogen dynamics with the activation of microorganisms in paddy soil. Third, the growth of periphyton may be affected by the convection of flooded water.
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