| Budget Amount *help |
¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2016: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2015: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
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| Outline of Final Research Achievements |
In this research, the effect of hydraulic retention time on nutrient concentrations of effluent water from a soil column was evaluated. The change of nutrient concentrations in the effluent water decreased by the increase of the infiltration rate. In particular, phosphorus concentration in the soil column tended to become homogeneous by the increase of the infiltration rate. Phosphorus concentration in the effluent water was lower when phosphorus was supplied to the soil column by the slower the infiltration rate. However, the amount of phosphorus absorbed by the soil increased with the infiltration rate. It is confirmed that the nutrient buffering capacity of soils depends on the supply rate of nutrient.
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