| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
This research project focused on soil microbial biomass as the sink and source of base cation nutrients for crops. The aim of this project was to reveal the functions of soil microbial biomass quantitatively by estimating amounts of base cations in soluble, exchangeable and biomass fractions and flow of the cations from the biomass fraction to the soluble and exchangeable fractions in soil. Amounts of biomass potassium and their dynamics were estimated in various farmland soils such as in rice paddy, upland, grassland and orchard soils. The conversion factors for estimation of biomass potassium by the chloroform-fumigation extraction method were presented in the paddy and upland soils. In addition, a turnover time of biomass potassium was calculated for the first time.
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