| Budget Amount *help |
¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2016: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
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| Outline of Final Research Achievements |
To elucidate the stabilization mechanisms of soil organic C (SOC) in paddy soils and those for cattle manure (CM) and biochar in upland fields as well as to confirm the formation of black humic acids (HAs) owing to volcanic ash were aimed. Progression of simultaneous accumulation of SOC with enhanced stability in terms of C structure and adsorption to clay minerals and labile SOC were found in macro aggregates in paddy soils. Analyses of the archib soil samples from CM applied soils did not indicate an enhancement in the stability of SOC in terms of chemical structure and accumulation form. Biochar equivalent to 33-89% of the initial amount was maintained 5-7 years after application(s) and up to 20% was stabilized by binding to clay minerals. Incubation of Type Rp HAs with volcanic ash at 40-60oC, respectively, increased degree of humification with a larger extent at a higher temperature. The increase in condensed aromatic structures was also suggested for those incubated at 60oC.
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