| Budget Amount *help |
¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
This study revealed that when soil P levels reached nearly the maximum P sorption capacity of soils due to the long-term fertilizer application, the surplus P was accumulated as calcium phosphate (Ca-P). Particularly in the compost amended soils, Ca-P was heterogeneously distributed and formed micro hot spots. Such segregation of Ca-P in soil microstructure functions to prevent P from sorbing on soil minerals strongly. Solid-state NMR measurements for soil extraction residues revealed that soluble and insoluble soil Ca-P species can be differentiated by combined uses of Truog and acetic
acid extractions.
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