1. 1) A. E. Kishimoto, Journal of Life Cycle Assessment Japan 18 (2022) 36-42 [in Japanese].
2. 2) 2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories Volume 4, Agriculture, Forestry and Other Land Use, https://www.ipcc-nggip.iges.or.jp/public/2019rf/vol4.html
3. 3) J-Credit Scheme, Methodologies AG-004 Biochar addition to mineral soil in cropland/grassland, https://japancredit.go.jp/pdf/methodology/AG-004_v1.4.pdf [in Japanese].
4. 4) S. Kondo, T. Ishikawa and I. Abe, Kyutyaku no Kagaku (2001) Maruzen.
5. 5) Y. Ono and I. Suzuki, Kyuutyaku no Kagaku to Ouyou (2003) Koudansya Scientific.