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2. Agriculture, Forestry and Fisheries Council of Japan, 1981. Guide for management of upland fields to maintain soil productivity and to prevent soil injury caused by continuous cropping (in Japanese)
3. Physical properties of soils on hilly lands and uplands.;Akiyama,1979
4. Database on Andisols from Japan, Alaska, and Northwestern U.S.A.;Andisol TU database,1992
5. Kinetic study on soil nitrogen mineralization and nitrogen immobilization of paddy soils;Ando;Jap. J. Soil Sci. Plant Nutr.,1986