TY - JA AU - Yoshida,M. AU - Kumada,K. TI - Studies on the properties of organic matter in buried humic horizon derived from volcanic ash, 6: Fulvic acids extracted from buried humic horizons PY - 1980/// KW - Buried soils KW - Fulvic acids KW - Palaeosolic soil types KW - Palaeosols KW - Soil chemicophysical properties KW - AGROVOC KW - Ultrafiltration N1 - Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0038-0768; Tables, graphs, references p. 173-174 T2 - Soil Science and Plant Nutrition ER -