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Contribution of charred and buried plant fragments to humic and fulvic acids in Japanese volcanic ash soils |
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| Authors: | Syusaku NISHIMURA Tomoki HIROTA Osamu HIRAHARA Haruo SHINDO |
| Institution: | Faculty of Agriculture, Yamaguchi University, Yamaguchi 753-8515, Japan |
| Abstract: | |
| Keywords: | charred plant fragment fulvic acid Japanese volcanic ash soil specific gravity method Type A humic acid |