Subject
Plant Science,Soil Science
Reference12 articles.
1. Kononova , M.M. 1966 .Soil Organic Matter, 2nd , 400 – 404 . Oxford : Pergamon Press .
2. Humus composition of mountain soils in Central Japan with special reference to the distribution of P type humic acid
3. Kumada , K. 1978 .Dojoyukibutsu no Kagaku (Chemistry of Soil Organic Matter), 73 – 79 . Tokyo : Japan Scientific Societies Press . (in Japanese)
4. Characteristics of the green fraction of P type humic acid
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