The chemical nature of components of PG (Green fraction of P type humic acid) |
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| Authors: | Osamu Sato |
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| Institution: | Water Research Institute, Nagoya University , Nagoya , Japan |
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| Abstract: | P type humic acids showing characteristic absorption maxima at 615, 575, and 450 nm have been found in various types of soils around the world (3, 5, 7,8). P type humic acid was fractionated into a brown fraction (Pb) and a green fraction (Pg) by column chromatography using cellulose powder (4) or Sephadex gel (3). The Pg fraction which has a strong absorption maxima at 615, 575, and 450 nm causes the characteristic absorption pattern of P type humic acid. |
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| Keywords: | CO2 evolution rate composting plant residues seed germination index total extractable lipid phosphates |
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