The chemical nature of components of PG (Green fraction of P type humic acid)
Open Access
- 1 December 1976
- journal article
- research article
- Published by Taylor & Francis in Soil Science and Plant Nutrition
- Vol. 22 (4) , 485-488
- https://doi.org/10.1080/00380768.1976.10433011
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.Keywords
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