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Asian Journal of Earth Sciences
  Year: 2010 | Volume: 3 | Issue: 3 | Page No.: 130-135
DOI: 10.3923/ajes.2010.130.135
 
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Extraction and Characterization of Humic and Fulvic Acids from Latosols under Tea Cultivation in South India

S. Jayaganesh and V.K. Senthurpandian

Abstract:
Humic substances are considered as the most important constituents of soils. They form the largest fraction of soil organic matter and play a dominant role in improving soil productivity. Humic substances promote plant growth and improve the organic matter status of soil and soil fertility. The common method of extracting of humic substances is by treatment with alkali; dilute sodium hydroxide is generally used. Initially, the soil should be washed with 1 N HCl solution. Humic acid showed broad absorption centered around at 3360, 1406, 1233 and 1060 cm-1 regions. The phenolic (OH), amide, methyl, free-NH- bond, carboxylic and carbonyl group are present in the humic and fulvic acids. The absorption around 1715 cm-1 region was identified to be due to C=O stretching of carbonyl or ketonic groups. The organic matter content of humic and fulvic acids are highly influenced by physical parameters of soil. The organic matter content in humic acid was higher (61%) in Munnar soils, followed by Gudalur and Anamallais soils 56 and 55%, respectively. The organic matter content in fulvic acids is lower when compared to humic acid. The organic matter of the soil is positively correlated with organic matter of humic acid. The available magnesium content in fulvic acid is negatively correlated with potassium content of fulvic acid. The organic matter of the soil is negatively correlated with exchangeable K of humic acid and the same trend observed between available K and organic matter of humic acid.
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How to cite this article:

S. Jayaganesh and V.K. Senthurpandian, 2010. Extraction and Characterization of Humic and Fulvic Acids from Latosols under Tea Cultivation in South India. Asian Journal of Earth Sciences, 3: 130-135.

DOI: 10.3923/ajes.2010.130.135

URL: https://scialert.net/abstract/?doi=ajes.2010.130.135

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