Studies on Humus of Tea Soil (Part 1):On Methoxyl Content and Difference Spectrum of Humic Acid

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The methoxyl content and difference spectra were examined of the tea soils derived from Red-yellowish soil, "Kuroboku" and volcanic ash soil and huminlike material. The results were summarized as follows : 1) Methoxyl content decreased with increasing humification degree of these soils. 2) The order of methoxyl content (OCH3-C/T-C × 100) of these soils was as follows: Red-yellowish soil (1 % ≥)> "Kuroboku" = volcanic ash soil (0.2%-0.6%). The difference spectrum of humic acid in Red-yellowish soil indicated ligninlike pattern but those of "Kuroboku" and volcanic ash soil did not indicate such pattern. In the difference spectrum, the absorption band of phenolic hydroxyl group which is conjugated through the benzene ring with a carbonyl group was not observed on humic acid of "Kuroboku" and volcanic ash soil. 3) The difference spectrum of humic acid was distinctly different between "Kuroboku" and volcanic ash soil. 4) The order of the methoxyl content of lignin, "Temporon" (soil conditioner of peat) and "Nitro humic acid" (soil conditioner : lignite was treated with nitric acid) was as follows : lignin (5.21%)> "Temporon" (2.08%) >"Nitro humic acid" (0.66%). The difference spectrum of "Temporon" humic acid clearly indicated a ligninlike pattern but that of "Nitro humic acid" showed a completely different pattern.
日本茶業技術協会の論文