By Kyoichi Kumada (Eds.)
Regardless of the big variety of papers and books released on soil natural subject (humus), our wisdom of the topic continues to be very constrained, as is our wisdom of humic acid. the writer of this publication started to learn humus on the finish of the Forties and persevered until eventually 1984 while he retired from Nagoya college. With the goal of creating a scientific realizing of soil natural topic, he has compiled proof and a dialogue of humus in line with his large experimental effects up to now forty years.In this publication, humic acids are categorised right into a, B, Rp and P kinds, according to their optical houses. The user-friendly composition and different chemical homes of humic acid kinds are proven to be on a regular basis diverse from one another. a brand new technique for humus composition research utilized to varied forms of soils in Japan and several international locations exhibits that the range of humus compositions of soils is systematically comprehensible. those findings lead the writer to novel theories at the chemical configuration and formation of humic acids and humic ingredients. Diagenesis of humus below terrestrial stipulations is illustrated as to the buried humic horizons of Black soil (Andosol).The e-book could be necessary not just to soil scientists and agronomists but additionally to geochemists, oceanographers, limnologists, water scientists, biologists and chemists who're facing natural topic in terrestrial, aquatic, and sedimentary environments.
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Additional resources for Chemistry of Soil Organic Matter
5% NaOH) ratios of 1 : 300-400. Kawada (1972) compared the ratio of 300, 500, and 700, and recommended the ratio of 1 500. Recently, Ito (1985) obtained maximum yield at the ratio of 1 :300. Anyhow, it is almost meaningless to fix a soil: extractant ratio, because the organic carbon content varies with the soil. (4) Temperature and time Referring to the experimental results reported by Springer (1938) and Hock (1936/1937), the author formerly adopted 100°C and 30 min for extraction of humus. But heating a large amount of soil was not practical, so a room temperature or 30°C and 24 hr were substituted.
The AE,1% values at 280 and 315 nm were large. The curves were very broad, and the plateau-like absorption extended to 450 nm and beyond, judging from Fig. 3-7. It is assumed that the HAS belonging to this group contain some carbonyl groups which affect light absorption throughout the whole UV and visible region. The Pg fraction revealed in the dEi spectra may partly account for the strong light absorption in the visible region. Group 3: Samples belonging to this group were characterized by lignin-like AEi spectra.
When the mixture mounted on a filter paper is washed with water, the former remains on the paper, and the latter is immediately passed through to form a brown filtrate. 0; thus the precipitable fraction may be called watersoluble HA. The Aog K value of its alkaline solution is slightly higher than that of the above mentioned granules, but distinctly lower than that of FA. Accordingly, these two fractions seem to be different from each other, although no further examination has yet been carried out.
Chemistry of Soil Organic Matter by Kyoichi Kumada (Eds.)