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Humification of Carbon‐14 Labeled Glucose in Soils of Sanborn Field
Author(s) -
Mutatker V. K.,
Wagner G. H.
Publication year - 1967
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1967.03615995003100010020x
Subject(s) - humin , humus , chemistry , soil water , organic matter , environmental chemistry , humic acid , incubation , carbon fibers , soil organic matter , total organic carbon , organic chemistry , soil science , biochemistry , environmental science , fertilizer , composite number , materials science , composite material
Duing the incubation of C 14 ‐labeled glucose in soil for 3 months, 25% of the radioactive carbon was incorporated in the soil organic matter while the remainder was evolved as CO 2 . Fellowing incubation, the soil organic matter was extracted by 0.5 N NaOH and fractionated. Humin, humic, and fulvic fractions were similarly labeled in a given soil. Generally, soil organic matter resulting from glucose was rather uniform in character for the several soils studied, whereas, that present prior to adding glucose may have differed among soils as a result of humification of diverse substrates. Selective combustion of aliphatic material in each fraction by heating at 170C for 25 days indicated that about 50% of the total carbon in humin and fulvic material and 66% of that in humic acid were aromatic. Aromatic and aliphatic components of the fulvic fraction were about equally labeled in all soils. Humic acid and humin showed less C 14 incorporation into the aromatic than the aliphatic component.