CHEMICAL STUDIES ON SOIL HUMIC ACIDS : III. Nitrogen Distribution in Humic Acids
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概要
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The levels of amino acid, ammonia, amino sugar, hydrolysable-N, non-hydrolysable-N, and total-N in humic acids obtained from various soils were determined to investigate their relationships to the degree of humification (i.e. RF values) or the types of humic acids. The levels of total-N, hydrolysable-N, and amino acid-N increased from Rp(2)type (obtained from Ao layer humus or rotted plants) to Rp(1)type humic acids (from A layer or plowed layer soils), and then decreased with increasing RF values in the order of Rp(1), P_0,B, and A type humic acids. Most of the nitrogen constituents are presumed to be mineralized during humification. Non-hydrolysable-N increased slightly, but its ratio to total-N increased with RF values especially among A type humic acids. Yields of ammonia by hydrolysis decreased with increasing RF values. The amino acid compositions of 4 different humic acids were similar, and the ratio of amino acid-N to total-N was relatively constant among highly humified A type humic acids, so that proteinous structures in humic acids were presumed to be relatively stable.
- 社団法人日本土壌肥料学会の論文
著者
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Kuwatsuka Shozo
Faculty Of Agriculture Nagoya University
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Tsutsuki Kiyoshi
Faculty Of Agriculture Nagoya University
関連論文
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