Distribution and partial characterisation of acid hydrolysable organic nitrogen in six New Zealand soils

Six New Zealand topsoils of widely different origins and properties were subjected to 6m HC1 hydrolysis and the distribution of N fractions and amino acids were determined qualitatively and quantitatively. Of the total-N in the soils studied 83–91%, was hydrolysable with 6 m HCl. The largest proport...

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Bibliographic Details
Published in:Soil biology & biochemistry 1979, Vol.11 (2), p.127-132
Main Authors: Goh, K.M., Edmeades, D.C.
Format: Article
Language:English
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Summary:Six New Zealand topsoils of widely different origins and properties were subjected to 6m HC1 hydrolysis and the distribution of N fractions and amino acids were determined qualitatively and quantitatively. Of the total-N in the soils studied 83–91%, was hydrolysable with 6 m HCl. The largest proportion of the hydrolysable N was α-amino acid N (38– 42%). followed by hydrolysable-unknown N (HUN) (14–24%), and NH 4 +-N (14–22%). A significant proportion (25–50%) of the HUN fraction was accounted for by the non α-amino acid-N. Oxidative (3% H 2O 2) hydrolysis released N-phenoxy amino acid-N and possibly N-compounds which were complexed with phenols and sugars. All soils had a similar amino-acid composition with a predominance of acidic amino-acids.
ISSN:0038-0717
1879-3428
DOI:10.1016/0038-0717(79)90088-9