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Different forms of nitrogen in particle size fractions separated from two soils

M. SCHNITZER and K. C. IVARSON
Plant and Soil
Vol. 69, No. 3 (1982), pp. 383-389
Published by: Springer
Stable URL: http://www.jstor.org/stable/42934146
Page Count: 7
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Different forms of nitrogen in particle size fractions separated from two soils
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Abstract

The possible use of particle size separation of soils in water was tested for preparing fractions rich in 'unknown'-N, which constitutes between 41 and 46% of the total N. Ten particle size fractions ranging from <0.2 to > 1,000.0 µm were separated from the A horizon of the Bainsville soil, an Orthic Humic Gleysol, and from the Bh horizon of the Armadale soil, a poorly drained Podzol. The distribution of N (hydrolyzable-, amino acid-, protein-, amino sugar-, ammonia-, 'unknown'-and unidentified-N) in the initial soils and in each size fraction was determined. While particle size separation did not yield fractions which contained essentially only 'unknown'-N and few known Ncomponents, it was possible to isolate fractions which were either rich in amino acid-or protein-N or in NH₃-N. In general, the finer size fractions tended to be enriched in amino acid-N while NH₃-N was more prominent in the coarser fractions. The amino sugar-N content of all size fractions was low.

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