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Distribution of Nitrogen Forms and Availability Indices in Profiles of Differently Managed Soil Types
Author(s) -
Hadas Aviva,
Feigenbaum Sala,
Feigin A.,
Portnoy Rita
Publication year - 1986
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/sssaj1986.03615995005000020011x
Subject(s) - soil water , mineralization (soil science) , chemistry , calcareous , nitrogen , environmental chemistry , soil type , soil classification , soil science , amidase , hydrolysis , geology , botany , biology , biochemistry , organic chemistry
Various chemical methods have been used to predict the N mineralization potential of soils, but studies have been restricted mainly to surface soil layers, to which most N mineralization is attributed. In this study, the distribution of N forms, extracted from soil by different chemical methods, and the relationship between them were determined within the profiles of several soil types. All N parameters tested were significantly correlated with total N. The fractions of several N parameters of total N changed with soil depth: oxidative release of NH 4 + by acid KMnO 4 , N extracted by NaHCO 3 , and NH 4 + and hexosamine in soil acid hydrolyzate all increased, whereas amino acids and amidase activity decreased with soil depth. Soil type also influenced some N parameters: acid KMnO 4 extracted relatively more NH 4 + from calcareous than noncalcareous soils; a smaller fraction of total N was acid hydrolyzable in soils with a greater surface area; and amidase activity was considerably higher in cultivated clay soils.