HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (10) Citing Articles via Google Scholar Google Scholar Articles by Hadas, A. Articles by Portnoy, R. Search for Related Content PubMed Articles by Hadas, A. Articles by Portnoy, R. Agricola Articles by Hadas, A. Articles by Portnoy, R.

Distribution of Nitrogen Forms and Availability Indices in Profiles of Differently Managed Soil Types¹

ABSTRACT

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 NH₄⁺ by acid KMnO₄, N extracted by NaHCO₃, and NH₄⁺ 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 KMnO₄ extracted relatively more NH₄⁺ 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.

¹ Contribution from the ARO, The Volcani Center, Bet Dagan, Israel, no. 1423-E, 1985 Series. This research was supported by a grant from the U.S.-Israel (Binational) Agricultural Research and Development Fund (BARD).

² Soil Scientists and Chemist, respectively, Dep. of Soil Chemistry and Plant Nutrition, ARO, P.O. Box 6, Bet Dagan, Israel.

Received for publication June 6, 1985.