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The Thermal Release of Ammonium Nitrogen from Ammonium Chloride‐Treated and Nontreated Soils
Author(s) -
Porter L. K.,
Stewart B. A.
Publication year - 1966
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/sssaj1966.03615995003000030020x
Subject(s) - soil water , ammonium , chemistry , nitrogen , ammonium chloride , chloride , organic matter , ammonia , environmental chemistry , nuclear chemistry , soil science , geology , organic chemistry
Abstract Comparisons were made of the thermal release of NH 4 + ‐N from soils and NH 4 + ‐saturated soils. Fixed NH 4 + ‐N was lost from untreated and NH 4 Cl‐treated soil samples when the samples were subjected to temperatures above 400C. A treatment of 800C for 5 min generally released more than 85% of the fixed NH 4 + ‐N. However, small amounts of indigenous fixed NH 4 + ‐N, 25 to 30 ppm N, may be retained by some soils when they were subjected to a temperature treatment of 1,000C for 5 min. Release of exchangeable NH 4 + ‐N was essentially completed when samples were subjected to a treatment of 500C for 5 min. The nontreated surface soils exhibited sharp increases, three‐ to sixfold, in their exchangeable NH 4 + ‐N when samples were heated at 250 or 300C for 5 min. It is suggested that these increases were derived from NH 4 + ‐N being released as soil organic matter decomposed.