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Nitrogen Transformations in Soil During Leaching: II. Steady State Nitrification and Nitrate Reduction
Author(s) -
Misra C.,
Nielsen D. R.,
Biggar J. W.
Publication year - 1974
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/sssaj1974.03615995003800020025x
Subject(s) - nitrification , loam , nitrogen , nitrate , leaching (pedology) , chemistry , steady state (chemistry) , oxygen , denitrification , environmental chemistry , inorganic chemistry , soil water , soil science , environmental science , organic chemistry
Nitrogen transformations were examined by means of a miscible displacement technique that permitted passage of air with different levels of oxygen through the soil. With the use of steady state solutions of equations describing the convective transport of NH 4 + and NO 3 ‐ ions in Columbia silt loam, first‐order reaction rate constants k 1 and k 2 were ascertained for NH 4 + ‐oxidation and NO 3 ‐ ‐reduction, respectively. Values of k 1 were measured to be ten‐fold greater than those of k 2 . At an oxygen level of 0.5% in the gaseous phase, nitrification was apparently inhibited.