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The Movement of Ammonium Nitrate into Unsaturated Soil During Unsteady Absorption
Author(s) -
Clothier B. E.,
Sauer T. J.,
Green S. R.
Publication year - 1988
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/sssaj1988.03615995005200020007x
Subject(s) - loam , tracer , adsorption , dispersion (optics) , ammonium , soil water , chemistry , absorption (acoustics) , nitrate , wetting , ammonium nitrate , soil science , thermodynamics , materials science , environmental science , organic chemistry , physics , nuclear physics , optics , composite material
An approximate theory for multi‐dimensional transport of inert tracer and reactive chemical during transient wetting of soil is presented. One‐dimensional, unsteady absorption experiments with a free‐water solution of KBr and NH 4 NO 3 were carried out in two contrasting soils. The silt loam had an ammonium solution‐sorbed distribution coefficient, K D , of 5 L/kg, while the fine sand had K D = 2.6 L/kg. These adsorption data were derived from steady‐state, miscible displacement experiments. The dispersion profiles of Br ‐ , NO ‐ 3 , and NH + 4 were reasonably described by the theory in its one‐dimensional form. Time‐dependency observed in NH + 4 adsorption, yet ignored by the theory, is considered to have led to an under‐prediction of dispersion.