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Some Aspects of Ammonia Sorption by Soil Surfaces
Author(s) -
Coffee R. Clifford,
Bartholomew W. V.
Publication year - 1964
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/sssaj1964.03615995002800040012x
Subject(s) - sorption , soil water , cation exchange capacity , environmental chemistry , organic matter , chemistry , soil horizon , clay minerals , soil science , mineralogy , adsorption , geology , organic chemistry
Rates of sorption of NH 3 through soil surface boundaries, the extent of penetration into thin surface strata, and relative sorbing capacities of surface layers were determined for soil materials from several Coastal Plain and Piedmont soils. NH 3 sorption through soil surface boundaries was rapid from aerial applications ranging from 1.3 to 1.9 mg. NH 3 ‐N per cm. 2 of surface area. Specific rate of sorption was directly proportional to the concentration of NH 3 remaining above the soil surface. NH 3 nitrogen sorbed by soil in the surface strata did not penetrate more than 10–20 mm. into the soil when applied at rates ranging from 0.17 to 1.00 mg. NH 3 ‐N per cm. 2 of surface. The depth distribution of NH 3 changed with time of contact with NH 3 without appreciable change in total NH 3 sorbed. In general clay soils sorb more efficiently than sandy soils, soils with low pH more efficiently than those with high pH, and soils with high organic matter contents were less efficient than mineral soils with similar cation‐exchange capacities.