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The Release of Fixed Ammonium from Soils by Sodium as Affected by Small Amounts of Potassium or Ammonium
Author(s) -
Leggett G. E.,
Moodie C. D.
Publication year - 1963
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/sssaj1963.03615995002700060023x
Subject(s) - vermiculite , ammonium , chemistry , potassium , soil water , aeration , sodium , inorganic chemistry , nuclear chemistry , organic chemistry , materials science , geology , soil science , composite material
The release of fixed NH 4 from soils by Na was studied. Data are presented to show that when no K was added to NH 4 ‐saturated air‐dried soils, 86 to 98% of the fixed NH 4 was released during alkaline aeration or distillation. When small amounts of K were added to the alkalizing agents, the release was markedly decreased. When the K/Na ratio of the alkalizing agents was increased to 0.005, only 14 to 35% of the fixed NH 4 was released. Similar effects were noted when small amounts of NH 4 were allowed to accumulate in the system during equilibration of NH 4 ‐saturated soils in various volumes and concentrations of NaCl solutions. The rate of release of fixed NH 4 was studied by aerating NH 4 ‐saturated soils in the presence of Na 2 CO 3 solution. The data obtained indicate that release is slow, even under conditions which favor removal of the released NH 4 from the system. A linear relationship was obtained when the logarithm of rate of release was plotted against time. Thus, it was concluded that the release of fixed NH 4 was similar to the release of fixed K from vermiculite and the later stages of K release from biotite noted by others.