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An evaluation of naturally occurring fixed ammonium in soils

Published online by Cambridge University Press:  27 March 2009

J. R. Freney
J. R. Freney
Affiliation:
Division of Plant Industry, C.S.I.R.O., Canberra, A.C.T., Australia
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Extract

1.Fixed ammonium could be completely recovered from clay minerals by leaching small amounts of clay with large volumes of salt solutions (containing the cations but not K+, Rb+, or Cs+), but no clay fixed ammonium could be found in soils when analysed by this technique.

2. It is suggested that ammonium fixation is largely a laboratory phenomenon caused by the use of extractants containing potassium ions which trap exchangeable ammonium, or the use of reagents which decompose organic nitrogen compounds.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 63 , Issue 3 , November 1964 , pp. 297 - 303
Copyright
Copyright © Cambridge University Press 1964

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