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This article in SSSAJ

  1. Vol. 29 No. 2, p. 167-170
    Received: Aug 11, 1964
    Accepted: Sept 9, 1964

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Mineralogical Changes Associated with Ammonium and Potassium Fixation in Soil Clays

  1. C. I. Rich and
  2. J. A. Lutz1



Ammonium and potassium fixation by the 2 to 0.2µ fraction of 14 surface soils, mainly from Southeastern United States, was related to both the decrease in intensity (ΔI) of the 14A X-ray diffraction peak and its shifting (Δd) toward 10A.

A statistical study of the relationship of X-ray diffraction characteristics with K and NH4 fixation showed that in the case of NH4 fixation, 82% of the variation in fixation could be attributed the two factors, ΔI and Δd. The determination of K fixation apparently was confounded by release of native K.

The relationship of NH4 and K fixation to interstratification and interlayering is discussed.

Fixation on a unit weight basis increased with decrease in particle size, but, because of its abundance as well as high fixing ability, the 2 to 0.2µ fraction was generally the most important.

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