Mineralogical Changes Associated with Ammonium and Potassium Fixation in Soil Clays
- C. I. Rich and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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