I would like to know what are the average estimates for ratios between readily available (let's say accessible by a single extraction with NH4Ac, or AgTU, or BaCl, or KCl...), and "fixed" poorly hydrated cations (as Cs+, K+, NH4+...) in soils. For example, Bolt et al (1963) found that 96% of K were readily available, while only 4% were "fixed" in an illitic soil.
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G. H. Bolt, M. E. Sumner and A. Kamphorst. A Study of the Equilibria Between Three Categories of Potassium in an Illitic Soil.
Soil Science Society of America (Proceedings / Soil Science Society of America), V 27 N 3, p. 294-299, May-Jun 1963
I would recommend:
De Vries, W. 1994; or Van Breemen, N. 1994 ... I did not read all of their research but I came a cross them often in this kind of studies.
Dear Koloman, would you provide me more details about these articles?
There is still discussion about the rate at which plants access K from pools that can be distinguished operationally
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