QI: Quantity-Intensity Relationship of Soil Potassium
The quantity-intensity (Q/I) relationships, first introduced by Beckett
(1964), can be employed to assess the K supplying capacity of different soils
based on solid-solution exchange equilibria. Such relationships describe the
changes in K+ concentration in the soil solution (or the intensity factor) in
relation to the corresponding changes in K+ at exchange sites of the soil
(or the capacity or quantity factor). Activity ratio of K to Ca or Ca+Mg
is generally used as the variable denoting the intensity, whereas, change
in exchangeable K is used to denote the quantity factor.
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