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Fig. 2. Path diagram for the relationship between soil properties and P adsorption by soil. The direct effects (Pij) of soil properties on P adsorption maxima (Smax) are represented by single-headed arrows while the indirect effects (rijPij) of soil properties are shown by double-headed arrows. Subscript designations for soil properties and P adsorption are identified numerically as follows: (1) pH = soil pH; (2) clay = clay content; (3) OC = organic carbon content; (4) Alox = acid ammonium oxalate extractable Al and AlM3 = Mehlich-3 extractable Al; (5) Feox = acid ammonium oxalate extractable Fe and FeM3 = Mehlich-3 extractable Fe; (6) CaM3 = Mehlich-3 extractable Ca; (7) MgM3 = Mehlich-3 extractable Mg; and (8) Smax = P adsorption maxima.
