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Path and Multiple Regression Analyses of Phosphorus Sorption Capacity

^a Dep. of Plant and Soil Sciences
^b Dep. of Biosystems and Agricultural Engineering
^c Dep. of Statistics, Oklahoma State Univ., Stillwater, OK 74078
^d School of Natural Resources, The Ohio State Univ., Columbus, OH 43210

View larger version (18K): [in a new window]   Fig. 1. Locations of the 28 Oklahoma benchmark soils used in this study along with delineation of major land resource areas.

View larger version (24K): [in a new window]   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.

View larger version (13K): [in a new window]   Fig. 3. Relationship between P saturation indexes using acid ammonium oxalate (PSIox) and Mehlich-3 (PSIM3) as extractants for 28 Oklahoma benchmark soils. **p < 0.01.

View larger version (24K): [in a new window]   Fig. 4. Relationships between a P saturation index calculated from Mehlich-3 extractable P and Smax (Psat), and (A) a P saturation index calculated from acid ammonium oxalate extractable data (PSIox) for all 28 soils; (B) PSIox for soils with pH < 7.0; (C) a P saturation index calculated from Mehlich-3 extractable data (PSIM3) for all 28 soils; or (D) PSIM3 for soils with pH < 7.0. **p < 0.01.