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Phosphate-Induced Clay Dispersion as Related to Aggregate Size and Composition in Hapludoxs

Jose M. Limaa, Sharon J. Andersonb and Nilton Curia

a Soil Science Dep., Federal University of Lavras, Minas Gerais, Brazil, 37200-000
b Earth Systems Sci. and Policy, CSUMB, 100 Campus Ctr., Seaside, CA 93955-8001 USA



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  		Fig. 1 Effect of aggregate size on residual sorbed P (bottom bars), desorbed P (upper bars), and total sorbed P (combined bar height) at four initial P concentrations for A and B horizons of Una (UL) and Dark-Red (DR) Latosols. Average and standard deviation for triplicate samples

 


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  		Fig. 2 Effect of pH, aggregate size, and initial P concentration on electrophoretic mobility of dispersed clay from A and B horizons of Una (UL) and Dark-Red (DR) Latosols

 


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  		Fig. 3 Effect of residual P and aggregate size on isoelectric point (IEP) of dispersed clay from A and B horizons of Una (UL) and Dark-Red (DR) Latosols. Average and standard deviation for duplicate samples. Standard deviations smaller than the symbol sizes are not shown

 


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  		Fig. 4 Effect of residual sorbed P and aggregate size on dispersed total clay for A and B horizons of Una (UL) and Dark-Red (DR) Latosols. Average and standard deviation for duplicate samples

 


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  		Fig. 5 Effect of isoelectric point (IEP) - pH and aggregate size on dispersed total clay for A and B horizons of Una (UL) and Dark-Red (DR) Latosols. Average and standard deviation for duplicate samples

 




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