ISSN:
1435-0661
Keywords:
DR, Dark-Red Latosol EM, electrophoretic mobility IEP, isoelectric point UL, Una Latosol
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
M NaCl) on EM, IEP, and clay particle dispersion in aggregates of Oxisols with different organic matter contents and hematite/goethite ratios. Aggregates of 1 to 2 and 0.1 to 0.2 mm were fractionated from samples of A and B horizons of two Oxisols, both with 165 g kg−1 Fe2O3, that differ in their organic matter and hematite and goethite contents. Phosphate sorption decreased EM and IEP of B horizon aggregates. It also decreased the amount of dispersed clay, as the IEP decreased to values closer to the pH of the soil suspension, decreasing net positive charge. Then, P sorption increased dispersed clay as the IEP became lower than the pH of suspension. The effect was slightly higher on aggregates with higher hematite/goethite ratio. The changes on those parameters were mostly noted for B horizon samples, where phosphate sorption had a major effect on charge balance because of their lower organic matter content. Small aggregates had less dispersed clay than large aggregates.
Type of Medium:
Electronic Resource
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