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laterite & phosphate

Does anybody know the equivalent of CEC (AEC?) for anions as a measure
for laterite? Does it matter if the laterite is finely powdered or
granular? Jim Kelly mentioned this phenomenon about phosphates and
laterite but I haven't heard anything further of an analytical measure.
One thing I do remember (vaguely) was somebody saying the fixing process
for P in iron hydroxide crystals was very slow. (Roger?)