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Re: First Layer Laterite

There was a time when I thought the AP version was a good substitute for the
Dupla laterite. Then I discovered that the AP laterite is fired into hard,
relatively large granules. Doesn't make sense. Only the fine dust that comes
with them and the surface of those granules would be available for cation
exchange. The rest is locked away inside the granules. I'd recommend going
with Dupla and following their instruction regarding quantity.