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Re: Soil Substrates, Gravel or Laterite

I couldn't find the article, but there was some discussion that higher
amounts of Calcium in a substrate will block nutrient uptake. Did that ever
get confirmed/debunked? A lot of the tropical plants we use come from
locations low in Calcium, but the soils we might use may be high in Calcium.
Dunno. I use laterite/blasting grit. Laterite is very low in Calcium.