> As I understand it, lava rock has a considerable amount of phosphorus and
> other trace elements bound up in the rock at high concentrations. However
> I've never seen any data on this to back this claim up either.
>
You may be right, I was thinking of mixing powdered lava rock with my
mushroom compost and spreading a thin layer of it under about 3" of fine
sand. I am hoping that will somewhat isolate the nutrients from the water
column. Does anyone know if lava rock contains iron in a form that is
available to plants?
Moon
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