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Forms of calcium and boron

I have two questions to direct to Dave Huebert.
(Hello Dave)

A while back in a post concerning calcium, potassium and magnesium
requirements you said, "Calcium is also necessary external to the cell
membrane for normal cell wall development ... internal Ca requirements
are actually quite low and in fact ionic Ca is extremely toxic to plant
cell function." You don't mean that CaCl2 shouldn't be present in the
water column? Is there a preference for a particular form of calcium,
say bicarbonate?

Second question: Is borax suitable as a source of boron or would boric
acid be better?


Dave Whittaker
ac554 at FreeNet_Carleton.ca