Re: RES: [compost_tea] Re: Correction on Soil Analysis

From: lblair@attglobal.net
Date: Sun Mar 30 2003 - 17:58:56 EST


> to the clay is the following : H+, Na+, K+, Ca++, Mg++

Jose,

I am not a chemist in the slightest degree, so please excuse my
ignorance here;
If gypsum is CaSO4, then I'm guessing that in order for it to tie up
something the Ca is displaced from the molecule
CaSO4 + Na -> NaSo4 + Ca
But of course the Na is not there by itself, so maybe
CaSO4 + NaCl -> NaSO4 + CaCl ???

With this, I don't see how gypsum can remove more Ca.

Or is it that gypsum can 'grab' extra stuff without losing Ca?

Thanks
Lynton


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