When aiming to raise available calcium it is better to use multiple calcium
sources. You may also want to apply a calcium phosphate (soft rock
phosphate), calcium silicate, and calcium nitrate to speed up calcium
availability. I would say you are on the right track by combining oyster
shell powder and gypsum together.

Jon

-----Original Message-----
From: BrixTalk@yahoogroups.com [mailto:BrixTalk@yahoogroups.com] On Behalf
Of Gayla Roberts
Sent: Tuesday, July 07, 2009 11:46 PM
To: BrixTalk@yahoogroups.com
Subject: Re: [BrixTalk] Re: In need of a chemistry lesson

I have plenty of magnesium. Plenty of sulfur. We don't get rain in
California from April to November, just irrigation.
I used both oyster shell powder (fine grind) and gypsum together. We are
deficient on calcium, so I thought I would cover all bets using both. Thanks

for the info.
Gayla
Bob and Gayla Roberts
Always Enough Ranch
Acampo, CA
----- Original Message -----
From: "Frank Egan" <frank@...>
To: <BrixTalk@yahoogroups.com>
Sent: Tuesday, July 07, 2009 8:14 AM
Subject: Re: [BrixTalk] Re: In need of a chemistry lesson


> Gypsum (powder) works pretty fast and is water soluble.
> Should see results the first year. Do you need the
> sulphur component though? In areas of good rains
> sulphur should not be a problem.
>
> Oyster shell is very slow and could take 20 years
> to totally



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