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Phony Phone

Registered: 09/19/20
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Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone)
#27037089 - 11/13/20 01:33 PM (3 years, 2 months ago) |
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Gypsum: Declumps grain spawn, is a source of calcium and sulfur for mycelium and is a pH buffer.
Limestone: Is a long term pH increasing agent, a long term buffer compared to gypsum (what does that even mean?) provides better form to casings.
Hydrated lime: Instantly provides a basic pH of your liking.
What am I missing? Is gypsum or limestone a stronger buffer? Some cultivators report that gypsum doesn't do much for them but RR used to say a decade ago that gypsum is indeed a pH buffer, albeit it doesn't provide pH upswings like limestone does.
Limestone on the other hand, does increase the pH but on a longer timescale than hydrated lime. How does it do that increase?
Help me settle this once and for all. Thanks.
Edited by Phony Phone (11/13/20 01:42 PM)
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bodhisatta 
Smurf real estate agent


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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: Phony Phone]
#27037200 - 11/13/20 02:34 PM (3 years, 2 months ago) |
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Gypsum doesn't act as a buffer and is very poorly soluble
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AtmozFear
just a shade of myself


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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: bodhisatta]
#27037313 - 11/13/20 03:57 PM (3 years, 2 months ago) |
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Quote:
bodhisatta said: Gypsum doesn't act as a buffer and is very poorly soluble
Huh... you’re right bod, just googled it... I thought it directly buffered ph, but really it just makes better use and raises efficiency of the preexisting ph (my words, not google’s... just my understanding, tell me if I’m wrong)
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Phony Phone

Registered: 09/19/20
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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: bodhisatta]
#27037324 - 11/13/20 04:04 PM (3 years, 2 months ago) |
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What does it do then besides what was stated in the OP?⁵
Also
Quote:
RogerRabbit said:
Quote:
and the gypsum buffers it from metabolites that would increase the pH over time.
Almost. The metabolites want to decrease pH, as in lower it. The gypsum tends to keep pH stable. RR
Rr says it buffers. Im confused.
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AtmozFear
just a shade of myself


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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: Phony Phone]
#27037329 - 11/13/20 04:08 PM (3 years, 2 months ago) |
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provides sulfur for one thing... calcium too but I think more people use it for the sulfur- I know I do with plants (not suggesting there’s any similarity)
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Phony Phone

Registered: 09/19/20
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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: AtmozFear]
#27037338 - 11/13/20 04:17 PM (3 years, 2 months ago) |
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Yeah.. kinda confused with RR's old posts though
Quote:
rogerrabbit said:
Gypsum is not used as a pH buffer, but regardless, it's water soluble so the granulated works fine, and it should be added to casing layers.
Hydrated lime is best for adjusting the pH of peat. If you don't bring the pH up, trichoderma will grow on the uncolonized parts. RR
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AtmozFear
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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: Phony Phone]
#27037352 - 11/13/20 04:24 PM (3 years, 2 months ago) |
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My god a lot of that is wrong and reckless- can’t believe a veteran said all that
Gypsum is absolutely not water soluble, in fact if you mix the shit out of it in water it will just precipitate to the bottom
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Phony Phone

Registered: 09/19/20
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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: AtmozFear]
#27037355 - 11/13/20 04:26 PM (3 years, 2 months ago) |
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Ye ik. Tbh most of it is over a decade old but here is more...
Quote:
RogerRabbit said: I don't know about jiffy mix, but hydrated lime generally IS calcium carbonate or equivalent. It is not a buffer. It will raise the ph. A buffer is used to resist changes in ph. An excellent buffer is gypsum. For peat based casings, I add 1/2 tablespoon of hydrated lime per cup of peat in the mix. Don't count the verm when figuring out how much lime to use. For coir(which I hate as a casing material) use half that amount. RR
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AtmozFear
just a shade of myself


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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: Phony Phone]
#27037361 - 11/13/20 04:28 PM (3 years, 2 months ago) |
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Wow I will just stick to bod n pasty
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bodhisatta 
Smurf real estate agent


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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: AtmozFear] 1
#27037362 - 11/13/20 04:31 PM (3 years, 2 months ago) |
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Im sure I've been dead wrong about a few things. RR is dead wrong about gypsum but he grew up with encyclopedia not wikipedia or Google
Gypsum isn't soluble enough to buffer pH
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Phony Phone

Registered: 09/19/20
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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: bodhisatta]
#27046839 - 11/19/20 07:50 AM (3 years, 2 months ago) |
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then what does gypsum do?
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: Phony Phone]
#27046872 - 11/19/20 08:13 AM (3 years, 2 months ago) |
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Supplies calcium and sulfur and keeps grains from sticking. Basically you can skip it
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Phony Phone

Registered: 09/19/20
Posts: 612
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Re: Let's settle this once and for all. Calcium Carbonate + Calcium Sulfate (Gypsum, Limestone) [Re: bodhisatta]
#27047347 - 11/19/20 01:26 PM (3 years, 2 months ago) |
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why was the myth of ph buffering of gypsum and ph stabilization so widespread back then? tbh i still see the use in CVG as a sulfur and calcium supplement so its still going there
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