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OfflineRogerRabbitM
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Re: Do not add gypsum to cakes! [Re: HybridprX]
    #15310815 - 11/01/11 08:59 PM (12 years, 3 months ago)

Quote:

HybridprX said:
Im making a post to inform others of the hazard of adding gypsum to their pf cake substrate.

If whoever decides to add gypsum, put it in the water and P.H balance to 5-6 before adding it to the dry ingredients.

Im not sure of the P.H of the water I used but adding that 1tbs of gypsum with no P.H up+ lowered it enough that not even one single spore germinated from a one day old spore print.

The one grow I did, I did not add gypsum, it worked. The second two I added gypsum and as I said, nothing grew so.... Yea, If it works for others its because your waters ph is high enough that the tbs of gypsum lowers it to optimal conditions for germination.





You are absolutely incorrect.

First of all, gypsum isn't going to alter the pH much, other than to return it to neutral, since it's neutral or nearly so.  In addition, mushroom mycelium prefers to germinate and grow at a pH of around 5, so your hypothesis about what went wrong(low pH) is totally off the mark.  Furthermore, why would you add something to lower the pH, add gypsum and then raise the pH???  It makes no sense whatever.  You screwed up somewhere else, but it wasn't the gypsum.

Quote:

HybridprX said:
I personally feel that the tap waters ph that I used was already low and the addition of the gypsum lowered it enough that the spores will not germinate.




If the pH of the tap water was low, the gypsum would have raised it back towards neutral.  I'd suggest some more reading about mineral supplements. 

Also, the idea expressed earlier that gypsum, a rock that is quarried out of the ground would have fungicides, is ridiculous.
RR


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OfflineJaffyJaffar
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Re: Do not add gypsum to cakes! [Re: RogerRabbit]
    #15310970 - 11/01/11 09:23 PM (12 years, 3 months ago)

boom goes the dynamite


i used gypsum and harvested about an oz out of 4 cakes with only 1 flush and 2 cakes in 2 flushes


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OfflineKoD
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Re: Do not add gypsum to cakes! [Re: RogerRabbit]
    #15311000 - 11/01/11 09:28 PM (12 years, 3 months ago)

Gypsum has calcium sulfate dihydrate which is believed to be good for the mycelium and/or fruiting bodies. It acts as a buffer as well. Calcium sulfate will slightly acidify a substrate as sulfuric acids evolve.
You should add a base to your acidic substrate.


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Invisible13shroomsM
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Re: Do not add gypsum to cakes! [Re: KoD]
    #15311234 - 11/01/11 10:18 PM (12 years, 3 months ago)

this thread is nothing but fail (minus RRs post)  :failboat:

:facepalm3:

gypsum at any stage of growth is benifical no doubt, no further "testing" required... I even have added it to my agar mix b4 to add calcium/sulfate at each growth stage. :yesnod:

gypsum = good for mushroom growth at any time/phase. :super:


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InvisibleJavadog
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Re: Do not add gypsum to cakes! [Re: 13shrooms]
    #15311319 - 11/01/11 10:34 PM (12 years, 3 months ago)

Well 13, I tried.

I need to leave these things to TCs.  Only you guys are trusted.

Later,

JD


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Invisible13shroomsM
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Re: Do not add gypsum to cakes! [Re: Javadog]
    #15311354 - 11/01/11 10:40 PM (12 years, 3 months ago)

Quote:

Javadog said:
If there is a "safe supplement" among all those we consider, it would be gypsum.

Even WBS jars can use a pinch, even if only to help prevent clumping.

It is nutritious.

It also has the effect of buffering the sub against pH changes.

It is safe to use.  The OP ran up against something else, if I had to guess.

Take care,

JD



Quote:

Javadog said:
Well 13, I tried.
Later,

JD




:bigyesnod:

:scaryshroom::thumbup:


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OfflineHybridprX
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Re: Do not add gypsum to cakes! [Re: 13shrooms]
    #15316588 - 11/03/11 06:04 AM (12 years, 3 months ago)

I will prepare nine pfcakes, 3 with gypsum, 3 without and 3 with gypsum and the addition of coffee.


Im not trying to be smart but RR you said you use coffee with your soak water so wouldnt that raise the overall ph and then the addition of gpsum would lower it to a favorable level for spore germination?

and to be totally honest, I cant remember what TMC said was optimum substrate ph for spore germination.... I'll review it later today.

Im not going to rule out the possability of the gypsum containing a fungicide agent just yet since when I added it to the bulk material the mycelium was extremely healthy and we all know how versitile it can be. I will take plenty of pictures and post the results shortly.


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Invisible13shroomsM
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Re: Do not add gypsum to cakes! [Re: HybridprX]
    #15316612 - 11/03/11 06:25 AM (12 years, 3 months ago)

coffee adds nitrogen, doesnt swing the PH enough to worry about. IME. :strokebeard:

Ive never even tested the ph when growing cubes. :mushroom2:


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InvisibleFooMan
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Re: Do not add gypsum to cakes! [Re: HybridprX]
    #15316634 - 11/03/11 06:40 AM (12 years, 3 months ago)

Quote:

HybridprX said:
Im not trying to be smart but RR you said you use coffee with your soak water so wouldnt that raise the overall ph and then the addition of gpsum would lower it to a favorable level for spore germination?




Coffee is acidic so if anything it would lower the pH not raise it.


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InvisibleFooMan
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Re: Do not add gypsum to cakes! [Re: 13shrooms]
    #15316643 - 11/03/11 06:44 AM (12 years, 3 months ago)

Quote:

13shrooms said:
Ive never even tested the ph when growing cubes. :mushroom2:




Seriously. Especially cakes. 2:1:1 verm, brf, H2O

Done deal.


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InvisibleDoctor_Inoc
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Re: Do not add gypsum to cakes! [Re: HybridprX]
    #15316969 - 11/03/11 09:37 AM (12 years, 3 months ago)

Quote:

HybridprX said:
Im not going to rule out the possability of the gypsum containing a fungicide agent just yet since when I added it to the bulk material the mycelium was extremely healthy and we all know how versitile it can be. I will take plenty of pictures and post the results shortly.



Should state on the packaging whether or not there's an anti-fungal in the gypsum used.  Use agricultural grade gypsum, sourced from a local nursery/greenhouse retailer/wholesaler. 

Whether or not gypsum or any substrate material and/or additive is treated with a fungicide'll only cause SPORES not to germinate.  An already established mycelial culture won't be phased by the addition of fungicide(s) to the substrate materials and/or additives.


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Offlineghostshadow422
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Re: Do not add gypsum to cakes! [Re: Doctor_Inoc]
    #19067516 - 11/01/13 12:58 AM (10 years, 3 months ago)

I've seem to have gotten about 5 grams dried per half pint cake, how much more is the yield from the added gypsum? the post above said an oz from 4 cakes? is that dried or fresh? and is that using hp cakes?


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OfflineRogerRabbitM
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Re: Do not add gypsum to cakes! [Re: HybridprX]
    #19067598 - 11/01/13 12:58 AM (10 years, 3 months ago)

This thread has been closed.

Reason:
This thread is too full of fail for a bump.  It will only screw up people's grows by misinformation from those who don't understand pH.
RR


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