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Offlinemushluv
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ph
    #11269157 - 10/18/09 02:42 AM (8 years, 5 days ago)

i havent found much about controlling ph in a casing, i see hydrated lime or oyster shell seems to be the way to go, but costly around here, is there any good sub for this? i know egg shells are composed of calcium carbonate just like lime and oyster shell, if i powder it up do u think it could work? how bout baking soda? any chemistry majors in the house? maybe we can take a vote..
what is the popular opinion?
who perfers what?


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Offlinemushluv
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Re: ph [Re: mushluv]
    #11269202 - 10/18/09 02:51 AM (8 years, 5 days ago)

i was told bicarb.. maybe like baking soda.. would that work?


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Invisibletruskool
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Re: ph [Re: mushluv]
    #11269210 - 10/18/09 02:54 AM (8 years, 5 days ago)

Ive never used a ph buffer in casing I don't think its really needed not IME anyways.  You can add gypsum for a buffer.  Take some drywall and break it down and there you go


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Offlinemushluv
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Re: ph [Re: truskool]
    #11269217 - 10/18/09 02:55 AM (8 years, 5 days ago)

gypsum...so u just do verm/peat and bam? no losses?


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Invisibletruskool
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Re: ph [Re: mushluv]
    #11269223 - 10/18/09 02:57 AM (8 years, 5 days ago)

yea i use 2:1:1 pet:ver:perlite
Of course I lose things thats just a part of growing shrooms, but nothing too bad.  Gypsum works great tho its pretty much free and easy to use.  Most things are in the shroom PH levels.  Coir, verm, perlite all these are in the PH levels that shrooms like


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Offlinemushluv
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Re: ph [Re: truskool]
    #11269321 - 10/18/09 03:23 AM (8 years, 5 days ago)

kool ty


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InvisibleFlop Johnson
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Re: ph [Re: truskool]
    #11269327 - 10/18/09 03:26 AM (8 years, 5 days ago)

Quote:

truskool said:
Ive never used a ph buffer in casing I don't think its really needed not IME anyways.  You can add gypsum for a buffer.  Take some drywall and break it down and there you go




Correct me if I'm wrong, but IME a lot of new/nicer drywall has a fungicide mixed in with the gypsum/bonding agent. I noticed this a while back while I was redoing a wall in the garage :mushroom2:


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Invisibletruskool
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Re: ph [Re: Flop Johnson]
    #11269332 - 10/18/09 03:28 AM (8 years, 5 days ago)

some does it is coloured differently.  i think the fungicide drywall has green striping on it.  Don't quote me on that but there is a way you can tell.  If its cheap drywall it wont have fungicides in it.  I don't think a lot of drywall has it in it


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InvisibleFlop Johnson
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Re: ph [Re: truskool]
    #11269352 - 10/18/09 03:32 AM (8 years, 5 days ago)

Quote:

truskool said:
some does it is coloured differently.  i think the fungicide drywall has green striping on it.  Don't quote me on that but there is a way you can tell.  If its cheap drywall it wont have fungicides in it.  I don't think a lot of drywall has it in it




You're probably right. I stole the drywall from an apartment complex that was under construction, so I guess they might have been taking some extra measures for building longevity.


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Invisibletruskool
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Re: ph [Re: Flop Johnson]
    #11269357 - 10/18/09 03:33 AM (8 years, 5 days ago)

Yea it doesnt seem to be that common.


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OfflinePsuper
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Re: ph [Re: truskool]
    #11269411 - 10/18/09 03:52 AM (8 years, 5 days ago)

The post i quoted below is relevant to this.
Folks in the forums here misuse the word buffer. 
Remember that crushed oyster shell is only used for texture in the casing layer or even bulk sub.  It's oyster shell flour that we use to raise the pH

Quote:

Psuper said:

Oyster shell is calcium carbonate, hydrated lime is calcium hydroxide.  We use hydrated lime or oyster shell flour to raise the pH.  Gypsum helps hold the pH steady, but this is NOT what a pH buffer is.  I know people constantly refer to gypsum as a "buffer", but that's not what that word denotes in chemistry.  Crushed oyster shell is only used for texture, it is oyster shell flour that raises the pH.

You are supposed to wait at least an hour after making up your casing layer mix before testing the pH.  Also, if you follow RR's tek for prepping the 50/50+ you add the vermiculite after testing/adjusting the pH. Hope this helps. ~Pixie~





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P. Cubensis Bulk Substrate:
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OfflineRogerRabbitM
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Re: ph [Re: Psuper]
    #11270015 - 10/18/09 10:10 AM (8 years, 5 days ago)

Correct.  Gypsum is not a pH buffer.  Gypsum is used to supply calcium and sulfur. 

Oyster shells, egg shells, calcium carbonate, etc., are all piss-poor buffers for casings because they take a month or more to become effective, even when powdered.  That's why you want to use hydrated lime.  It's water soluble and raises pH immediately.

NEVER USE BAKING SODA IN YOUR CASING LAYERS!  It's not an appropriate way to raise pH, and is highly toxic to mycelium.

Substrates don't need a pH correction.  Mushroom mycelium actually prefers an acidic pH and grows fastest when the pH is between 5 and 6.  However, since casing layers usually don't fully colonize, we buffer them to a pH of about 8 to help prevent mold spores from germinating.  The live mushroom mycelium can tolerate a high pH, but it's hard for spores to germinate.
RR


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Offlineevildee125
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Re: ph [Re: RogerRabbit]
    #11278203 - 10/19/09 05:41 PM (8 years, 3 days ago)

Quote:

RogerRabbit said:
Correct.  Gypsum is not a pH buffer.  Gypsum is used to supply calcium and sulfur. 

Oyster shells, egg shells, calcium carbonate, etc., are all piss-poor buffers for casings because they take a month or more to become effective, even when powdered.  That's why you want to use hydrated lime.  It's water soluble and raises pH immediately.

NEVER USE BAKING SODA IN YOUR CASING LAYERS!  It's not an appropriate way to raise pH, and is highly toxic to mycelium.

Substrates don't need a pH correction.  Mushroom mycelium actually prefers an acidic pH and grows fastest when the pH is between 5 and 6.  However, since casing layers usually don't fully colonize, we buffer them to a pH of about 8 to help prevent mold spores from germinating.  The live mushroom mycelium can tolerate a high pH, but it's hard for spores to germinate.
RR




im glad you and psuper corrected this.. lately people have been recommending gypsum in casing layer which doesnt make sense considering what a buffer is suppose to achieve is what you mentioned (raising pH so spores are less likely to germinate)... um i dont know if this helps anyone outhere but jiffy mix comes prepared in a formula thats within 60/40-50/50 range and its buffered.. ive also used ferry morse seed starter at a rate of about 2 cups seed starter to 1 - 1 1/2 cups vermiculite which worked well also..


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Edited by evildee125 (10/19/09 05:42 PM)


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