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OfflineHotBox420
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Sterilizing casing mix?
    #8534868 - 06/17/08 08:17 PM (12 years, 8 months ago)

I have some Vermiculite, Peat moss and calcium carbonate. I figure I should do 50/50 and add 5% Lime to it. Should I PC the mix before adding the lime, and how long should I PC 1 Quart jar of the mix to make sure its sterile? Thanks

And also, using 2 cups of verm and 2 cups peat moss I will need to use 5% of a total 4 cup mixture? thanks!!


Edited by HotBox420 (06/17/08 08:38 PM)


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OfflineYossarian22
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Re: Sterilizing casing mix? [Re: HotBox420]
    #8534933 - 06/17/08 08:37 PM (12 years, 8 months ago)

You don't want to sterilize it; pasteurize it instead. There are a lot of beneficial bacteria that you want to preserve.


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OfflineHotBox420
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Re: Sterilizing casing mix? [Re: Yossarian22]
    #8534942 - 06/17/08 08:39 PM (12 years, 8 months ago)

So pastuerizing, can you give me a quick method? Could I just cook the quart jar over the stovetop until it comes to a boil and then remove, like RR said? Thanks in advance!


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Invisiblelegallyhomeless
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Re: Sterilizing casing mix? [Re: HotBox420]
    #8535189 - 06/17/08 09:47 PM (12 years, 8 months ago)

http://www.shroomery.org/forums/showflat.php/Number/8447940#8447940

This same method can be used for pasteurizing a casing


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OfflineRogerRabbitM
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Re: Sterilizing casing mix? [Re: legallyhomeless]
    #8535208 - 06/17/08 09:54 PM (12 years, 8 months ago)

When using lime, you only count the peat, not the verm.  If using calcium carbonate, use it at 10% by volume.  Use the same amount of gypsum.  Mix the lime and gypsum together, and then mix with the dry peat before adding moisture.  Lastly, mix in the premoistened verm and make a final adjustment to field capacity before pasteurizing at 140F to 160F for an hour. 

However you chose to go about getting the center of the substrate or casing mix to that temperature for that amount of time will properly pasteurize the material.  Don't sterilize.  Pasteurized peat is fairly resistant to mold infections for several weeks.  Sterilized peat is not.
RR


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Mushrooms, Mycology and Psychedelics >> Mushroom Cultivation

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