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Offlinenyashin
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Can I heat the soil in the owen too much?
    #11179726 - 10/04/09 12:49 PM (8 years, 1 month ago)

Hi! I have a newbie question:

I am about to sterelize the soil that I am to use for casing, I have read that I should put it in the oven wrapped in aluminium foil for about one hour in 200 degress celcius.

My question is, can it "damage" the soil if I use to much heat (like 250 degrees) or let the soil be in the oven for too long (like two hours)?


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Re: Can I heat the soil in the owen too much? [Re: nyashin]
    #11179744 - 10/04/09 12:53 PM (8 years, 1 month ago)

define "soil"


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Re: Can I heat the soil in the owen too much? [Re: Slimz]
    #11179824 - 10/04/09 01:08 PM (8 years, 1 month ago)


You really do need to be careful when heating your soil in the owen


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Offlinenyashin
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Re: Can I heat the soil in the owen too much? [Re: Slimz]
    #11185153 - 10/05/09 07:38 AM (8 years, 1 month ago)

>Define soil.

I mean soil you buy in stores to grow flowers in. I think it is called flower soil in english?


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Offlineveda_sticks
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Re: Can I heat the soil in the owen too much? [Re: nyashin]
    #11185200 - 10/05/09 08:03 AM (8 years, 1 month ago)

soil for a casing layer???

casing layers are usually 50/50+. Peat/verm/lime/gypsum. Not potting soil.

Also casing layers, aswell as bulk substrates should be pasturised not sterilised. And the oven is a poor method.

look up pasturisation, you want to pasturise your casing mix in jars in a pot of water. Mantain a core temp of between 140-160f for 1 hour

www.mushroomvideos.com has a video showing how


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Re: Can I heat the soil in the owen too much? [Re: nyashin]
    #11185212 - 10/05/09 08:08 AM (8 years, 1 month ago)

Quote:

nyashin said:
>Define soil.

I mean soil you buy in stores to grow flowers in. I think it is called flower soil in english?




"potting soil"
Some kinds have been used. Miracle Gro Moisture Control has worked well for some people. Also there's Jiffy Mix Seed Starter.
But most people use peat, verm, lime.


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OfflineDelcasa88
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Re: Can I heat the soil in the owen too much? [Re: Doc_T]
    #11185604 - 10/05/09 10:41 AM (8 years, 1 month ago)

One guy here in holland used soil (in dutch: Zaai en stekgrond) speccialy for sprouting seeds (which should be the same as the above mentioned Jiffy Mix Seed Starter). He had great results with it when casing a bulk straw with it and his smaller rye cases.

So yes, it is posible to use soil as a casing.

The oven is mostly used as a tool for pre-sterilization, only as an extra step to make sure its done properly. I think you could do it, and then still pasteurize it like you normally would. More heat; less contams :smile:


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Re: Can I heat the soil in the owen too much? [Re: veda_sticks]
    #11185642 - 10/05/09 10:54 AM (8 years, 1 month ago)

Quote:

veda_sticks said:
soil for a casing layer???

casing layers are usually 50/50+. Peat/verm/lime/gypsum. Not potting soil.

Also casing layers, aswell as bulk substrates should be pasturised not sterilised. And the oven is a poor method.

look up pasturisation, you want to pasturise your casing mix in jars in a pot of water. Mantain a core temp of between 140-160f for 1 hour

www.mushroomvideos.com has a video showing how





oven works just fine..besides its the cleanest , simplest and fastest way to pasteurize, never ever had one single contam so i dont know why everyone dreads this method soo much.


Edited by shangrila (10/05/09 11:01 AM)


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Offlineshangrila
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Re: Can I heat the soil in the owen too much? [Re: Doc_T]
    #11185649 - 10/05/09 10:56 AM (8 years, 1 month ago)

Quote:

Doc_T said:
Quote:

nyashin said:
>Define soil.

I mean soil you buy in stores to grow flowers in. I think it is called flower soil in english?




"potting soil"
Some kinds have been used. Miracle Gro Moisture Control has worked well for some people. Also there's Jiffy Mix Seed Starter.
But most people use peat, verm, lime.





i found tropical soil mix works great and fast, but when it says verm and perlite in the bag, dont count on it you gotta add your own verm cuz their isnt nearly enough.


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OfflineRogerRabbitM
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Re: Can I heat the soil in the owen too much? [Re: shangrila]
    #11185682 - 10/05/09 11:05 AM (8 years, 1 month ago)

Soil mixes were popular 20 to 30 years ago in casing layers.  However, you will have a higher rate of contamination then a plain peat/verm casing that has been buffered with lime, and had gypsum added.  It all depends on the species you're wanting to grow.  Many don't require or benefit from a casing layer.

You 'can' pasteurize in the oven, but it will take much longer.  Put a meat thermometer into the substrate and keep it between 140F and 160F (60C to 70C) for one hour at the center.  Water is a much better heat transfer media than air, so it's generally faster to use hot water pasteurization.
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Offlineshangrila
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Re: Can I heat the soil in the owen too much? [Re: RogerRabbit]
    #11185737 - 10/05/09 11:20 AM (8 years, 1 month ago)

tropical soil mix as bulk not casing layer.  and oven still works so..

oh and oven is 1h 40 mins at 215f


Edited by shangrila (10/05/09 11:22 AM)


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