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OfflineJohn in WI
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Egg shells for calcium carbonate?
    #26564613 - 03/29/20 06:55 AM (3 years, 9 months ago)

Normally, I would just buy some calcium carbonate or chalk and leave it at that.  But in the middle of the pandemic, I just don't have a source!

I do have 18 egg shells, and I also know they are about 95% calcium carbonate.  Normally I crunch them up and use them when I plant tomatoes.  I'm wondering if I need to try and remove the membranes, so I can use them for mushroom growing, or if I can just dry and crush them and use it directly?  I'm a little concerned about the protein membranes in there.  Out in the soil or in compost it isn't a big deal, but indoors, in shoeboxes, I don't want it being a vector for contamination.

Any thoughts?
Thanks!


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Offlineantmanmax
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Re: Egg shells for calcium carbonate? [Re: John in WI]
    #26564688 - 03/29/20 07:46 AM (3 years, 9 months ago)

What do you need to use chalk for?


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Onlinerumfor69
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Re: Egg shells for calcium carbonate? [Re: antmanmax]
    #26564734 - 03/29/20 08:04 AM (3 years, 9 months ago)

If you have your heart set on getting using calcium I think you can just
boil the eggshells and use the water


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Invisiblenosf3r4tu

Registered: 03/26/19
Posts: 775
Re: Egg shells for calcium carbonate? [Re: John in WI]
    #26565365 - 03/29/20 02:03 PM (3 years, 9 months ago)

I don't know but I have about 1/2kg of crushed egg shells that I saved for the garden and I was also thinking about using them for mushrooms.
I'm commenting to save this thread.


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Invisiblenosf3r4tu

Registered: 03/26/19
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Re: Egg shells for calcium carbonate? [Re: nosf3r4tu]
    #26565373 - 03/29/20 02:08 PM (3 years, 9 months ago)



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OfflineJohn in WI
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Re: Egg shells for calcium carbonate? [Re: antmanmax]
    #26565634 - 03/29/20 04:04 PM (3 years, 9 months ago)

I'm using a peat-based casing layer, and peat is fairly acidic.  The recipe/tek called for lime (which I have) and calcium carbonate, which I do not have.  Egg shell is around 95% calcium carbonate, with some magnesium carbonate and magnesium phosphate in there too.    Lime is most calcium oxide and calcium hydroxide--both much stronger bases than CaCO3.    Anyway, the calcium carbonate is there just as a kind of buffer.  Maybe a little bit for nutrition


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OfflineJohn in WI
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Re: Egg shells for calcium carbonate? [Re: nosf3r4tu]
    #26565644 - 03/29/20 04:09 PM (3 years, 9 months ago)

I just did 6 shoeboxes. 3 with and 3 without.  I put the egg shells in an air fryer, and roasted them at 250 for several minutes.  Crunched them up, and roasted them some more, etc, until the membranes started to turn brown from heat and the shells were really dry.  Then I crunched them up in a pyrex bowl using the bottom of a bottle to really smash it into powder (a coffee mill would probably be better).  The SHELL part I know is fine, it's the membrane I'm concerned with.  But it's roasted at high temp--as of now it'sterile.  We'll see if anything happens--if the yields are different, if these contaminate worse, etc.  I have no idea.  I would prefer to just buy some calcium carbonate, but in the middle of a pandemic, good luck with any kind of shopping!!    It does work great for tomatoes though--that calcium helps blossom end rot.


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Invisiblenosf3r4tu

Registered: 03/26/19
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Re: Egg shells for calcium carbonate? [Re: John in WI]
    #26566210 - 03/29/20 11:26 PM (3 years, 9 months ago)

I remember reading about a month ago on mycotopia a discusion about lime vs calcium carbonate and the bottom line was that with adding lime it can get to basic if you dont hav3 a ph metter to test (its's potency varies depending on the source) where as with calcium carbonate you can't go over ph 8 no matter how much you add. If I remember corectly that's because it's not soluble or something like that. 
But the baking part of the egg shells seams very important to be safe if you want to consume your mushrooms.
I'm curious about your results with this grow. Please post an update here when it's done.


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OfflinecronicrFacebook
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Re: Egg shells for calcium carbonate? [Re: nosf3r4tu]
    #26566243 - 03/29/20 11:48 PM (3 years, 9 months ago)

the CC will help swings in your ph as your casing layer colonizes


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OfflineJohn in WI
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Re: Egg shells for calcium carbonate? [Re: cronicr]
    #26566582 - 03/30/20 05:45 AM (3 years, 9 months ago)

Indeed---This is some good acid/base chemistry.  Carbonate ions are good for this--carbonates are not soluble at nuetral pH's.  But in acidic pH's, the carbonate ions (CO3 2-) react for form CO2, which floats away, and water. 

Since it's not soluble, and doesn't dissociate at nuetral pH, it should not have an effect on the pH until the number gets down below 7, where it starts reacting.


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