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 ology
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 Can Perilite substitue for Vermiculite? 
#5047801 - 12/11/05 10:11 AM (6 years, 5 months ago) |
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I was wondering if you can use Perilite instead of Vermiculite in rye jars to act as a moisture equalizer? Thanks for any advice you can offer?
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 Psychoslut
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Re: Can Perilite substitue for Vermiculite? [Re: ology]
#5047806 - 12/11/05 10:12 AM (6 years, 5 months ago) |
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no
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[quote]KristiMidocean said:
Good now thats clear.WHO FUCKING CARES. If I am fat u all keep pointing it out like its suppose to be a secret.LIke u really have nothing better to do then make fat jokes. If o know its like I do I know yall can come up with NEW AND BETTER SHIT . This shit is old and boring . I left in the first place cause this shit got boring not because of the fat jokes . Fat jokes dont bother me but seriously its old[/quote]
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meehi
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Re: Can Perilite substitue for Vermiculite? [Re: Psychoslut]
#5047824 - 12/11/05 10:20 AM (6 years, 5 months ago) |
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Yea it's a no.
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OJK
Stranger
Registered: 06/08/03
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Re: Can Perilite substitue for Vermiculite? [Re: ology]
#5047829 - 12/11/05 10:22 AM (6 years, 5 months ago) |
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Actually, yes you can, but the loss in overall growth makes it only advisable when it is impossible or near-impossible to get vermiculite.
Perlite releases moisture - that's why it's used to raise relative humidity. Vermiculite absorbs and holds moisture - that's why it's used in pf cakes.
However, experiments in the past have shown that it is possible to grow and fruit perlite pf cakes successfully - although getting much, much lower yields and success rates than with standard pf cakes.
Because perlite doesn't hold moisture well at all, and is used simply to provide a good structure, it might be better to substitute the vermiculite with something such as shredded cardboard, or similar, if vermiculite proves impossible to obtain.
However, this is all more or less arbitrary, as anywhere you can get perlite, you can pretty much get vermiculite too, if you look hard enough.
Growing perlite pf cakes is not to be recommended to anyone. If you've having difficulty getting vermiculite, try looking around local garden centers, pet shops (where it's sold as a reptile bedding and humidifier) and hydroponic stores, or try buying online, from one of the shroomery sponsors.
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Psychoslut
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Re: Can Perilite substitue for Vermiculite? [Re: OJK]
#5047863 - 12/11/05 10:38 AM (6 years, 5 months ago) |
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he has the internet, he can get almost anything shipped to his front door if he trys hard enough
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[quote]KristiMidocean said:
Good now thats clear.WHO FUCKING CARES. If I am fat u all keep pointing it out like its suppose to be a secret.LIke u really have nothing better to do then make fat jokes. If o know its like I do I know yall can come up with NEW AND BETTER SHIT . This shit is old and boring . I left in the first place cause this shit got boring not because of the fat jokes . Fat jokes dont bother me but seriously its old[/quote]
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Anno
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Re: Can Perilite substitue for Vermiculite? [Re: OJK]
#5047873 - 12/11/05 10:41 AM (6 years, 5 months ago) |
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>Perlite releases moisture - that's why it's used to raise relative humidity. >Vermiculite absorbs and holds moisture - that's why it's used in pf cakes.
In order for perlite to RELEASE mositure, it has to absorb or adsorb moisture first, or?
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ology
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Re: Can Perilite substitue for Vermiculite? [Re: Anno]
#5047901 - 12/11/05 10:52 AM (6 years, 5 months ago) |
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Thanks I will be sure to pick some vermiculite up
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OJK
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Re: Can Perilite substitue for Vermiculite? [Re: Anno]
#5047902 - 12/11/05 10:52 AM (6 years, 5 months ago) |
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"Perlite and vermiculite both absorb and hold moisture. Perlite releases moisture at a rate substantially faster than vermiculite. For this reason, if the aim is to hold moisture, vermiculite should be used, and if the aim is to release moisture, perlite should be used, although both substances are essentially performing the same task at different speeds."
Doesn't that seem a little unnecessarily wordy?
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OJK
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Re: Can Perilite substitue for Vermiculite? [Re: Anno]
#5047934 - 12/11/05 11:01 AM (6 years, 5 months ago) |
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Wow, thanks for pointing out the difference between absorb and adsorb - I wasn't familiar with that distinction.
Does perlite absorb or adsorb?
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bongtoke
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Re: Can Perilite substitue for Vermiculite? [Re: OJK]
#5047935 - 12/11/05 11:01 AM (6 years, 5 months ago) |
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its really hard to find course verm at this season...all you can find is the fine powder kind unless you order it off of the net..but that a pain in the arse..so i use the powder vrm and coco coir as cakes  it workin
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GOTTA LOVE POO CAKES!!!
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Anno
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Re: Can Perilite substitue for Vermiculite? [Re: OJK]
#5047972 - 12/11/05 11:10 AM (6 years, 5 months ago) |
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>Does perlite absorb or adsorb?
I don't know.
This page
http://www.schundler.com/biotech.htm
says:
"Expanded perlite is physically stable and chemically inert. The porous nature of the cellular granules ensures a product that is light to handle, holds large quantities of readily available moisture and has a strong capillary attraction for water. Since it is free draining, it is also well aerated."
and
"Perlite's strong capillary attraction for water automatically draws up water from the reservoirs at the same rate as it is lost by evapotranspiration, irrespective of weather conditions or stage of crop growth."
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ology
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Re: Can Perilite substitue for Vermiculite? [Re: Anno]
#5047999 - 12/11/05 11:15 AM (6 years, 5 months ago) |
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Another question if anyone has an answer-- Is it possible to use wide-mouth pint jars instead of wide-mouth half-pint jars for the pf technique if half-pint mason jars are not avaliable?
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Anno
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Re: Can Perilite substitue for Vermiculite? [Re: Anno]
#5048056 - 12/11/05 11:27 AM (6 years, 5 months ago) |
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It is possible, but the colonization time will be longer.
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ShroomArtist84
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Re: Can Perilite substitue for Vermiculite? [Re: Anno]
#5048286 - 12/11/05 12:31 PM (6 years, 5 months ago) |
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nope not happening.
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No matter what I say and no matter what I write here.
I'm sick of always looking at this page with a blank stare.
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Anno
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Re: Can Perilite substitue for Vermiculite? [Re: ShroomArtist84]
#5052021 - 12/12/05 10:51 AM (6 years, 5 months ago) |
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Nope not happening what?
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Anno
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Re: Can Perilite substitue for Vermiculite? [Re: ology]
#5097253 - 12/23/05 08:17 AM (6 years, 5 months ago) |
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Since I didn't have any perlite at home, agar was so kind (thank you again!) to determine how vermiculite and perlite defer in their water absorption ability.
He soaked each 1 cup of medium grade perlite and vermiculite in water for 5 minutes, then drained for 5 minutes.
It turns out that perlite absorbs 1.14 times its weight in water, whereas vermiculite absorbs 3.54 times its weight in water.
This means that vermiculite absorbs ~3 times as much water per weight as perlite.
Taking volume as basis, vermiculite absorbs ~2.2 times as much water per volume as perlite.
Here are the images of the process(the scale weighs in oz):
 
 
 
 
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xxanxx
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Re: Can Perilite substitue for Vermiculite? [Re: Anno]
#5097331 - 12/23/05 08:59 AM (6 years, 5 months ago) |
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I have a question -
Can you use Vermiculite in place of perlite in the bottom of a FC for PF cakes?
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"The music business is a cruel and shallow money trench, a long plastic hallway where thieves and pimps run free, and good men die like dogs. There's also a negative side."
-Hunter S. Thompson, RIP
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FooMan
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Re: Can Perilite substitue for Vermiculite? [Re: xxanxx]
#5097571 - 12/23/05 10:28 AM (6 years, 5 months ago) |
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You could just spray water at the bottom of your FC by itself if you don't have perlite. Add peroxide to it to keep things fresh. Oh, and raise the cakes off of the bottom of the FC.
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