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totenkopf
Less Newbie !


Registered: 10/24/10
Posts: 229
Loc: Inside your mind
Last seen: 11 years, 6 months
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Rush help: Quantity of gypsum.. normal ?
#13726042 - 01/03/11 05:42 PM (13 years, 1 month ago) |
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Hi, I'm actually doing my substrate mix following the ProfessorPinhead recipe.
He's saying to use 10% of gypsum per weight.
Main recipe:
60% Hpoo 40% coir
Plus add from that 100% (60+40) 10% of verm and an other 10% of gypsum.
IT MAKES A LOT
My actual mix contain:
27 liter of Hpoo 18 Liter of coir ----------------- total : 45 liters
45 X 10% / 100 = 4.5 liter OF GYPSUM !!!!!
That's a lot..no ?
-------------------- One baby foot step at a time, learning to crawl before thinking to jump one day !
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hamloaf
Pork Block



Registered: 12/23/09
Posts: 20,453
Loc: Oklahoma.
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Re: Rush help: Quantity of gypsum.. normal ? [Re: totenkopf]
#13726067 - 01/03/11 05:46 PM (13 years, 1 month ago) |
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Quote:
totenkopf said: Hi, I'm actually doing my substrate mix following the ProfessorPinhead recipe.
He's saying to use 10% of gypsum per weight.
Main recipe:
60% Hpoo 40% coir
Plus add from that 100% (60+40) 10% of verm and an other 10% of gypsum.
IT MAKES A LOT
My actual mix contain:
27 liter of Hpoo 18 Liter of coir ----------------- total : 45 liters
45 X 10% / 100 = 4.5 liter OF GYPSUM !!!!!
That's a lot..no ?
10 percent of 45 liters is 4.5 liters correct. I'd cut that in half and add 5% percent gypsum by volume instead of the whopping 10% 5% of 45 liters is 2.25 liters.
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RogerRabbit
Bans for Pleasure



Registered: 03/26/03
Posts: 42,214
Loc: Seattle
Last seen: 1 year, 4 days
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Re: Rush help: Quantity of gypsum.. normal ? [Re: hamloaf]
#13726120 - 01/03/11 05:54 PM (13 years, 1 month ago) |
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Gypsum is very heavy, so ten percent by weight is WAY too much. I used to recommend ten percent by volume, but I've found that 2% to 5% gypsum by volume gives the same performance. 5% gypsum by volume is roughly 2% by weight. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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totenkopf
Less Newbie !


Registered: 10/24/10
Posts: 229
Loc: Inside your mind
Last seen: 11 years, 6 months
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Re: Rush help: Quantity of gypsum.. normal ? [Re: RogerRabbit]
#13726249 - 01/03/11 06:15 PM (13 years, 1 month ago) |
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ah... It look more realist !
So with an amount of 45 liter, 2.5 liter of dry dust gypsum look correct ?
I'm asking just to be sure cause it makes me crazy the way they calculate WEIGHT + Volume + Quart to get a correct answer !!!!
Use only weight or volume or quart,,, but not all of them into the same formula !
Is it only me that become lost with that kind of calculation ????
-------------------- One baby foot step at a time, learning to crawl before thinking to jump one day !
Edited by totenkopf (01/03/11 06:16 PM)
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hamloaf
Pork Block



Registered: 12/23/09
Posts: 20,453
Loc: Oklahoma.
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Re: Rush help: Quantity of gypsum.. normal ? [Re: totenkopf]
#13726299 - 01/03/11 06:24 PM (13 years, 1 month ago) |
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2.5 liters of gypsum is 5% of gypsum by volume of 45 liters like I stated above. Just measure out 2.5 liters of powderized gypsum in a measuring cup and add it to your dry substrate materials. Add your gypsum to your materials before bringing them to field capacity and pasteurizing them.
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totenkopf
Less Newbie !


Registered: 10/24/10
Posts: 229
Loc: Inside your mind
Last seen: 11 years, 6 months
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Re: Rush help: Quantity of gypsum.. normal ? [Re: hamloaf]
#13726336 - 01/03/11 06:32 PM (13 years, 1 month ago) |
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THANKS TO BOTH OF YOU for the fast replies !
I could continue my mix
-------------------- One baby foot step at a time, learning to crawl before thinking to jump one day !
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