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invitro

Registered: 05/03/13
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Grain spawn ratios on Oyster mushrooms
#22189767 - 09/04/15 07:29 PM (8 years, 4 months ago) |
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GMM by Stamets says with pink oysters you want 10-20% grain spawn. In mush cult 50% is frequently used so my question is: what happens with oysters with high spawn ratios? Is it kept low because the heat would build up in the bags? What if I kept the total amount of substrate small (like a quart jar), would higher spawn ratios be possible/desirable?
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mikesethnobotany
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Re: Grain spawn ratios on Oyster mushrooms [Re: invitro]
#22190576 - 09/04/15 10:02 PM (8 years, 4 months ago) |
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the problem is that grain spawn is a source of nutrients
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invitro

Registered: 05/03/13
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Why is that a problem?
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popok
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Re: Grain spawn ratios on Oyster mushrooms [Re: invitro]
#22191442 - 09/05/15 05:20 AM (8 years, 4 months ago) |
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I use 25% wet spawn/dry substrate for all oysters with consistent success. You dont want to use more because grain spawn increases chances of contamination at fructification stage, however sawdust spawn is safer if you want to go this way.
Edited by popok (09/05/15 07:35 AM)
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solarity
mm... my favourite food



Registered: 03/31/09
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Re: Grain spawn ratios on Oyster mushrooms [Re: popok]
#22191534 - 09/05/15 06:35 AM (8 years, 4 months ago) |
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'kin ell! I assume you are talking wet/wet ratios?
I use 3-5% for greys and pinks, 7.5% for yellow. I have gone as low as 2% but I have issues getting an even mix (200kg/batch) so 5% is more reliable. Yellows will not fruit below 7.5%
-------------------- Commercial exotics farmer for 8 years - now sold up!
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invitro

Registered: 05/03/13
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Re: Grain spawn ratios on Oyster mushrooms [Re: solarity]
#22191763 - 09/05/15 08:37 AM (8 years, 4 months ago) |
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I'm trying to wrap my head around what oysters are capable of and how they respond to different grain ratios.
In mush cult, I've used this tek as inspiration in the past http://www.shroomery.org/forums/showflat.php/Number/21168958
He calls for: 7 cups of various grains (dry I assume) 2- cups of vermiculite. 160- grams of coir (1/4 brick) and other minor ingredients
I don't follow this tek exactly I just hydrate grains and coir in different tubs and when they are ready for loading I load the "quart bottles" up at 50% wet grain and 50% wet coir (by volume).
The idea is to get as many fruits per quart of substrate as possible, not to find the cheapest substrate...
So.. If it were possible to fruit from 100% grain I would but the coir provides water and possibly a low-nutrient pinning surface. Whatever the reason, pinning and fruiting is severely stunted on pure grains with actives so coir and verm increase the yield quite a bit.
So with oysters, I get the feeling that the main focus is not on yield per volume unit of substrate but maybe keeping costs low? (correct me if I'm wrong).
What I want to do is understand how yield would be effected for oysters if cost of substrate were no object. I just want to focus on getting the most fruit per quart jar.
I've heard they can handle 100% coffee grounds? How will they respond (yield wise) to 100% grain (like WBS)? 50% grain/50% sawdust (by volume or by weight)?
What I have available right now is WBS and or whole oats for grain. I have hardwood sawdust also. The sawdust I can get in the form of small shavings or I can also get extremely fine dust. I have gypsum in pellet form and a bag of fish meal. I could get raw or spend coffee grounds if needed.
It wouldn't bother me to use 100% grain because I want to deal with as little volume as possible and get the highest amount of fruit, even if it costs more$ per fruit in terms of spending more money on grains.
A yield comparison of low grain spawn ratios like 5-7.5% vs 20% or 50% or 100% would be nice.
Edited by invitro (09/05/15 09:12 AM)
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invitro

Registered: 05/03/13
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Re: Grain spawn ratios on Oyster mushrooms [Re: popok]
#22191817 - 09/05/15 09:00 AM (8 years, 4 months ago) |
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Quote:
popok said: You dont want to use more because grain spawn increases chances of contamination at fructification stage.
I don't know what to make of this statement because of the 100% coffee oyster grows I have seen (Stamets etc.)
Edited by invitro (09/05/15 09:03 AM)
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invitro

Registered: 05/03/13
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Re: Grain spawn ratios on Oyster mushrooms [Re: invitro]
#22191876 - 09/05/15 09:16 AM (8 years, 4 months ago) |
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It may also be worth noting that I am not interested in "spawning to bulk", I just want to load up bottles, PC them and fruit them as is.
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popok
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Re: Grain spawn ratios on Oyster mushrooms [Re: invitro]
#22192309 - 09/05/15 11:47 AM (8 years, 4 months ago) |
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It's not that clear you will get the most yield from 100% grain, I believe grain provide nutrients that maximize mycelium growth, while for fruit body protein (like in bran) are more needed, cellulose and lignin also help. Correct me if I'm wrong. You can try fruiting spawn jars and see for yourself. I wasn't impressed when I tried it a while ago. Now, I do it for strain isolation purpose (to get a clone of a summer fruiting strain). I top the jar with a half-inch of verm/lime casing to keep contamn in check.
There is also other factors than nutrition. Water retention, air penetration, granulometry... I've worked with oyster on hundreds kg of coffee ground, with and without straw and sawdust. 100% coffee didn't maximize yield for me, 50 coffee/50 straw was better.
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drake89
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Re: Grain spawn ratios on Oyster mushrooms [Re: popok]
#22192847 - 09/05/15 01:57 PM (8 years, 4 months ago) |
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OP if you want to do jars just do 50/50 grain or bran and sawdust.
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invitro

Registered: 05/03/13
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Last seen: 1 month, 20 days
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Re: Grain spawn ratios on Oyster mushrooms [Re: drake89]
#22192854 - 09/05/15 01:58 PM (8 years, 4 months ago) |
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Cool thanks
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