As in plaster of paris, right?
How much faster is it to do bulk substrate, from start to flush compared to doing a casing layer type?
i used gyp in my substrate and have used oyster shells in my casing layers... I think oyster shell can be prefered in the casing layer due to it providing a different kind of texture and allows for more air within the casing layer... I don't know the full benefits of using oyster shell opposed to gypsum, only that it is used... I do not use it with regularity and rarely do a casing layer at all since it is not needed with bulk substrates.
Wouldn't it be better and easier to use granulated gypsum? It also works as a pH buffer, but it also dissolves easier over time and has additional minerals mushrooms love.
Now, that is something I can use, mold has creeped in enough of my 1/2 pint jars (inoculation mishap on my part) and during a 3rd flush. I've used a mold isolation polymer (sodium polyacrylate ISP) and good old sunlight with limited success, I'm thinking adding oyster shells will help save me from having to use either next time. thanks again
The biggest benefit, from my perspective, of adding PH buffers like oyster shells is that it helps to stave of contamination... Our lovelies like to grow in a neutral environment when acidity is considered.. Them most common anaerobic competitors prefer acidic substrates... As your mycelium breaks down the nutrients in the substrate, the substrate gradually becomes more acidic.. By adding the oyster shells as a PH buffer, the substrate will remain more alkaline over a longer period of time, allowing your minions to do their thing!
On the other hand, oyster shells would remain in the substrate like small stones, as they do not dissolve.
Don't use Plaster of Paris as its chemical composition allows it to set up and get hard similar to drywall also called gypsum board. Get garden gypsum.
Assuming your talking about simply casing grains you might save a week.......maybe a little longer but you will see a yield loss that is very, very significant.
Edited by Microbe, 23 July 2020 - 05:13 PM.