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Bruce Drukker wrote:My soil is decomposed granite which drains incredibly fast. To counter this, I'll be building some hugel beds, but rather than pile the wood on the surface, I'll be burying it a couple of feet deep. Before backfilling however, I would like enrich the DG with some organic matter. I have an unlimited supply of free "Spent Mushroom Substrate" or mushroom compost as some people call it from a local producer. I would also like to add some biochar to this mix. Is there anything nefarious about SMS? The supplier is not organic, but the list of ingredients seems fairly innocuous. Also, I am not sure what the ratio of DG to SMS should be. I generally use 5 gal. buckets and dump them in a wheelbarrow for mixing. I would like to premix the compost with bio char before adding it to the DG, so a ratio of BC to SMS would be helpful also. Thanks for reading!
Milo Jones wrote:
Bruce Drukker wrote:
Well, I read somewhere on this forum that it was mercury. This is what raised my initial concern. I'm hoping the biochar will help with that.
There is no mercury involved in commercial mushroom production. When I worked in the industry 30 years ago the only sterilization involved was a 6 hour steam treatment to bring the substrate to 160 degrees F before cooling and inoculation.