I have been working with many different substrate and agar formulations. I was wondering if anyone tries to mimic their substrate composition to some extent in their agar recipe. For example, if you intend to grow on horse manure, water from steeped manure could be use as the base for the agar recipe. Likewise if you intend to grow a species on hardwood, then the water drained from soaked woodchips/wood pellets could be incorporated. Same with grains (use grain soak water from the grain you intend to inoculate).
The logic to doing this would be to select for mycelium that will grow well on the intended substrate. I'm not sure if this would actually make a difference, but I wanted to throw the idea out there to see if anyone has really played around with this. Thanks!