My friend, spiking and layering are not part of commercial horticulture at all. A great deal of TLO isn't done or followed by commercial horticulture. I'm afraid these ingredients and techniques are restricted to the weed forums... Don't bother looking it up on my behalf. I have several contacts at the U of MI Soil Science department, as well as the Oregon Tilth. These guys and gals are at THE cutting edge of soil science and research.
Again, I read Rev's book.
Look, we're all growing weed, and if someone wants to follow ED, SubCool, The Rev, etc, that's just dandy. You'll enjoy your weed in any event. I'll bow out, as I've said my piece and I'd only be repeating myself, and this is the TLO thread, and I'll respect that.
Peace-