Keith - I started off by digging out about a foot or so of the subsoil and disposing of it in order to make room for the stuff I added. I fully expect a big part of the spent mushroom substrate to leach out and I know I'll be adding organic matter forever if I want to have good soil. I'm composting more of the stuff mixed with leaves and kitchen waste to add between plantings. I also mulch every crop with about 4" of shredded leaves most of which goes into the soil during the growing cycle.
Thanks for the Greening the Desert video tip. I had not seen it -- interesting.
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Jerry - You only get old if you're lucky.
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