taking this a bit further....
Is this "P" sensitivity simply because the plant has no biological reason to form this symbiotic relationship in conditions where nutrients are adequate?
It seems like mycorrhizae inoculation is particularly beneficial in container mixes (i.e. sterilized mixes) and on less than ideal soils. I'd be interested in evaluations of mycorrhizae inoculation on very good, biologically active soils. Is there marked improvement in quality and yield?
On a side note, now that the probiotic market is gaining traction, I see some evidence of mycorrhizae being marketed as a "cure all." I was at the garden center yesterday and saw a bag of blueberry/azalea/rhododendron fertilizer (major brand) with added endo/ecto mycorrhizae. These are among that 5% of plants which have shown no response whatsoever to endo/ecto mycorrhizae.
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