Originally Posted by Smallaxe
How deep are the fungi able to generate nutrients through decay? and What happens after the OM in the depths of the soil is decayed and gone?
When I inject mycorrhizae , I do so about 12" deep and the mix comes up.
When I am planting, I add a dry mix to the top 8 to 12" of the backfill. More and more reputable growers are now inoculating as well.
I mostly apply rhizobia in a nice mix of macro, micro nutrients, seaweed humate, yucca extracts and sugars to the lawn but the trees will respond too if you inject it in the top few inches.
It takes time for sure since most track homes have all the top soil stripped away, and compacted by construction. Aeration and top dressing helps speed it a long.