Mycorrhizal fungi

Has any one had experience of applying Mycorrhizal fungi to a tree already established in a pot? I have a number of pines which were repotted last year and they are simply not moving fast enough for me. I have been reading about the importance of having Mycorrhizal fungi around the root system, but all the products that I have been able to find, are for trees planted in the ground, and talk about sprinkling the dry mix granules into the base of the hole before planting the tree. I have read about the importance of getting the granules into contact with the roots and wondered wether anyone has experience of applying the Mycorrhizal fungi to a bonsai. I have notice that some of these products are sold as a gel and wondered about "injecting" the gel into the soil. Has anyone used these products ? how are they applied to bonsai ? Are they any good ?

I haven't used any of these gel products but, I do know that you can buy mushroom soils that still contain cultures in them. You can mix them right into your soil. I have grown my own mushrooms in plastic bins and then used the solid that way. Cultures are easily obtained via the web. Hope this helps a bit.