I'm way late to the party.
Awhile ago I cooked rice after watching the video on youtube how to harvest microbes.
I had some water salable mycorrhizae powder I use in the garden.
Indoors I used newspaper. Mixed mycorrhizae powder into the rice and spread the rice (1 inch thick) and coverd it with a sheet of newspaper. I kept the newspaper damp for 10 days and the mycorrhizae growth was awesome!!!
I broke the rice into chunks and dug them in under my avocado trees 3 inches deep. Now when n dig under the mulch (cow manure/wood chips) there is n crazy mycorrhizae bomb going on in my soil!!!