I know this is a slightly older thread, but had some thoughts.
While growing your own mycorrhizal fungi spores seems a bit too involved, growing pure-ish cultures of useful bacteria like Bacillus subtilis or Streptomyces lydicus should be pretty easy.
You'd basically use the same 5 gallon bucket setup people use for compost tea, but without the compost. Instead you fill the bucket with a nutrient solution and inoculate it with the product.
The nutrient solution should be very, very dilute, and might vary depending on what you're culturing. Fish emulsion and seaweed should work as an all purpose nutrient source though. You could add small amounts of powdered chitin (crabshells) or beta-glucan (mushrooms, oats) to promote the production of antifungal compounds, like chitinases and beta-glucanases.
You'd have to inoculate with the commercial product each time.. I don't think you could successfully keep a small amount of the culture to inoculate the next one. The purity would be too low, and eventually you'd be culturing who knows what.
Could this be illegal? This would just be for personal use of course.
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