We're using Korean Farming Technique http://www.bioponica.org/enhancing-fertility-with-microbes to colonize microbes for our soilless grow beds. Bacteria and fungi can be sourced from earth underling old growth hardwoods and within bamboo root systems. Start process by seeding hard boiled rice then transfer to dry molasses tub and store as putty. Then sprinkle onto grow media. Between that and homemade organic hydroponic liquid fertilizers we're colonizing some bad ass bugs. Worms love the environment too, keeping bad bugs at bay and seeding with whatever they grow in their guts.