“the RPM system is composed of three applications that all lead to the enhanced root-mass of a plant. The first is a 12-step air-pruning process. During this process, the taproot of a plant is exposed to air, and eventually dies off. Then, several lateral roots take the place of the single taproot.
The next application to the RPM process is the bacterial fungi mycorrhizae. Mycorrhizae is a symbiotic fungi that helps the root system of a plant absorb the nutrients of a plant.
The third application of the RPM process is the soil-less media found in the containers of the plants. Pine bark, rice hulls, sand, and a wetting agent, are all used in place of soil. This allows more airspace in the container, said Lovelace, which allows for the development of a larger root system.“
This doesn’t sound significantly different from what many people on this forum are doing: air root pruning containers and soilless free draining medium. I dont know about the specific species of fungus used here but I know my soil has fungus in it because I see mushrooms in the pots sometimes, and my recycled soil that I mix in is clearly moldy