whats exactly are the digestive enzymes that they talk about it the article?
heres a great link to a beneficial bacteria thread. i just found it today, and learned a TON
https://www.rollitup.org/dwc-bubbleponics/361430-how-breed-your-own-beneficial.html
enzymes r basically "juices" that a bacteria secrets. these enzymes break down organic materials(leaves, dead roots, soil nutes, etc) into the basic building blocks that the plant needs to survive. when in soil, the enzymes break it all down, then those basic nutrients can be dissolved into water. the plants roots can then suck it all up, together with the water.
there is a symbiosis among the plant and the bacteria(in soil). the plant will detect the bacteria there, and in turn bring sugars down to the root system. the bacteria use these sugars to survive on, and enable them to break down more material for the plant. hence, symbiosis...
*if the bacteria arent there, but basic nutes are(in hydro for instance), i dont think the plant brings sugars down to the roots. i dont remember reading about this, but i would think it is true. i dont believe a plant would waste energy like that.)
edit: im drunk, so sorry if that didnt make any sense lol i just learned it today so bear with me