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Yeah, I have no real idea, but think it is the latter.So on a chemical level do the anaerobic microbes bond O2 molecules to the nutes? or does regular soil biology process it 1 last time before the plants consume it?
In my original SIP builds with my normal organic mix, I used hydroton clay balls to keep the mix out of the water, fearing anaerobic conditions not mixing well with the organics in my mix.
What I got was water roots in that hydroton area but a seeming inability for the plants to take up nutrients that way. I had a nitrogen deficiency and not even my Fish Amino Acid nutes was able to correct it until I fed it to the soil from the top.
In my more recent pot design I put my mix all the way to the bottom of the pot with no apparent problems, so I think the soil microbes must be involved in the action.