Relating to bacteria, I've seen greenhouse and farm equipment sold to inject chlorine into the irrigation water. Is the idea in that situation that the bad bacteria must drastically outnumber the good? I would have thought the chlorine would be bad for plants.
And back to the thread topic, I think guano deserves a mention along with rock dust. The mined deposits are petrified and sometimes hundreds of years old. They break down slowly in soil, similar at least to rock dust.
I've used greensand and bat guano before. I want to try being organic next year, which will entail adding rock phosphate and probably azomite as well.
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