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I read that there are hundreds of animals that life in a healthy soil. I've seen only a few and some I know are not helping me grow.

So all I really know is to encourage soil fertility with its diversity of micro-organisms. Some of these are fungi, some bacteria, some insects, and so on.

What I intend is to provide a good home: soil with a good structure, containing nutrients that feed them and allow them to help feed the plants.