Soil compost and renew

How to gain fertile soil in the first place? Saying fertile, I mean solid structure with pores allow air flow in and elements sound. And how to renew and maintain the fertility with limited pestisides/herbisides ?

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Could a fixture be added or adapted to aerate the soil? For example, a kind of trowel/fork attachment for the FB that allows it to be inserted in the soil and rotated to loosen it? Potential struggle with clumps of soil, but if the process was repeated two or three times and with varying positions it could compensate?