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Just learned about the concept of "green manure" - a mix of cover crops that can be grown and then mowed and either tilled into the soil or laid on top as a mulch. They can improve the quality of the soil by fixing nitrogen, aerating it with deep, penetrating roots, converting the chemicals in the soil into more available forms, providing home for beneficial insects, etc
A lot of these plants can be planted over the winter in plots where you don't have anything growing, and I imagine this would work well with other #permaculture techniques like Ruth Stout, lasagna gardening, hugelkultur, or maybe even straw bale gardening if it's gathered and bound together
https://en.wikipedia.org/wiki/Green_manure https://www.youtube.com/watch?v=N9b9oTZ7EK8
@socalledunitedstates I was just learning yesterday one of the crops people use for this is daikon radish because they have deep taproots that break up soil.