I use a no dig method but with a couple of very important twists that seem to do wonders for my garden. First when I create new space, raised bed, I do turn soil because where I live near Atlanta, GA our soil is pure gray clay with removed top soil which requires a lot of soil amendment. When I do turn the soil I amend it with composted leaves, pickled weeds that I pull by hand around my garden. Pickled weeds are brined in a water solution mixed with Epsom Salt. Let it sit for 3 days and then the stinky layer goes into the deep layer of the raised that instantly eliminates the odor, activates the flora in the soil. It's followed by native soil mixed in with sand and layer of ready made compost. The top layer is composted wood chips. I prefer aromatic cedar mulch that keeps pests away. For 2-3 years the bed is a high yield producing bed and I have even managed to grow nightshades plants in the same bed for several years which anyone who grows food in the South knows given our high humidity nightshades quickly attract fungal issues that quickly destroy crops. So from the initial soil amendment, I don't disturb the soil again. Annual amendment of a layer mulched tree leaves, mowed pesticide free grass and compost for next planting continues to build the soil fertility.
Another twist. After several years of no digging/turning soil, you do run a risk of allowing fungal spores, pests taking hold in your raised bed. That's when I deploy the ancient trick of making terra preta, creating bio char on site. A lot of people make bio char in a chimney. I prefer to create bio char in the same raised bed that I grow food. Piling up dry branches I make fire and then cover up with soil/sand to cut down the oxygen level. Next day the bed is ready again for the next 2-3 years without a danger of fungal attacks on my plants. The bio char cooked on the site quickly restores the vitality of the micro flora in the bed and now you have additional mineral elements increasing your bed fertility. Amazon has been functioning like this for thousands of years with great results so why not to utilize the same concept.
