Wood ash and chicken poop sure made the tomatoes grow in a garden I once had. I heard a nutritionist on the radio point out that one of the great “contributors” to the declining strength and vigor of us moderns, as compared to our pioneering ancestors, is the lack of mineral in our modern diet.
Nowadays, industrial farming is done by spreading just enough nutrients (e.g., ammonia) to “goose” the plants into growing large, not necessarily nutritious, but profitable. A generation or two back, when many people heated with wood, they put their ashes on the garden plot, and got the benefit of dietary minerals that many of us would have to buy in supplement pill form. Spreading wood ashes on the garden makes sense to me.
For those where it is available, alfalfa meal, pellets, or cubes, tilled into the soil, can add minerals as well.