I've been reading a lot about Terra Pretta and I have to say it's fascinating. I remember as a kid 'playing' at gardens and 'fertilising' our little crops with ash because that's what we had. I remember the peas doing pretty well.
In any case, I'm giving this a go again. Spent the morning collecting the bounties left from our Spring Equinox bonfire - plenty of ash, bits of clay, and lots of charcoal. Have mushed it up and mixed it with Green Life Soil company's veggie mix (manure, compost, minerals etc), then dug it in with a trowel in pockets through the beds. If it's all it's cracked up to be, the fertility of our soil should show marked improvement over the next few years. Which would be nice, as despite the amendments we made last season, a hot, dry season has seen it all disappear. Looking forward to seeing this through. :)