I really like Steve Solomon for his knowledge of plants and gardening, but not so much his use of such a 'necessary' mix of amendments. I was shocked when reading his books that it basically came down to this. People have gardened for thousands of years without his magic formula, and have done so successfully because they have created methods that incorporate what they have locally, or they can easily obtain regionally.
If you have a lot of wood ash, you can dust it into your garden
if it needs it (meaning you have acidic ph and would like to neutralize it a bit).
I have a friend who has a successful nursery business and he uses a similar formula to Solomon's for his bedding plants. He incorporates on a very small amount of ash from his woodstove in his mix.
I have another friend who sells her plants on a smaller scale with just
compost and sand in her pots When I get her plants, they often come with worms and these plants thrive in my soil, whereas the other friend's plants are hit and miss, even with his large nursery business success.
"Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has."-Margaret Mead "The only thing worse than being blind, is having sight but no vision."-Helen Keller