Great thoughts above.
I use osmocote and epsoma and worm castings. Organic fertilizers often use up nitrogen first before adding it back and more. So they can actually make your soil nitrogen deficient for a while, the same as if you have a wood chip based soil. That's why I never use them alone. Osmocote and miracle grow will not kill your soil microbes. If a plant looks pale I'll give it some miracle grow and ironite. Pine bark produces a soil high in calcium so I don't worry about that.