In retrospect on my last post, I'm guessing I'm over-thinking the mineralization of potting soil. Most of my pots are only active during the growing season and the soil (which I save) is always amended at the beginning of the following year. Dr. Earth vegetable fertilizer does contain some of the majors (other than the obvious NPK) and, with some worm compost thrown in, should suit for my 5-month season.
