The foliage pro is good. Better than any 3-part series. Keep it diluted at about 1/3 strength for that 9-3-6 formula. The calcium in that product is the magic. You'll be supplementing calcium with any multi-part weed nutrients. Many of those products are cheap, and meant to turn a quick profit - but they do so at the expense of user friendliness. It's very hard to keep calcium in solution with other nutrients, as they have a tendency to bind with one another. The only products that I've seen on the market that have the proven know-how to deliver an effective 1-part solution, are DynaGrow FoliagePro and Botanicare CNS-17. (which a few around here know that I absolutely swear by)
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As for sequestration of phosphorus... That's not the most likely outcome, unless you have a fairly insoluble form of phosphorus. Phosphorus and phosphates have more of a tendency to wash down into the sub-strata, and ground water. (depending on what type of soil you have) Farmers will over-apply phosphorus, as its use in tilled soil is very inefficient, and soil Ph isn't always immediately in the target, so the phosphorus won't get used until that condition is met, anyway. There is a high rate of loss. And tilling soil does that no favors.
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Miracle-Gro will always require calcium supplementation, and Dyna-Gro 7-9-5 is a pretty wild ratio, but it will work fine, if you just cut it in half, and understand that the 9 and 5 are more than you'll ever need when supplying nutrients in a readily available state. Next season, though, check out the CNS-17 Grow.