Solubility of...(fertilizer)
I found a thing of bulb fertilizer in the basement, I forget the rating offhand but it contains AN, calcium phosphate, potassium phosphate and
potassium sulfate. I ground some down (since it's coated in some shell ("Osmocote" that slows it down to oh four months dissolution time), oh and it cools the solution nicely when dissolved, as
I'd expect,  well anyway I decanted off the insolubles (non-broken-down
shells and calcium phosphate), boiled the solution a little and then froze it.
It was probably 10-20°F, cold enough that frost formed on it. Some nice long crystals formed, on decanting and drying (during drying, the little
water left by capillary action dissolved it totally at 212°F) I crushed some with charcoal and it burned slowly with a purple flame, hmmm potassium
nitrate 
Long story short (oops, the above is long, so much for that), which of the ions are least soluble, and how much does it vary with temperature?
Obviously, I already got some KNO3 from it, but what of the phosphate, sulfate and ammonium (and any remaining nitrate) in solution?
More succinctly, how can I refine this into the component phases, and what will I get?
Tim
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