From tipical calcium phosphates (mono, di and tri), some fluorides and fluosilicates to struvite, silicates and other phosphate or mixed salts could potentially be used as fertilizers...
You have to control toxicity, that is variable for soils, crop and its age, etc.
It is not simple, but will pay its research some day in some place.
Beside well stablished usages, new ones will appear.
It is a matter of time!
Time will tell!
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