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Phosphate as Muscle for Controlling pH.
The buffering capacity of Phosphate salts provides the primary pH control that compensates for the acids and bases generated by Carbon and Nitrogen metabolism. Even though phosphorous is a minor component of living cells, the ability of phosphates to keep soil pH within acceptable limits accounts for why phosphorous has long been recognized as a primary plant nutrient.

In the pH range from 4 to 10, the Phosphate anions exists as an equilibrium of the free acid, H3PO4, the monobasic salt, H2PO4-1, the dibasic salt, HPO4-2, and the tribasic salt, PO4-3. The acid and monobasic salts of Phosphate tend to be soluble, and consequently will readily leach from the soil. On the other hand, the dibasic and tribasic salts will combine with Calcium and Magnesium to make insoluble salts.  Animals exploit this chemistry to make bones and shells.
 

 

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