Which phosphates are soluble

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Pure phosphoric acid is a solid that melts at 42C. Triple Superphosphate : The active ingredient is calcium monophosphate, as in the single superphosphate, but the product carries less gypsum content because it was made with phosphoric acid instead of sulfuric acid:. It was the most popular P fertilizer until surpassed in usage by ammonium phosphates. Much of the gypsum generated as a byproduct is diverted into construction. Formulated by reacting various quantities of ammonia with phosphoric acid.

More often regarded as P fertilizer than N fertilizer since fertilizer application of DAP to achieve desired N rates exceeds usual P rates, in most cases. Completely water-soluble P. Superphosphoric acid : A phosphoric acid mixture containing a substantial proportion of one or more polyphosphoric acids pyrophosphoric acid, H 4 P 2 O 7 ; tripyrophosphoric acid, H 5 P 3 O 10 ; tetrapyrophosphoric acid, H 6 P 4 O Manufactured by "roasting" phosphoric acid to remove some water, thereby polymerizing two or more phosphates.

The product is very water-soluble, and has the capability to chelate some micronutrients, such as Fe and Zn. Organic sources of P: The very same sources of organic N mentioned previously, for example, manure, whey, sludge, etc. The use of organic sources as both N and P sources is sometimes problematic because the amount required to meet N needs may also add P far in excess of crop needs; the extra P in the top soil may increase the hazard of P runoff to surface waters.

Other so-called "organic" P sources are bonemeal, in which the active P ingredient is closely related to a carbonatic rock phosphate, and rock phosphate which is not really organic at all.