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Single superphosphate (SSP)

Single superphosphate (SSP)

Phosphate (SSP) or (OSP) Single Super


This fertilizer is made from the reaction of phosphate rock with sulfuric acid: -


[Ca3 (PO4) 2] 3.CaF2 + 7H2SO4 -----------> 3Ca (H2PO4) 2+ 7 CaSO4 + 2HF


The phosphate rock is finely ground with the appropriate amount and concentration of sulfuric acid (at least 57%). This fertilizer contains 11-22% P2O5 (4.8 - 9.6 P), and it is an excellent source of phosphorus and sulfur (12% S), Despite the low level of phosphorus in it, which determined its use, but it remains a good source of sulfur and phosphorous, but on a limited scale. Reason for non-gypsum formation and non-aqueous calcium sulfate formation. In general, regular superphosphate contains MCP + DCPD + free phosphoric acid. MCP + free phosphoric acid forms about 75 - 90% of phosphorous and the rest 10-25% DCPD and a small amount of TCP