SSP is also known as ordinary superphosphate and normal superphosphate. It’s sometimes confused with triple superphosphate (TSP) production, which results from reacting rock phosphate with phosphoric acid.
SSP is an excellent source of three plant nutrients. The P component reacts in soil similarly to other soluble fertilizers.
The presence of both P and sulfur (S) in SSP can offer an agronomic advantage where both of these nutrients are deficient. In agronomic studies where SSP is demonstrated to be superior to other P fertilizers, it’s usually because of the S, Ca (or both) that it contains. When locally available, SSP has found widespread use in fertilizing pastures where both P and S are low. As a source of P alone, SSP often costs more than other, more concentrated fertilizers; therefore it has declined in popularity.
No special agronomic or handling precautions are required for SSP. Its agronomic effectiveness is similar to other dry or liquid phosphate fertilizers.
The loss of P in surface runoff from fertilized fields can contribute to water quality problems. Growers should implement farm practices that minimize this loss.
SSP is primarily used as a crop nutrient source. However, MCP and gypsum (the two primary ingredients in SSP) appear in many products. For example, MCP is commonly added to enrich animal feed, and bakers routinely use it as a leavening agent. Gypsum is widely used in the construction industry, as well as in the food and pharmaceuticals world.