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.