Suståne 5-2-4+Fe is the original Suståne formula first created in 1988. As this was the first Suståne product available on the market, it soon became the standard organic evaluated by numerous universities. Michigan State University, Cornell, University of Rhode Island were three of the first research facilities to discover that Suståne 5-2-4+Fe was highly suppressive of common diseases affecting cool season grasses including root Pythium, Necrotic Ring Spot, Red Thread and to a lesser extent various patch diseases. More organic fertilizer studies have been run utilizing Suståne 5-2-4+Fe as the standard against which all other “organics” are compared.