The compatibility of POLY4 is essential since many fertilizers are sold as blends. Incompatible products often result in caking, which is affected by air humidity, particle shape and size, composition, storage duration, temperature and pressure.
Ejection pressure is an indication of the caking propensity for a fertilizer blend. Higher values are indicative of stronger, undesirable cakes that should be avoided. Table 1 provides an evaluation of the caking propensity of NPK 20:10:10 blends from a range of N, P and K sources. As shown below, changing the N source can have a substantial effect on caking propensity. Furthermore, adding POLY4 into blends as a K source shows a reduction in caking propensity.