Nearly every fertilizer which is stored and handled in bulk is prone to caking. Everybody active in the fertilizer business has seen examples of massive lumps. One of the causes of caking is that salt bridges between the fertilizer particles are being formed due to humidity cycles or migration of moisture present internally in the fertilizer. This can be solved by using coatings, talcum powder or other additive that form a protective layer around the particles and thus reduce the interaction between particles (Figure 1). A good anticaking treatment should minimally give 90+% caking reduction compared to untreated fertilizer.