CRH is the atmosphere humidity at which the fertilizer
begins to absorb moisture significantly.
For hygroscopic fertilizers, the CRH is low.
As a result of the high moisture absorption, the physical properties of fertilizers are modified, such as:
Decrease of granule resistance, color change,
caking formation and increase of fertilizer dust.
The product is sprayed on the surface of the granular fertilizer to create a protection against moisture absorption and incompatibility between fertilizer mixtures.