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An agronomist's hand holding fertilizer pellets.
Cristie Preston, Ph.D.

When it comes to fertilizer storage, it is crucial for farmers and distribution to be aware of critical relative humidity (CRH) values – the value at which fertilizers begin to absorb moisture from the air – for commonly used fertilizers.

A fertilizer with a high CRH can be stored and handled in humid conditions. Individually stored fertilizers have higher CRH values. Once blended, the CRH decreases. For example, ammonium sulfate blended with urea has a CRH of 56.4 percent, which will result in considerable moisture adsorption at low air humidity.

Refer to this storage and handling sheet for Tips for Preserving High Product Quality of Ammonium Sulfate in Storage.

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