Urea, a white crystalline solid containing 46% nitrogen, is widely used in the agricultural industry as an animal feed additive and fertilizer Here we discuss it only as a nitrogen fertilizer. Urea (46-0-0) usually has the lowest cost per pound of nitrogen compared to other single-element nitrogen fertilizers.

However, urea undergoes unique chemical transformations when field applied and severe losses in efficiency may result if special management practices are not followed. The purpose of this fact sheet is to briefly describe urea transformations and to suggest how urea-N may be conserved with proper management in the field.

Fertilizer urea can be purchased as prills or as a granulated material. In the past, it was usually produced by dropping liquid urea from a “prilling tower” while drying the product. The prills formed a smaller and softer substance than other materials commonly used in fertilizer blends. Today, though, considerable urea is manufactured as granules. Granules are larger, harder, and more resistant to moisture. As a result, granulated urea has become a more suitable material for fertilizer blends.

NITROGEN: 46% MINIMUM

MOISTURE: 0.3% MAX FREE

AMMONIA: 160 PXT PPM MAXIMUM

BIURET: 1% MAXIMUM

HARMFUL SUBSTANCES: 100% FREE FROM HARMFUL SUBSTANCES

MELTING POINT: 132 DEGREES CELSIUS

GRANULATION: 1-4 MM 94% MINIMUM

COLOUR: PURE WHITE PRILLED:

FREE FLOWING, TREATED AGAINST CAKING

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