Nitrogen Use Efficiency, Nitrogen Fertilizers, NUE, Nitrogen and the EnvironmentUrea Phosphate
Nitrogen Use Efficiency

Nutrient Content, %

Source N P2O5 K2O CaO MgO S Cl Form Cost/lb N
Urea phosphate 17 43-44           solid  

From Havlin, Beaton, Tisdale and Nelson (1999)

Urea phosphate CO(NH2)2H3PO4 is a crystalline product formed by the reaction of urea with orthophosphoric acid. The common grade is 17-44-0, which is primarily used to produce other grades of lower analysis. Urea phosphates with lower purity standards may be adequate for production of suspension fertilizers and for fertigation. Urea has also been combined with (NH4)2HP04 into a solid 28-28-0. Granular urea sulfate with grades ranging from 40-0-0-4 to 30-0-0-13 have been produced. The N/S ratio in this product may vary from 3:1 to 7: 1, thus providing enough scope to correct N and S deficiencies in most soils. Although numerous urea-based fertilizers have been produced in pilot plants, they are not commonly used in North America.