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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.
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Urea
Phosphate