Urea phosphate
Names

IUPAC name phosphoric acid;urea
Identifiers
CAS Number	4401-74-5 4861-19-2
3D model (JSmol)	Interactive image
ChemSpider	19748
ECHA InfoCard	100.023.149
EC Number	225-464-3
PubChem CID	20994
UNII	TJR09610O7
CompTox Dashboard (EPA)	DTXSID3063627
InChI InChI=1S/CH4N2O.H3O4P/c2-1(3)4;1-5(2,3)4/h(H4,2,3,4);(H3,1,2,3,4) Key: DZHMRSPXDUUJER-UHFFFAOYSA-N
SMILES C(=O)(N)N.OP(=O)(O)O
Properties
Chemical formula	CH₇N₂O₅P
Molar mass	158.050 g·mol⁻¹
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Urea phosphate is a 1:1 combination of urea and phosphoric acid that is used as a fertilizer. It has an NPK formula 17-44-0, and is soluble in water, producing a strongly acidic solution.

Urea phosphate is available in fertilizer vendor bags that carry a UP signet on the packaging. It is sometimes added to blends which contain calcium nitrate, magnesium nitrate and potassium nitrate to produce water-soluble formulas such as 15-5-15 and 13-2-20. The acidity of urea phosphate allows Ca, Mg and P to co-exist in solution. Under less acidic conditions, there would be precipitation of Ca–Mg phosphates. Urea phosphate is often used in drip irrigation to clean pipe systems.

The phosphoric acid and urea molecules in the urea phosphate crystal structure form a complex hydrogen-bonding network.^[1] It freely dissociates when dissolved in water.

References