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Decomposition of Urea Phosphate in Soils¹

ABSTRACT

Studies of the decomposition of urea phosphate (NH₂CO-NH₂ · H₃PO₄) in soils showed that the phosphoric acid in this compound retards enzymatic hydrolysis of the urea by soil urease and reduces gaseous loss of urea N as ammonia. When soils treated with urea and urea phosphate were incubated at 20C for 14 days, the percentage loss of urea N as ammonia was 4.6–61.1% (average, 21.2%) for the soils treated with urea, but was only 0.1–1.1% (average, 0.7%) for the soils treated with urea phosphate. The studies reported support the conclusion from previous work that urea phosphate has significant potential advantages over urea as a fertilizer.

¹ Journal paper no. J-6820 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. Projects 1835 and 1845. This work was supported in part by TVA.

² Professor and Research Associate, respectively, Department of Agronomy, Iowa State University, Ames.

Received for publication January 13, 1971. Accepted for publication February 26, 1971.