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This article in SSSAJ

  1. Vol. 35 No. 4, p. 575-578
    Received: Jan 13, 1971



Decomposition of Urea Phosphate in Soils1

  1. J. M. Bremner and
  2. L. A. Douglas2



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.

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