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This article in SSSAJ

  1. Vol. 30 No. 2, p. 278-281
    Received: Sept 10, 1965
    Accepted: Jan 12, 1966

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Evaluation of Ureaform Fertilizer Using Nitrogen-15-Labeled Materials in Sandy Soils1

  1. M. A. Brown and
  2. G. M. Volk2



A quantitative account of labeled ureaform and ammonium nitrate fertilizer N was made in outdoor lysimeters, greenhouse pots, and laboratory incubation vessels. A major portion of the labeled fertilizer N applied to lysimeter and greenhouse pots was recovered by crops. A greater proportion of labeled ammonium nitrate N was recovered in the plants than labeled ureaform N. However, more labeled N was found in the soil after 1 year when ureaform was the source. As a result, there were no differences in total recovery of labeled N in plants plus soil between sources. Approximately half of the N in the ureaform used in these studies was in a state of availability approaching that of ammonium nitrate. Extended availability of ureaform N over ammonium nitrate N was only apparent at the high rate of ureaform application. Approximately 15 to 20% of the ureaform material remained apparently unchanged in the soil after 1 year.

Unaccounted for N is thought to have been lost as a gas after it entered the organic N complex of the soil, since similar total recoveries were obtained for ammonium, nitrate, and ureaform N. Under anaerobic conditions significant quantities of N were lost from soils incubated with ureaform as well as from soils incubated with ammonium nitrate.

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