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Published in Soil Sci Soc Am J 50:226-229 (1986)
© 1986 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Nitrogen Release from Urea and Sulfur-coated Urea in Jack Pine Forest Humus1

N. W. Foster and E. G. Beauchamp2

ABSTRACT

Urea and sulfur-coated urea (SU) were each applied in the spring at a rate equivalent to 200 kg N ha–1 to a separate set of replicated 1-m2 plots in a 50-yr-old boreal jack pine (Pinus banksiana Lamb.) forest. Fertilizer N recovery in L, F, and H horizons was determined periodically over 4 yr. Urea was completely hydrolyzed in soil within 10 d, whereas incompletely dissolved SU pellets, containing N equivalent to approximately 10% of the amount added, were recovered from the humus horizons 447 d after fertilization. In urea-treated humus, NH+4-N concentrations significantly greater than those in controls were observed for 57 d. In SU-treated humus, NH+4-N concentrations significantly greater than those in a control were maintained for 477, 336, and 115 d in L, F, and H horizons, respectively. Initial (3 d) NH3 volatilization from SU-treated soil was only 17% of that observed in the urea treatment, presumably because slower release from SU granules resulted in lowere initial pH increases in L and F horizons.

NOTES

1 Contribution from the Government of Canada, Canadian Forestry Service, Great Lakes Forestry Centre, Sault Ste. Marie, Ontario. Presented before Div. S-7, at the Soil Science Society of America meeting, Washington, DC., on 15 Aug. 1983.

2 Research Scientist, Great Lakes Forestry Centre and Professor, Univ. of Guelph, respectively.

Received for publication March 25, 1985. Accepted for publication August 2, 1985.






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