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The Use of Urea and Sulfur-Coated Urea for Corn Production in a Tropical Soil¹

ABSTRACT

Placement of applied N at surface and at the 5-cm depth at the rates of 50, 100, and 200 kg/ha of urea and sulfur-coated urea (SCU) were used to measure changes in grain yield and N uptake by corn (Zea mays L.) grown during the wet season in Trinidad. SCU performed better than urea. Surface applied SCU was more efficient than when placed at 5 cm depth. Urea placed at 5 cm depth was more efficient in corn production than when applied on the surface.

¹ Contribution from the Univ. of the West Indies, St. Augustine, Trinidad.

² Soil Chemist, Dept. of Soil Science.

Received for publication May 27, 1975. Accepted for publication July 4, 1975.