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Dissolution of Sulfur-Coated Urea in Soil: I. Wax-Sealed Sulfur-Coated Urea¹

ABSTRACT

The release of urea from three wax-sealed, sulfur-coated urea (SCU) samples was tested in a laboratory soil system. These samples were of nearly matched 7-day dissolution values but had different amounts of total coatings. Soil-SCU mixtures were incubated for varying times up to 18 weeks at different temperatures, pH (liming), and microbial (sucrose) levels. The release of urea from all samples increased markedly with increasing temperature but only slightly with increasing pH or microbial levels. Their time-release patterns were different in spite of their similar 7-day dissolution test values.

¹ Contribution from the Fundamental Res. Branch, Div. of Chemical Development, TVA, Muscle Shoals, AL 35660.

² Research Chemists.

Received for publication May 14, 1979. Accepted for publication August 10, 1979.