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Release of Nitrogen from Sulfur-coated Urea in Flooded Soil¹

Laboratory and greenhouse experiments were conducted to investigate the release of N in Mountview sil from sulfur-coated urea (SCU) and the subsequent uptake of N by rice (Oryza sativa L. var. ‘Nato’). The rate of N release was much greater in moist than in flooded soil. Granules of SCU became coated with FeS after 2 weeks in flooded soil. When the flooded soil was dried to about field capacity, oxidation of the FeS coatings appeared to seal the granules so that very little N was released. In general, the release of N was slightly greater fram SCU applied to limed soils fertilized with P

Dry matter production and uptake of N by rice from SCU was similar to that from uncoated urea when both N sources were incubated in moist soil for at least 2 weeks prior to planting and flooding. Urea applied to the soil immediately before flooding was also effective, but SCU was not.

Key Words: Soil pH • Soil moisture • Phosphorus placement • Oryza sativa • Slow-release N fertilizer

² Research Soil Chemists.

Received for publication February 9, 1970.