Release of Nitrogen from Sulfur-coated Urea in Flooded Soil1
- P. M. Giordano and
- J. J. Mortvedt2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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