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Release of Nitrogen from Sulfur‐coated Urea in Flooded Soil 1
Author(s) -
Giordano P. M.,
Mortvedt J. J.
Publication year - 1970
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1970.00021962006200050017x
Subject(s) - urea , coated urea , sulfur , nitrogen , soil water , chemistry , agronomy , oryza sativa , sowing , paddy field , organic matter , dry matter , zoology , environmental chemistry , environmental science , soil science , biology , biochemistry , gene , organic chemistry
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 from 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.