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Determination of dinitrogen emission and retention in floodwater and porewater of a lowland rice field fertilized with 15 N-urea[J] . A. R. Mosier,S. L. Chapman,J. R. Freney.Fertilizer Research . 1989 (3)
[3]
Nitrogen losses from labelled ammonium sulphate and Urea applied to a flooded rice soil[J] . C Stanley Weeraratna,ET Craswell.Fertilizer Research . 1985 (3)