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Gaseous Loss of Nitrogen in Paddy Soils
Author(s) -
Hanif M.,
DeMooy C. J.
Publication year - 1987
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1987.tb00264.x
Subject(s) - irrigation , agronomy , environmental science , fertilizer , nitrogen , oryza sativa , greenhouse , flooding (psychology) , soil water , human fertilization , chemistry , biology , soil science , psychology , biochemistry , organic chemistry , psychotherapist , gene
Irrigation practices for rice ( Oryza sativa ) that are common in South Asia were simulated under greenhouse conditions, and the resulting range of gaseous N losses was determined. The interaction of water and fertilizer management for growing paddy rice was quantitatively evaluated at several rates of N fertilization. Continuous flooding, alternate flooding and drying, and dry periods before, after, and during flowering were combined with 3 rates of N, i.e., 0, 50, and 100 mg kg −1 by uniform incorporation and by mud ball placement. Gaseous loss of native soil N was small (10 mg kg −1 ) when no fertilizer was applied and the crop stand was adequate. Loss increased to 32 mg kg −1 when stands were halved. Gaseous loss of 41 to 58% were found when fertilizer was applied. Alternate flooding and drying was the least desirable irrigation practice with losses of 40 to 87 mg N kg −1 . Placement of N in mud balls reduced gaseous N loss under all irrigation procedures by 14 to 32% compared to uniform application at the low N application rate. Under continuous flooding only 28% of a second increment of 50 mg kg −1 of applied N was lost compared to 82% loss with alternate flooding and drying.