Abstract
Nitrification associated with the various components [subsurface soil from unplanted and planted (rhizosphere) fields, standing water and surface soil from planted and unplanted fields and leaf sheath suspensions] of submerged rice paddies was examined in incubation experiments with solutions inoculated with soil or water samples. Substantial nitrification occurred in all samples, standing water and surface soil samples in particular, during their 40-day incubation with NH +4 −N. Almost all the NH +4 −N, disappeared during incubation with standing water, was recovered as NO sup-inf3 −N. This, compared to 70–80% from all soil samples and only 29% from leaf sheath suspensions. Significant loss of nitrogen, especially from leaf sheath suspensions, is probably due to nitrification-denitrification as evidenced by its complete recovery in the presence of N-Serve. Nitrification potential of the soil and water samples varied with the crop growth stage and was more pronounced at tillering and panicle inititation stages than at other stages. Nitrification potential of samples from green-manure-amended plots was distinctly less than that of samples from control and urea-amended plots. Most probable number (MPN) estimates of ammonium-oxidizing bacteria were always higher in surface soil in both planted and unplanted plots at all stages of crop growth.
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Dedicated to Professor J. C. G. Ottow on the occasion of his 60th birthday
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Adhya, T.K., Patnaik, P., Rao, V.R. et al. Nitrification of ammonium in different components of a flooded rice soil system. Biol Fertil Soils 23, 321–326 (1996). https://doi.org/10.1007/BF00335961
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DOI: https://doi.org/10.1007/BF00335961