title: Dynamics of changes in methanogenesis and associated microflora in a flooded alluvial soil following repeated application of dicyandiamide, a nitrification inhibitor.
abstract: Influence of repeated application of the nitrification inhibitor dicyandiamide (DCD), on CH(4) production and associated microflora in a flooded alluvial soil, was investigated in a laboratory incubation study. Application of DCD at the time of soil incubation resulted in a substantial reduction in CH(4) production (31% over that of untreated control). Second repeat application of DCD, on the contrary, annulled the inhibitory effect on CH(4) production, restoring it to the level of unamended soil. Application of the third dose of DCD maintained CH(4) production almost to the same extent as that of second application. The alleviation of the initial inhibitory effect of DCD on CH(4) production was linked to the enhanced degradation of DCD following its repeated application to the flooded soil. Admittedly, abatement of the initial inhibitory effect of DCD on CH(4) production in soil repeatedly amended with DCD was also related to the inhibition of CH(4)-oxidizing bacterial population and noticeable stimulation of heterotrophic bacterial population. Results suggest that repeat application of DCD with fertilizer-N to flooded rice soils might not be effective in controlling CH(4) production under field condition.
authors.affiliation: Laboratory of Soil Microbiology, Division of Soil Science and Microbiology, Central Rice Research Institute, Cuttack 753006, Orissa, India.
authors.forename: S R
authors.initials: SR
authors.lastname: Mohanty
authors.forename: K
authors.initials: K
authors.lastname: Bharati
authors.forename: V R
authors.initials: VR
authors.lastname: Rao
authors.forename: T K
authors.initials: TK
authors.lastname: Adhya
mesh_terms: D000693:Anaerobiosis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism*; D003958:Diamide / Q000494:pharmacology*; D005308:Fertilizers / Q000032:analysis; D055868:Floods; D008697:Methane / Q000378:metabolism*; D009573:Nitrites / Q000037:antagonists & inhibitors* / Q000378:metabolism; D012988:Soil Microbiology
chemical_list: D005308:Fertilizers; D009573:Nitrites; D003958:Diamide; D008697:Methane