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    • Keywords


      Rice soils; facultative symbiotrophic associations; acid sulphate soil; nitrogen fixation; nitrogen-fixing efficiency

    • Abstract


      The occurrence of facultative symbiotrophic N2-fixing associations in three rice soils of India is reported. Considerable variation in N2-fixing efficiency of these associations was noticed among the soil types studied. Associations from rice straw-amended alluvial soil under both flooded and non-flooded conditions exhibited higher N.-fixing efficiency than those from unamended soils of both water regimes. Despite high salinity and acidity an acid sulphate soil harboured N.-fixing symbiotrophic organisms with appreciable efficiency. Application of rice straw to the soil under both flooded and non-flooded conditions stimulated N2-fixation in alluvial, laterite and acid sulphate saline soils. These observations suggested the significant contribution of these associations to the nitrogen economy of different soil types.

    • Author Affiliations


      P B B N Charyulu1 C Ramakrishna1 V Rajaramamohan Rao1

      1. Laboratory of Soil Microbiology, Central Rice Research Institute, Cuttack - 753 006
    • Dates


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