Influence of carbon substrates and moisture regime on nitrogen fixation in paddy soils |
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Authors: | P.B.B.N. Charyulu V.Rajaramamohan Rao |
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Affiliation: | Laboratory of Soil Microbiology, Central Rice Research Institute, Cuttack 753006, India |
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Abstract: | The influence of several carbon sources on heterotrophic N2 fixation in four paddy soils under flooded and nonflooded conditions was investigated by 15N-tracer technique. Greater N2 fixation occurred in submerged soils amended with cellulose and rice straw, the former being superior. Addition of sucrose, glucose and malate in that order stimulated N2 fixation in submerged alluvial soil, while sucrose alone enhanced N3 fixation in laterite soil. In submerged acid soils none of these C sources stimulated N2 fixation. Nonflooded conditions favoured N2 fixation in alluvial and acid saline soils amended with cellulose, sucrose and glucose. |
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