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Nitrogen fixation (C2H2 reduction) as influenced by sulphate in paddy soils

Published online by Cambridge University Press:  27 March 2009

J. L. N. Rao
Affiliation:
Division of Soil Science and Microbiology, Central Rice Research Institute, Cuttack 753006, India
V. Bajaramamohan Rao
Affiliation:
Division of Soil Science and Microbiology, Central Rice Research Institute, Cuttack 753006, India

Summary

The influence of addition of sulphate on acetylene reduction in three paddy soils differing in their properties under two water regimes was investigated in a laboratory experiment. Nitrogenase activity was high in a P-deficient alkaline soil and addition of sulphate further enhanced the activity under two water regimes, with a pronounced stimulation under non-flooded conditions. Sulphate application to submerged alluvial soil enhanced nitrogenase activity with no apparent effect under non-flooded conditions. In acid sulphate saline Pokkali soil sulphate addition had little effect on the nitrogenase activity. Sulphate addition did not result in significant changes in the soil pH and redox potential. No relationship seemed to exist between the sulphate disappearance and stimulation of nitrogenase in these soils. A differential stimulation of N2-fixing microorganisms was noticed as a result of sulphate application. Results suggest that sulphate-induced stimulation of nitrogenase activity occurs in non-flooded soils.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1986

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