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Rhizosphere soil nitrogenase (C2H2 reduction) as influenced by the nitrogen management in intermediate deep water rice

Published online by Cambridge University Press:  27 March 2009

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

In a field experiment, the influence of different forms and methods of application of urea nitrogen on the rice rhizosphere soil nitrogenase was evaluated under simulated intermediate deep water situations. Nitrogenase was high when the soil received small amounts of nitrogen and phosphorus with a water level of 20–25 cm. Moreover, during and after the flash floods the nitrogenase activity was considerably increased. There was a significant reduction in the nitrogenase activity when the nitrogen was applied to the shallow water through urea briquettes, but when it was applied either behind the plough or between the rows, the activity was stimulated. Increased water level of about 50 cm for prolonged periods considerably reduced the nitrogenase activity. Results indicate that the method of application of urea nitrogen and the water level influenced the rhizosphere soil nitrogenase activity under intermediate deep water situations.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 101 , Issue 3 , December 1983 , pp. 547 - 551
Copyright
Copyright © Cambridge University Press 1983

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