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The Use of Azolla Pinnata Isolates as Organic Nitrogen Sources for Lowland Rice (Oryza Sativa)

Published online by Cambridge University Press:  03 October 2008

A. L. Singh  and
P. K. Singh
A. L. Singh
Affiliation:
Blue Green Algal Laboratory, Central Rice Research Institute, Cuttack 753 006, India
P. K. Singh
Affiliation:
Blue Green Algal Laboratory, Central Rice Research Institute, Cuttack 753 006, India
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Summary

Four isolates of Azolla pinnata collected from Bangkok, Bangladesh, Vietnam and India grew well when used in paddy fields both before and after transplanting with rice varieties of different heights and times to maturity. Azolla increased plant height, tillering, 1000-grain weight, grain and straw yields, nitrogen concentration and uptake, and soil fertility.

The response of rice to Azolla was similar to that obtained by applying 60 kg N ha−1 as urea in three split applications. The different Azolla isolates differed in their growth, N2-fixation and response to rice crops and soil fertility. All these characteristics were better in the isolates from Bangkok and Vietnam than in those from Bangladesh and India. Azolla growth and N2-fixation were better with short rice varieties (IR-36, Ratna and Kalinga-II) than with Mahsuri, a tall rice variety, but Mahsuri, having a longer growing season, showed a better response to Azolla.

Type
Research Article
Information
Experimental Agriculture , Volume 23 , Issue 2 , April 1987 , pp. 159 - 166
Copyright
Copyright © Cambridge University Press 1987

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References

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