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A Comparison of the Use of Azolla and Blue-green Algal Bio-fertilizers with Green Manuring, Organic Manuring and Urea in Transplanted and Direct-seeded Rice

Published online by Cambridge University Press:  03 October 2008

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

Azolla and blue-green algae (BGA) inoculated in a rice field produced a higher biomass and fixed more nitrogen in transplanted than in direct-seeded rice. Application of Azolla, BGA, composts of Eichhomia and Azolla and green manuring with Sesbania increased tiller numbers, height, grain and straw yields, and nitrogen uptake by rice in both the transplanted and the direct-seeded crop. The growing and incorporating of three Azolla crops with the rice crop produced more grain than the use of other nitrogen sources but the rice crops showed a poor response to inoculation with BGA. The yield of rice following green manuring with Sesbania or the use of two crops of Azolla after transplanting was similar to that of a crop receiving 60 kg N ha−1 as urea, but smaller yields resulted from the use of composts of Azolla and Eichhornia.

Type
Research Article
Information
Experimental Agriculture , Volume 25 , Issue 4 , October 1989 , pp. 485 - 491
Copyright
Copyright © Cambridge University Press 1989

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References

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