The Azolla-Anabaena complex and its use in rice culture

Watanabe, I. and Bai, K.Z. and Berja, N.S. and et al, . (1981) The Azolla-Anabaena complex and its use in rice culture. Other. International Rice Research Institute, Los Banos, Laguna, Philippines.

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Abstract

More than 50 strains of 5 azolla species, collected from all over the world, are maintained at IRRI. Screening for high temperature-tolerant strains was done in growth chambers and in the field. No strain was satisfactorily tolerant of high temperature in the dry season. Preliminary studies on the conditions needed for azolla sporulation were made. Differences in azolla's growth with limited phosphorus nutrition were observed among strains and species. The mineralization rate of nitrogen fixed by the Azolla-Anabaena complex also differed among species and strains. Azolla can supply 70 kg N/ha when grown 4-6 times/rice crop. That nitrogen promotes rice yields comparable to that obtained by 70-100 kg chemical fertilizer

Item Type:	Monograph (Other)
Author Affiliation:	Soil Microbiologist, International Rice Research Institute, Los Banos, Laguna, Philippines
Subjects:	Soil Science and Microbiology > Soil Sciences
Divisions:	Other Crops
Depositing User:	Ms K Syamalamba
Date Deposited:	08 Nov 2012 05:38
Last Modified:	08 Nov 2012 05:38
URI:	http://eprints.icrisat.ac.in/id/eprint/8697

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