Upasana Mishra and
 Sunil Pabbi are at
Centre for Conservation and Utilisation of Blue-Green Algae,
Indian Agricultural Research Institute,
New Delhi .

Application of high input technologies has resulted in significant increase in agricultural productivity. There is, however, a growing concern about the adverse effects of indiscriminate use of chemical fertilizers on soil productivity and environmental quality. Cyanobacteria offer an economically attractive and ecologically sound alternative to chemical fertilizers for realizing the ultimate goal of increased productivity, especially in rice cultivation. In a wetland rice ecosystem, nitrogen fixation by free living cyanobacteria also significantly supplements soil nitrogen.

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Address for Correspondence
Upasana Mishra and
 Sunil Pabbi
Centre for Conservation and Utilisation of Blue-Green Algae
Indian Agricultural Research Institute
New Delhi 110 012, India.
Email:psunil11@hotmail.com
sunilpabbi@eudoramail.com