In the soil which nutrient is enriched by blue green algae
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Nitrogen fixed by cyanobacteria is released either through exudation or through microbial decomposition after the alga dies. In paddy fields, the death of algal biomass is most frequently associated with soil dessication at the end of the cultivation cycle and algal growth has frequently resulted in a gradual build up of soil fertility with a residual effect on succeeding crop also. The BGA inoculum (Nostoc, Anabaena, Westiellopsis, Aulosira and Scytonema) was used after rice transplantation. After rice harvest, the soil nitrogen was then estimated.
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Answer:atmosphericnitrogen
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