Discussion
Blue-green algae used as a biofertiliser in rice fields contribute mainly by
Answer: C
Correct answer: Fixing atmospheric nitrogen in the flooded field
The cyanobacteria used in rice paddies - Anabaena, Nostoc and their relatives, often in symbiosis with the water fern Azolla - fix atmospheric nitrogen in their heterocysts and release it to the water and soil as they die and decompose. A flooded field suits them because they are photosynthetic and need standing water, and the contribution can amount to several tens of kilograms of nitrogen per hectare per season.
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