Question

Describe the role of blue green algae in fertility of soil .

Answer 1

1. Blue green algae can fix free nitrogen of atmosphere and increase the fertility of the soil.
2. Nostoc, anabaena and oscillatoria are example of blue- green algae.
3. Algae also increases the fertility of barren fields by increasing nitrogen content and humus content of the soil.
4. Due to this the water holding capacity of soil is improved.