The aquatic fern, which is an excellent
biofertiliser is
(a) Azolla (b) Salvinia
(c) Marsilia (d) Pteridium
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Answer:
a) Azolla
Explanation:
Azolla pinnata (aquatic fern) is a symbiotic nitrogen fixing cyanobacteria which is inoculated in rice fields in south-eastern Asia, and found to increase yield upto 50%.
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