A water fern, which is used as a green manure in rice fields is
Salvinia
Mucor
Aspergillus
Azolla
The chemical fertilizer required for better rhizobial nitrogen fixation is
Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer
Azolla is used as a biofertilizer because it
Organic forming is the technique of raising crops through use of
Azotobacter and Bacillus polymyxa are