The common nitrogenfixer in paddy fields is
Rhizobium
Azospirillum
Oscillatoria
Frankia.
Which of the following is free living aerobic and nonphotosynthetic nitrogen fixing bacterium
What would happen if oxygen availability to activated sludge flocs is reduced ?
$VAM$ represents
Identify correct option for micorrhiza
$(1)$ Many members of the genus glomusinvolved micorrhiza
$(2)$ It is responsible for all mineralsabsorption from the soil
$(3)$ Such associations show benefitsagainst draught and salinity in plants
$(4)$ Micorrhiza is a symbiotic relation ofalgae and plants
The main sources of biofertilisers are