Which one of the following is not a biofertiliser?
Agrobacterium
Rhizobium
Nostoc
Mycorrhiza
Which of the following cyanobacteria can fix atmospheric nitrogen?
$I.$ Anabaena
$II.$ Oscillatoria
$III.$ Nostoc
Choose the correct option
Biofertilizers include
The common nitrogenfixer in paddy fields is
Biofertilisers
The best fertilizer for paddy is