Azolla is used as biofertilizer as it has

How do biofertilisers enrich the fertility of the soil?

Nitrogen fixation is

Which of the following is used as biofertiliser?

$I.$ Cyanobacteria

$II.$ Yeast

$III.$ Symbiotic bacteria

$IV.$ Free living bacteria

Choose the correct option

Which one of the following is not used in organic farming?

Which is correct about nitrogen fixation by legumes. They fix nitrogen through