Farmers have reported $50\%$ higher yield of rice by using biofertilizer
Azolla pinnata
Legume-Rhizobium symbiosis
Cyanobacteria
Mycorrhiza
How do mycorrhizal fungi help the plants harbouring them ?
How do biofertilisers enrich the fertility of the soil?
Consider the following statements about organic farming
$I.$ Organic farming promotes the use of crop rotations and cover crops and encourages balanced host/predator relationships
$II.$ Integrated pest and weed management and soil conservation systems are valuable tools on an organic farm
$III.$ Organic farming protects the environment, minimize soil degradation and erosion and decrease pollution
Which of the statements given above are correct?
Some blue green algae can be used as biofertilizer as they are
What are biofertilizers ? Give two examples.