Organic forming does not include
Green manures
Chemical fertilizer
Crop rotation
Compost and farmyard manures
The main sources of biofertilisers are
$(a)$ Bacteria
$(b)$ Cyanobacteria
$(c)$ Fungi
$(d)$ Protists
Which of the following groups of plants are highly useful in increasing soil fertility
Nitrogen fixation is
Farmers have reported over $50\%$ higher yields of rice by using which of the following biofertilizer