The common biofertiliser used in organic farming is:

Margosa

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Pyrethrum

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Cyanobacteria

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Nitrogen-fixing bacteria

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Solution

The correct option is D
Nitrogen-fixing bacteria

The common biofertiliser used in organic farming is cyanobacteria and nitrogen-fixing rhizobium. Both these microbes fix the atmospheric nitrogen and increase the soil fertility naturally. Margosa is neem plant, which is mostly used as a biopesticide and not as biofertiliser. Pyrethrum is a plant (Chrysanthemum) and is applied to the skin as an insecticide to remove head lice, mites, etc.

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