Cottonseed meal, blood meal, fish emulsion, manure and sewage sludge are examples of:

Organic fertilisers

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Chemical fertilisers

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Artificial fertilisers

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(b) and (c) above

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Solution

The correct option is A Organic fertilisers
$∙$ Cottonseed meal, blood meal, fish emulsion, manure and sewage sludge are examples of organic fertilisers. They are also known as compost or bio-fertilisers.
$∙$ Use of chemicals damages the soil fertility. Hence, farmers use bio-fertilisers instead of chemical fertilisers and synthetic pyrithroids to get a higher yield in organic farming.

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